Compilare: main.cpp: In function 'int main()': main.cpp:37:21: warning: variable 'cnt' set but not used [-Wunused-but-set-variable] int n , m , i , cnt , gc , nr , j; ^~~ main.cpp:35:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("groaza.in" , "r" , stdin); ^ main.cpp:36:41: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("groaza.out" , "w" , stdout); ^ main.cpp:38:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d" , &n , &m); ^