Compilare: user.cpp: In function ‘bool Find()’: user.cpp:51:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < viz[x1].size(); ++i) ^ user.cpp: In function ‘void Solve()’: user.cpp:90:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < Hash[x1].size(); ++i) ^ user.cpp:99:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < Hash[x1].size(); ++i) ^ user.cpp:87:12: warning: unused variable ‘j’ [-Wunused-variable] int i, j, ans = 0; ^ user.cpp: In function ‘void Read()’: user.cpp:29:14: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets( T ); gets( F ); ^ user.cpp:29:25: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets( T ); gets( F ); ^ /tmp/ccEloVBI.o: In function `Read()': user.cpp:(.text+0x77): warning: the `gets' function is dangerous and should not be used.