Compilare: user.cpp: In function ‘int main()’: user.cpp:26:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] {if(ct==0){if(mn>C.size()){mn=C.size(); ^ user.cpp:39:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(ct==0){if(mn>C.size())mn=C.size();} ^ user.cpp:9:30: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] {freopen("maxk.in","r",stdin); ^ user.cpp:10:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("maxk.out","w",stdout); ^ user.cpp:11:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&k); ^ user.cpp:13:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] {scanf("%d",&x); ^