#include <iostream>
#include <vector>
#include <map>
#include <set>
#include <cmath>
#include <algorithm>

using namespace std;

struct Line {
int x1, y1, x2, y2;
};
int countCells(Line line, pair<int, int> star, bool split) {
if (line.x1 == line.x2) {
if (split) {
return min(abs(star.second - line.y1), abs(star.second - line.y2)) + 1;
}
else {
return abs(line.y1 - line.y2) + 1;
}
}
else {
if (split) {
return min(abs(star.first - line.x1), abs(star.first - line.x2)) + 1;
}
else {
return abs(line.x1 - line.x2) + 1;
}
}
}
bool intersects(Line a, Line b, pair<int, int>& intersection) {
if (a.x1 == a.x2 && b.y1 == b.y2) {
if (b.x1 <= a.x1 && a.x1 <= b.x2 && a.y1 <= b.y1 && b.y1 <= a.y2) {
intersection = {a.x1, b.y1};
return true;
}
}
if (a.y1 == a.y2 && b.x1 == b.x2) {
if (a.x1 <= b.x1 && b.x1 <= a.x2 && b.y1 <= a.y1 && a.y1 <= b.y2) {
intersection = {b.x1, a.y1};
return true;
}
}
return false;
}
int main() {
int N, K;
cin >> N;
vector<Line> lines(N);
for (int i = 0; i < N; ++i) {
cin >> lines[i].x1 >> lines[i].y1 >> lines[i].x2 >> lines[i].y2;
if (lines[i].x1 > lines[i].x2 || (lines[i].x1 == lines[i].x2 && lines[i].y1 > lines[i].y2)) {
swap(lines[i].x1, lines[i].x2);
swap(lines[i].y1, lines[i].y2);
}
}
cin >> K;
map<pair<int, int>, vector<Line>> stars;
for (int i = 0; i < N; ++i) {
for (int j = i + 1; j < N; ++j) {
pair<int, int> intersection;
if (intersects(lines[i], lines[j], intersection)) {
stars[intersection].push_back(lines[i]);
stars[intersection].push_back(lines[j]);
}
}
}

int asiylam = 0;
for (auto& star : stars) {
if (star.second.size() / 2 == K) {
vector<int> intensities;
for (auto& line : star.second) {
intensities.push_back(countCells(line, star.first, true));
}
asiylam += *min_element(intensities.begin(), intensities.end());
}
}
cout << asiylam << endl;
return 0;
}

Magic Star Intensity Code
C++
TCS Exam

https://t.me/coding_solution_help

#include <iostream>
#include <vector>
#include <map>
#include <set>
#include <cmath>
#include <algorithm>

using namespace std;

struct Line {
int x1, y1, x2, y2;
};
int countCells(Line line, pair<int, int> star, bool split) {
if (line.x1 == line.x2) {
if (split) {
return min(abs(star.second - line.y1), abs(star.second - line.y2)) + 1;
}
else {
return abs(line.y1 - line.y2) + 1;
}
}
else {
if (split) {
return min(abs(star.first - line.x1), abs(star.first - line.x2)) + 1;
}
else {
return abs(line.x1 - line.x2) + 1;
}
}
}
bool intersects(Line a, Line b, pair<int, int>& intersection) {
if (a.x1 == a.x2 && b.y1 == b.y2) {
if (b.x1 <= a.x1 && a.x1 <= b.x2 && a.y1 <= b.y1 && b.y1 <= a.y2) {
intersection = {a.x1, b.y1};
return true;
}
}
if (a.y1 == a.y2 && b.x1 == b.x2) {
if (a.x1 <= b.x1 && b.x1 <= a.x2 && b.y1 <= a.y1 && a.y1 <= b.y2) {
intersection = {b.x1, a.y1};
return true;
}
}
return false;
}
int main() {
int N, K;
cin >> N;
vector<Line> lines(N);
for (int i = 0; i < N; ++i) {
cin >> lines[i].x1 >> lines[i].y1 >> lines[i].x2 >> lines[i].y2;
if (lines[i].x1 > lines[i].x2 || (lines[i].x1 == lines[i].x2 && lines[i].y1 > lines[i].y2)) {
swap(lines[i].x1, lines[i].x2);
swap(lines[i].y1, lines[i].y2);
}
}
cin >> K;
map<pair<int, int>, vector<Line>> stars;
for (int i = 0; i < N; ++i) {
for (int j = i + 1; j < N; ++j) {
pair<int, int> intersection;
if (intersects(lines[i], lines[j], intersection)) {
stars[intersection].push_back(lines[i]);
stars[intersection].push_back(lines[j]);
}
}
}

int asiylam = 0;
for (auto& star : stars) {
if (star.second.size() / 2 == K) {
vector<int> intensities;
for (auto& line : star.second) {
intensities.push_back(countCells(line, star.first, true));
}
asiylam += *min_element(intensities.begin(), intensities.end());
}
}
cout << asiylam << endl;
return 0;
}

