Compilare: user.cpp: In function ‘int main()’: user.cpp:37:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < nm.size (); ++i) ^ user.cpp:65:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < nm.size (); ++i) ^ user.cpp:20:46: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("dreptunghiuri3.in", "r", stdin); ^ user.cpp:21:48: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("dreptunghiuri3.out", "w", stdout); ^ user.cpp:24:35: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d %d %d", &n, &m, &k); ^ user.cpp:28:85: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d %d %d %d %d", &op[i].a, &op[i].b, &op[i].c, &op[i].d, &op[i].val); ^