int gen_ans(int N, int M, int K, vector<vector<int>> A) {
    vector<vector<int>> col(N+1, vector<int>(M));
    for(int j=0; j<M; j++)
        for(int i=0; i<N; i++)
            col[i+1][j] = col[i][j] + (A[i][j] == K);
    long long Tot = 0, Freq = 0;
    int MaxB = 0;
    vector<int> r(M), v(M);
    for(int i=0; i<N; i++) for(int k=i+1; k<N; k++){
        int h = k - i + 1;
        for(int j=0; j<M; j++){
            r[j] = (A[i][j] == K && A[k][j] == K);
            v[j] = (col[k+1][j] - col[i][j] == h);
        }
        for(int j=0; j<M; ){
            if(!r[j]) { j++; continue; }
            int s = j;
            while(j<M && r[j]) j++;
            int e = j-1, cnt = 0, f = -1, l = -1;
            for(int t=s; t<=e; t++) if(v[t]){
                if(f<0) f = t;
                l = t;
                cnt++;
            }
            if(cnt >= 2){
                Tot += 1LL*cnt*(cnt-1)/2;
                int w = l - f + 1;
                int b = 2*(h + w) - 4;
                if(b > MaxB){ MaxB = b; Freq = 1; }
                else if(b == MaxB) Freq++;
            }
        }
    }
    if(!Tot) return 0;
    return Tot ^ MaxB ^ Freq;
}
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