Compilare: user.cpp: In function ‘int main()’: user.cpp:21:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(v.size() - poz_max == M){ ^ user.cpp:22:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = poz_max; i < v.size(); i++) printf("%d", v[i]); ^ user.cpp:10:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("trompeta.in", "r", stdin); ^ user.cpp:11:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("trompeta.out", "w", stdout); ^ user.cpp:12:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &N, &M); ^ user.cpp:14:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%c", &c); ^