Compilare: user.cpp: In function ‘bool contains(int)’: user.cpp:44:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<table[h%LARGE_PRIME].size(); i++) ^ user.cpp: In function ‘void update(int, char*)’: user.cpp:86:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<table[h%LARGE_PRIME].size(); i++) ^ user.cpp: In function ‘int main()’: user.cpp:134:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<sol.size(); i++) ^ user.cpp:136:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=0; j<sol[i]->vals.size(); j++) ^ user.cpp:113:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("litere2.in", "r", stdin); ^ user.cpp:114:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("litere2.out", "w", stdout); ^ user.cpp:118:9: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(s); ^ /tmp/ccW8Bpex.o: In function `main': user.cpp:(.text.startup+0x60): warning: the `gets' function is dangerous and should not be used.