Compilare: user.cpp: In function ‘int main()’: user.cpp:47:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<C.size();++i) ^ user.cpp:65:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0,no=false;i<D.size();++i) ^ user.cpp:76:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=P=0,i=D.size();i<C.size();++j,++i) ^ user.cpp:95:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<C.size();++i) ^ user.cpp:112:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0,no=false;i<D.size();++i) ^ user.cpp:121:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=P=0,i=0;i<C.size()-D.size();++j,++i) ^ user.cpp:19:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("subsiruri2.in","r",stdin); ^ user.cpp:20:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("subsiruri2.out","w",stdout); ^ user.cpp:22:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%s",&N,w); ^