View Compilation Error

0_0_18514156_3292.cpp: In function 'int solve(int, int)':
0_0_18514156_3292.cpp:23:22: error: 'strcpy' was not declared in this scope
   strcpy(ans[top++],a);
                      ^
0_0_18514156_3292.cpp:66:21: error: 'strcpy' was not declared in this scope
  strcpy(ans[top++],b);
                     ^
0_0_18514156_3292.cpp: In function 'int main()':
0_0_18514156_3292.cpp:87:21: error: 'strlen' was not declared in this scope
   int len = strlen(a);
                     ^