Compilare: user.cpp: In function ‘void Add_To_Hash(int, std::pair<int, int>)’: user.cpp:37:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<h[val.first].size();i++) ^ user.cpp: In function ‘bool Search(int, std::pair<int, int>)’: user.cpp:43:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<h[val.first].size();i++) ^ user.cpp: In function ‘std::pair<int, int> Read_Word(int&)’: user.cpp:24:24: 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:49:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("criptare2.in","r",stdin); ^ user.cpp:50:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("criptare2.out","w",stdout); ^ user.cpp:52:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d ",&N); ^ user.cpp:55:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d ",&M); ^