Compilare: user.cpp: In function ‘NODE* obtainNode(int)’: user.cpp:47:44: 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:103:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<sol.size(); i++) ^ user.cpp:105:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=0; j<sol[i]->vals.size(); j++) ^ user.cpp:82:35: 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:83:37: 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:87:9: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(s); ^ /tmp/ccZbVIC6.o: In function `main': user.cpp:(.text.startup+0x60): warning: the `gets' function is dangerous and should not be used.