Compilare: user.cpp: In function ‘void Add_To_Hash(int, unsigned int)’: user.cpp:30:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<h[v1].size();i++) ^ user.cpp:31:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(v2==h[v1][i].first) ^ user.cpp: In function ‘int Search_In_Hash(int, unsigned int)’: user.cpp:40:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<h[v1].size();i++) ^ user.cpp:41:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(v2==h[v1][i].first) ^ user.cpp: In function ‘int main()’: user.cpp:56:30: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("seti.in","r",stdin); ^ user.cpp:57:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("seti.out","w",stdout); ^ user.cpp:58:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d ",&N); ^ user.cpp:63:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s ",W); ^ user.cpp:71:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d ",&M); ^ user.cpp:75:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s ",W); ^