Compilare: user.cpp: In function ‘int main()’: user.cpp:18:49: warning: format ‘%ld’ expects argument of type ‘long int*’, but argument 2 has type ‘int*’ [-Wformat=] scanf ( "%ld %ld %ld %ld" , &N , &M , &R, &C) ; ^ user.cpp:18:49: warning: format ‘%ld’ expects argument of type ‘long int*’, but argument 3 has type ‘int*’ [-Wformat=] user.cpp:18:49: warning: format ‘%ld’ expects argument of type ‘long int*’, but argument 4 has type ‘int*’ [-Wformat=] user.cpp:18:49: warning: format ‘%ld’ expects argument of type ‘long int*’, but argument 5 has type ‘int*’ [-Wformat=] user.cpp:13:43: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ( "balans.in" , "r" , stdin ) ; ^ user.cpp:14:45: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ( "balans.out" , "w" , stdout ) ; ^ user.cpp:18:51: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ( "%ld %ld %ld %ld" , &N , &M , &R, &C) ; ^ user.cpp:34:37: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%ld", &mat[i][j]); ^