Compilare: user.cpp: In function ‘int main()’: user.cpp:85:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<A.size();i++) ^ user.cpp:89:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=A.size();i<B.size();i++) ^ user.cpp:96:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<B.size();i++) ^ user.cpp:100:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=B.size();i<A.size();i++) ^ user.cpp:44:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("plan.in","r",stdin); ^ user.cpp:45:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("plan.out","w",stdout); ^ user.cpp:46:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ user.cpp:49:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&x,&y); ^