#include <iostream>
#include <vector>
#include <algorithm>
#include <cstring>
using namespace std;
int dfs(int node, vector<int>& likes, vector<int>& visited, vector<int>& stack, vector<int>& index, int& counter) {
    if (visited[node] == 2) {
        return 0;
    }
    if (visited[node] == 1) {
        return counter - index[node];
    }
    visited[node] = 1;
    stack.push_back(node);
    index[node] = counter++;
    int cycle_length = dfs(likes[node], likes, visited, stack, index, counter);
    if (cycle_length) {
        return cycle_length;
    }
    stack.pop_back();
    visited[node] = 2;
    counter--;
   
    return 0;
}
int maxCEOsAttend(int num, vector<int>& likes) {
    vector<int> visited(num, 0);
    vector<int> stack;
    vector<int> index(num, 0);
    int counter = 0;
    int max_cycle_length = 0;
    for (int i = 0; i < num; ++i) {
        if (!visited[i]) {
            int cycle_length = dfs(i, likes, visited, stack, index, counter);
            max_cycle_length = max(max_cycle_length, cycle_length);
        }
    }
    return max_cycle_length;
}
int main() {
    int num;
    cin >> num;
    vector<int> likes(num);
    for (int i = 0; i < num; ++i) {
        cin >> likes[i];
        likes[i]--;
    }
    cout << maxCEOsAttend(num, likes) << endl;
    return 0;
}

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class UserMainCode(object):

    @classmethod
    def strongString(cls, input1, input2):
        n = len(input2)
        min_strings = []

        for i in range(min(input1, n)):
            distribution = [''] * input1
            for j in range(n):
                distribution[j % input1] += input2[j]

            min_string = min(distribution)
            min_strings.append(min_string)

        result = max(min_strings)
        return result

Game of String Distribution ✅

def profitable_project_pairs(profit, implementationCost):
    n = len(profit)
    net_profit = [profit[i] - implementationCost[i] for i in range(n)]
   
    net_profit.sort()
   
    count = 0
    left = 0
    right = n - 1
   
    while left < right:
        if net_profit[left] + net_profit[right] > 0:
            count += (right - left)
            right -= 1
        else:
            left += 1
   
    return count

Profitable project pairs ✅
Workspan