Magic Star Intensity Code
C++
TCS Exam

https://t.me/coding_solution_help

int main() {
string s;
cin >> s;
int n = s.length(), res = 0;
vector<int> v(n);
for (int i = 0; i < n; ++i) cin >> v[i];
int lw = s[0] - '0', lwv = v[0];
for (int i = 1; i < n; ++i) {
if (s[i] - '0' == lw) {
res += min(lwv, v[i]);
lwv = max(lwv, v[i]);
} else {
lw = s[i] - '0';
lwv = v[i];
}
}
cout << res;
return 0;
}
Form alternating string

Change accordingly before submitting to avoid plagiarism

#include <bits/stdc++.h>
using namespace std;

int main() {
int x, y;
cin >> x >> y;
vector<vector<int>> z(x, vector<int>(y));

for (int i = 0; i < x; ++i) {
for (int j = 0; j < y; ++j) {
cin >> z[i][j];
}
}

int w;
cin >> w;

map<int, vector<pair<int, int>>> a;
set<int> b;
for (int i = 0; i < x; ++i) {
for (int j = 0; j < y; ++j) {
int c = z[i][j];
a[c].emplace_back(i, j);
b.insert(c);
}
}

set<int> d;
for (int i = 0; i < x; ++i) {
vector<int> e;
for (int j = 0; j < y; ++j) {
if (z[i][j] == w) {
e.push_back(j);
}
}
if (!e.empty()) {
int f = *max_element(e.begin(), e.end());
for (int j = f + 1; j < y; ++j) {
int g = z[i][j];
if (g != w) {
d.insert(g);
}
}
}
}

set<int> h = b;
d.erase(w);
int i = 0;
for (auto j = d.begin(); j != d.end(); ++j) {
if (h.find(*j) != h.end()) {
h.erase(*j);
i++;
}
}

auto k = [&](const set<int>& l) -> set<int> {
set<int> m;
for (auto& n : l) {
for (auto& [o, p] : a[n]) {
if (o == x - 1) {
m.insert(n);
break;
}
}
}

queue<int> q;
for (auto& r : m) {
q.push(r);
}
while (!q.empty()) {
int s = q.front();
q.pop();
for (auto& t : l) {
if (m.find(t) != m.end()) continue;
bool u = false;
for (auto& [v, w] : a[t]) {
if (v + 1 < x) {
int x = z[v + 1][w];
if (m.find(x) != m.end()) {
u = true;
break;
}
}
}
if (u) {
m.insert(t);
q.push(t);
}
}
}
return m;
};

while (true) {
set<int> y = k(h);
set<int> z;
for (auto& aa : h) {
if (y.find(aa) == y.end()) {
z.insert(aa);
}
}
if (z.empty()) break;
for (auto& bb : z) {
h.erase(bb);
i++;
}
}

cout << i;

return 0;
}



Block Extraction - Codevita
Telegram

import java.util.*;

public class LoopMaster {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int numberOfCommands = Integer.parseInt(scanner.nextLine());
        List<String> commands = new ArrayList<>();
        for (int i = 0; i < numberOfCommands; i++) {
            commands.add(scanner.nextLine().trim());
        }
        processCommands(commands);
    }

    private static void processCommands(List<String> commands) {
        Stack<Integer> loopIterations = new Stack<>();
        Stack<Integer> currentIterations = new Stack<>();
        StringBuilder output = new StringBuilder();
        int commandIndex = 0;

