func_code_string: #include <bits/stdc++.h>   using namespace std;   int Set(int N, int pos) { return N = N | (1 << pos); }   int reset(int N, int pos) { return N = N & ~(1 << pos); }   bool check(int N, int pos) { return (bool)(N & (1 << pos)); }   inline int addmod(int x, int y) {     return (x % 1000000007 + y % 1000000007) % 1000000007;   }   inline int submod(int x, int y) {     return (x % 1000000007 - y % 1000000007 + 1000000007) % 1000000007;   }   inline int mulmod(int x, int y) {     return (x % 1000000007 * 1LL * y % 1000000007) % 1000000007;   }   inline int nextSubMask(int i, int mask) { return (i - 1) & mask; }   template <typename T>   void we_r_done(T mssg) {     cout << mssg;     exit(0);   }   vector<char> chick;   string s[102];   int n, m, c;   int row, col;   bool vis[111][111];   void fixrc(int i, int j) {     row = i;     col = j;   }   char who;   void fun(int i, int j, int baki) {     if (s[i][j] ==  R  && baki == 0) {       fixrc(i, j);       return;     }     baki -= (s[i][j] ==  R );     s[i][j] = who;     vis[i][j] = true;     if (j && vis[i][j - 1] == false) {       fun(i, j - 1, baki);     } else if ((j + 1) < m && vis[i][j + 1] == false) {       fun(i, j + 1, baki);     } else if (i)       fun(i - 1, j, baki);   }   int main() {     for (char i =  0 ; i <=  9 ; i++) chick.push_back(i);     for (char i =  A ; i <=  Z ; i++) chick.push_back(i);     for (char i =  a ; i <=  z ; i++) chick.push_back(i);     int t;     cin >> t;     while (t--) {       cin >> n >> m >> c;       int tot = 0;       for (int i = 0; i < n; i++) {         cin >> s[i];         for (int j = 0; j < m; j++) {           tot += (s[i][j] ==  R );           vis[i][j] = false;         }       }       row = n - 1;       col = m - 1;       char last;       for (int i = 0; i < c; i++) {         who = chick[i];         int cc = c - i;         cc = tot / cc + (tot % cc != 0);         tot -= cc;         fun(row, col, cc);       }       for (int i = 0; i < n; i++) {         for (int j = 0; j < m; j++) {           cout << s[i][j];         }         cout << endl;       }     }     return 0;   }   