Compilare: user.cpp: In function ‘int main()’: user.cpp:96:28: warning: format ‘%ld’ expects argument of type ‘long int’, but argument 2 has type ‘ll {aka long long int}’ [-Wformat=] printf("%ld.", res / 1000); ^ user.cpp:97:27: warning: format ‘%ld’ expects argument of type ‘long int’, but argument 2 has type ‘ll {aka long long int}’ [-Wformat=] printf("%ld", res % 1000); ^ user.cpp:60:35: 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:61:37: 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:64:36: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d", &n, &m, &r, &c); ^ user.cpp:69:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &a[i][j]); ^