        while (commandIndex < commands.size()) {
            String command = commands.get(commandIndex);
            if (command.startsWith("for")) {
                int times = Integer.parseInt(command.split(" ")[1]);
                loopIterations.push(times);
                currentIterations.push(0);
            } else if (command.equals("do")) {
                // No operation for "do"
            } else if (command.equals("done")) {
                int current = currentIterations.pop() + 1;
                int maxIterations = loopIterations.pop();
                if (current < maxIterations) {
                    loopIterations.push(maxIterations);
                    currentIterations.push(current);
                    commandIndex = findLoopStart(commands, commandIndex);
                    continue;
                }
            } else if (command.startsWith("break")) {
                int breakCondition = Integer.parseInt(command.split(" ")[1]);
                if (currentIterations.peek() + 1 == breakCondition) {
                    loopIterations.pop();
                    currentIterations.pop();
                    commandIndex = findLoopEnd(commands, commandIndex);
                }
            } else if (command.startsWith("continue")) {
                int continueCondition = Integer.parseInt(command.split(" ")[1]);
                if (currentIterations.peek() + 1 == continueCondition) {
                    int maxIterations = loopIterations.peek();
                    int current = currentIterations.pop() + 1;
                    if (current < maxIterations) {
                        currentIterations.push(current);
                        commandIndex = findLoopStart(commands, commandIndex);
                    }
                    continue;
                }
            } else if (command.startsWith("print")) {
                String message = command.substring(command.indexOf("\"") + 1, command.lastIndexOf("\""));
                output.append(message).append("\n");
            }
            commandIndex++;
        }
        System.out.print(output.toString());
    }

    private static int findLoopStart(List<String> commands, int currentIndex) {
        int nestedLoops = 0;
        for (int i = currentIndex - 1; i >= 0; i--) {
            if (commands.get(i).equals("done")) {
                nestedLoops++;
            } else if (commands.get(i).equals("do")) {
                if (nestedLoops == 0) {
                    return i;
                }
                nestedLoops--;
            }
        }
        return 0;
    }

    private static int findLoopEnd(List<String> commands, int currentIndex) {
        int nestedLoops = 0;
        for (int i = currentIndex + 1; i < commands.size(); i++) {
            if (commands.get(i).equals("do")) {
                nestedLoops++;
            } else if (commands.get(i).equals("done")) {
                if (nestedLoops == 0) {
                    return i;
                }
                nestedLoops--;
            }
        }
        return commands.size();
    }
}

Java
Loop Master - Codevita
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Plague 2050 
PYTHON


from collections import deque

def infected_neighbors_count(grid, a, b):
    n = len(grid)
    count = 0
    directions = [(-1, -1), (-1, 0), (-1, 1), (0, -1), (0, 1), (1, -1), (1, 0), (1, 1)]
    for i in range(len(directions)):
        dx, dy = directions[i]
        nx, ny = a + dx, b + dy
        if 0 <= nx < n and 0 <= ny < n and grid[nx][ny] == 1:
            count += 1
    return count

def infection_process(grid):
    n = len(grid)
    new_grid = [[grid[i][j] for j in range(n)] for i in range(n)]
    
    for i in range(n):
        for j in range(n):
            neighbors = infected_neighbors_count(grid, i, j)
            if grid[i][j] == 0 and neighbors == 3:
                new_grid[i][j] = 1
            elif grid[i][j] == 1 and (neighbors < 2 or neighbors > 3):
                new_grid[i][j] = 0
                
    return new_grid

def find_path(size, initial_grid):
    grid = [[1 if cell == '1' else 0 for cell in row] for row in initial_grid]
    start_x, start_y, end_x, end_y = -1, -1, -1, -1
    
    def set_positions():
        nonlocal start_x, start_y, end_x, end_y
        for i in range(size):
            for j in range(size):
                if initial_grid[i][j] == 's':
                    start_x, start_y = i, j
                    grid[i][j] = 0
                if initial_grid[i][j] == 'd':
                    end_x, end_y = i, j
                    grid[i][j] = 0
    
    set_positions()
    
    queue = deque([(start_x, start_y, grid, 0)])
    seen_states = set()
    
    while queue:
        x, y, current_grid, days = queue.popleft()
        
        if (x, y) == (end_x, end_y):
            return days
        
        state = (x, y, tuple(map(tuple, current_grid)))
        if state in seen_states:
            continue
        seen_states.add(state)
        
        next_grid = infection_process(current_grid)
        
        moves = [(0, 0), (-1, 0), (1, 0), (0, -1), (0, 1)]
        for dx, dy in moves:
            nx, ny = x + dx, y + dy
            if 0 <= nx < size and 0 <= ny < size and next_grid[nx][ny] == 0:
                queue.append((nx, ny, next_grid, days + 1))
    
    return -1

if name == "__main__":
    n = int(input())
    pollution_map = [input().strip() for _ in range(n)]
    print(find_path(n, pollution_map) + 1)

