Compilare: user.cpp: In function ‘int main()’: user.cpp:41:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] {for(j=0;j<vc[i].size();j++) ^ user.cpp:43:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<vec[i].size();j++) ^ user.cpp:13:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] {freopen ("culegere.in","r",stdin); ^ user.cpp:14:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("culegere.out","w",stdout); ^ user.cpp:16:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d",&n,&m,&k,&q); ^ user.cpp:26:48: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] {scanf("%d%d%d%d%d",&a.sqq,&a.x,&a.y,&p,&r); ^ user.cpp:28:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&a.val); ^