Compilare: main.cpp: In function 'int col(int)': main.cpp:21:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ main.cpp: In function 'int add_element(int, int)': main.cpp:33:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ main.cpp: In function 'int blackandwhite(int)': main.cpp:40:42: warning: suggest parentheses around comparison in operand of '^' [-Wparentheses] if(smen[k][i][j] ^ mat[i][j] != k){ ~~~~~~~~~~^~~~ main.cpp: In function 'int main()': main.cpp:55:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("identice.in", "r", stdin); ^ main.cpp:56:41: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("identice.out", "w", stdout); ^ main.cpp:58:32: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &T, &N, &D); ^ main.cpp:60:23: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%s", s); ^