Python
Plague 2050 - Codevita
Telegram

MAXIMUM ROTATION
PYTHON


def rl(layer, pos, dir, ol):
    n = len(layer)
    rot = [None] * n

    if dir == "clockwise":
        for i in range(n):
            rot[(i + pos) % n] = layer[i]
    else:
        for i in range(n):
            rot[(i - pos) % n] = layer[i]

    for i in range(n):
        if ol:
            rot[i] = chr(((ord(rot[i]) - ord('A') - 1) % 26) + ord('A'))
        else:
            rot[i] = chr(((ord(rot[i]) - ord('A') + 1) % 26) + ord('A'))

    return rot


def aq(pl, row, col, size):
    layers = []
    for layer in range(size // 2):
        cl = []
        for j in range(col + layer, col + size - layer):
            cl.append(pl[row + layer][j])
        for i in range(row + layer + 1, row + size - layer - 1):
            cl.append(pl[i][col + size - layer - 1])
        for j in range(col + size - layer - 1, col + layer - 1, -1):
            cl.append(pl[row + size - layer - 1][j])
        for i in range(row + size - layer - 2, row + layer, -1):
            cl.append(pl[i][col + layer])
        layers.append(cl)

    for lidx, layer in enumerate(layers):
        ol = (lidx + 1) % 2 == 1
        dir = "counterclockwise" if ol else "clockwise"
        pos = lidx + 1
        rotated_layer = rl(layer, pos, dir, ol)

        idx = 0
        for j in range(col + lidx, col + size - lidx):
            pl[row + lidx][j] = rotated_layer[idx]
            idx += 1
        for i in range(row + lidx + 1, row + size - lidx - 1):
            pl[i][col + size - lidx - 1] = rotated_layer[idx]
            idx += 1
        for j in range(col + size - lidx - 1, col + lidx - 1, -1):
            pl[row + size - lidx - 1][j] = rotated_layer[idx]
            idx += 1
        for i in range(row + size - lidx - 2, row + lidx, -1):
            pl[i][col + lidx] = rotated_layer[idx]
            idx += 1

def MAX_ROTATION(n, pl, queries):
    for row, col, size in queries:
        aq(pl, row, col, size)
    result = ''.join(''.join(row) for row in pl)
    return result


n = int(input())
pl = [list(input().strip().split()) for _ in range(n)]
q = int(input().strip())
queries = [tuple(map(int, input().strip().split())) for _ in range(q)]

result = MAX_ROTATION(n, pl, queries)
print(result, end="")

Python
Maximum Rotation - Codevita
Telegram

#include <iostream>
#include <vector>
#include <set>
#include <cmath>
#include <map>
#include <algorithm>
using namespace std;

   polygon using the Shoelace Theorem
int calculateArea(const vector<pair<int, int>>& polygon) {
    int n = polygon.size();
    int area = 0;
    for (int i = 0; i < n; i++) {
        int j = (i + 1) % n;
        area += polygon[i].first * polygon[j].second;
        area -= polygon[j].first * polygon[i].second;
    }
    return abs(area) / 2;
}

 are connected
bool areConnected(pair<int, int> a, pair<int, int> b, pair<int, int>& p1, pair<int, int>& p2) {
    return (p1 == a && p2 == b) || (p1 == b && p2 == a);
}

int main() {
    int N;
    cin >> N;

    vector<pair<int, int>> coordinates;
    vector<vector<pair<int, int>>> segments(N);
    set<pair<int, int>> points;

 store them as pairs
    for (int i = 0; i < N; i++) {
        int x1, y1, x2, y2;
        cin >> x1 >> y1 >> x2 >> y2;
        coordinates.push_back({x1, y1});
        coordinates.push_back({x2, y2});
        points.insert({x1, y1});
        points.insert({x2, y2});
    }

    vector<pair<int, int>> polygon;
    int maxArea = 0;

      to form polygons
    for (auto p1 = points.begin(); p1 != points.end(); ++p1) {
        for (auto p2 = next(p1); p2 != points.end(); ++p2) {
            polygon.push_back(*p1);
            polygon.push_back(*p2);
            maxArea = max(maxArea, calculateArea(polygon));
        }
    }

