Compilare: user.cpp: In function ‘bool found(int)’: user.cpp:21:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<H[line].size();++i) ^ user.cpp: In function ‘int main()’: user.cpp:41:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<pos.size();++i) ^ user.cpp:29:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("perioada01.in","r",stdin); ^ user.cpp:30:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("perioada01.out","w",stdout); ^ user.cpp:32:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for (i=1,scanf("%d%d",&N,&P);i<=P;++i) ^ user.cpp:34:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&X[i]); ^