Compilare: user.cpp: In function ‘bool Search(Hash)’: user.cpp:87:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<H[S].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:107:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<H[i].size();j++) ^ user.cpp: In function ‘void Read(int&)’: user.cpp:25:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%c",&ch); ^ user.cpp:28:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] sign=1,scanf("%c",&ch); ^ user.cpp:37:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%c",&ch); ^ user.cpp: In function ‘int main()’: user.cpp:98:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("patrate3.in","r",stdin); ^ user.cpp:99:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("patrate3.out","w",stdout); ^ user.cpp:100:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&N); ^