func_code_string: #include <bits/stdc++.h>   using namespace std;   struct node {     int x, y;     int num;   };   node point[303];   char str[5][105];   int t, n, k;   int flag = 0;   int Flag[5][105];   queue<node> Q;   void bfs() {     while (!Q.empty()) {       node D = Q.front(), R;       Q.pop();       if (D.x >= n) {         flag = 1;       }       if (D.num == 1 && str[D.y][D.x + 1] ==  . ) {         for (int j = D.y - 1; j <= D.y + 1; j++) {           if (str[j][D.x + 1] ==  .  && Flag[j][D.x + 1] == 0) {             R.num = 2;             R.x = D.x + 1;             R.y = j;             Q.push(R);             Flag[j][D.x + 1] = 1;           }         }       } else if (D.num == 2 && str[D.y][D.x + 1] ==  .  &&                  str[D.y][D.x + 2] ==  . ) {         R.num = 1;         R.x = D.x + 2;         R.y = D.y;         Q.push(R);       }     }   }   int main() {     int u, v;     scanf( %d , &t);     while (t--) {       memset(Flag, 0, sizeof(Flag));       flag = 0;       scanf( %d%d , &n, &k);       for (int j = 1; j <= 3; j++) scanf( %s , str[j] + 1);       for (int i = 1; i <= 3; i++) {         if (str[i][1] ==  s ) u = i;       }       for (int i = 1; i <= n + 1; i++) {         str[0][i] =  A ;         str[4][i] =  A ;       }       for (int i = 0; i <= 4; i++) str[i][n + 1] =  . ;       node W;       W.x = 1;       W.y = u;       W.num = 1;       Q.push(W);       bfs();       if (flag)         printf( YES n );       else         printf( NO n );     }     return 0;   }   