func_code_string: #include <bits/stdc++.h>   using namespace std;   int n, m, x, y, dp[108][108][28], dis[108][108];   int DP(int s, int t, int w) {     if (dp[s][t][w -  a ] >= 0) return dp[s][t][w -  a ];     for (int i = 1; i <= n; ++i)       if (dis[s][i] >= w && (DP(t, i, dis[s][i]) == 0))         return dp[s][t][w -  a ] = 1;     return dp[s][t][w -  a ] = 0;   }   int main() {     char z;     scanf( %d%d , &n, &m);     for (int i = 1; i <= m; ++i) {       scanf( %d %d %c , &x, &y, &z);       dis[x][y] = z;     }     memset(dp, -1, sizeof(dp));     for (int i = 1; i <= n; ++i)       for (int j = 1; j <= n; ++j) DP(i, j,  a );     for (int i = 1; i <= n; ++i) {       for (int j = 1; j <= n; ++j) printf( %c , dp[i][j][0] ?  A  :  B );       puts(  );     }   }   