    cout << maxArea << endl;
    return 0;
}

C++
Maximum Area - Codevita
Telegram

import java.util.*;

public class RitikaTask {

    private static int[] canFormWithDeletions(String sub, String mainStr, int maxDeletions) {
        int i = 0, j = 0, deletionsUsed = 0;
        while (i < mainStr.length() && j < sub.length()) {
            if (mainStr.charAt(i) == sub.charAt(j)) {
                i++;
                j++;
            } else {
                deletionsUsed++;
                if (deletionsUsed > maxDeletions) {
                    return new int[] {i, deletionsUsed};
                }
                i++;
            }
        }
        return new int[] {i, deletionsUsed};
    }

    private static boolean canMatchCharacter(char c, List<String> substrings) {
        for (String sub : substrings) {
            if (sub.indexOf(c) >= 0) {
                return true;
            }
        }
        return false;
    }

    public static String solveRitikaTask(List<String> substrings, String mainStr, int k) {
        int n = mainStr.length();
        int deletionsUsed = 0;
        StringBuilder formedString = new StringBuilder();
        boolean isAnyMatch = false;

        for (int i = 0; i < n; i++) {
            if (!canMatchCharacter(mainStr.charAt(i), substrings)) {
                return "Impossible";
            }
        }

        for (int i = 0; i < n;) {
            boolean matched = false;
            for (String sub : substrings) {
                int[] result = canFormWithDeletions(sub, mainStr.substring(i), k - deletionsUsed);
                int newIndex = result[0];
                int usedDeletions = result[1];

                if (newIndex > 0) {
                    matched = true;
                    isAnyMatch = true;
                    formedString.append(mainStr.substring(i, i + newIndex));
                    i += newIndex;
                    deletionsUsed += usedDeletions;
                    break;
                }
            }
            if (!matched) {
                break;
            }
        }

        if (formedString.length() == n) {
            if (deletionsUsed <= k) {
                return "Possible";
            } else {
                return formedString.toString().trim();
            }
        } else if (isAnyMatch) {
            return "Nothing";
        } else if (deletionsUsed > k) {
            return formedString.toString().trim();
        } else {
            return formedString.toString().trim();
        }
    }

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        int N = scanner.nextInt();
        scanner.nextLine();
        List<String> substrings = new ArrayList<>();
        for (int i = 0; i < N; i++) {
            substrings.add(scanner.nextLine());
        }

        String mainStr = scanner.nextLine();
        int K = scanner.nextInt();

        String result = solveRitikaTask(substrings, mainStr, K);
        System.out.print(result);

        scanner.close();
    }
}

Java
HELP RITIKA CODE
Telegram

#include <bits/stdc++.h>
using namespace std;

struct Point {
    int x, y;
};

int squaredDistance(const Point& a, const Point& b) {
    int dx = a.x - b.x;
    int dy = a.y - b.y;
    return dx * dx + dy * dy;
}

int main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    
    int N;
    cin >> N;
    vector<vector<int>> earringEdges(N, vector<int>());
    
    for(int i=0; i<N; i++){
        int K;
        cin >> K;
        vector<Point> points(K);
        for(int j=0; j<K; j++) cin >> points[j].x >> points[j].y;
        
        vector<int> edges;
        for(int j=0; j<K; j++){
            int next = (j+1) % K;
            edges.push_back(squaredDistance(points[j], points[next]));
        }
        earringEdges[i] = edges;
    }

    bool found = false;
    int e1 = -1, e2 = -1;
    
    for(int i=0; i<N && !found; i++){
        for(int j=i+1; j<N && !found; j++){
            if(earringEdges[i].size() != earringEdges[j].size()) continue;
            int K = earringEdges[i].size();
            for(int s=0; s<K && !found; s++){
                bool match = true;
                for(int k=0; k<K; k++){
                    if(earringEdges[i][k] != earringEdges[j][(k+s)%K]){
                        match = false;
                        break;
                    }
                }
                if(match){
                    e1 = i+1;
                    e2 = j+1;
                    found = true;
                }
            }
        }
    }
    
    if(found){
        cout << e1 << " " << e2;
    } else {
        cout << "No matching pair found.";
    }
    
    return 0;
}

C++
Find Pairs - Codevita
Telegram -