Compilare: user.cpp: In function ‘int find_hash(int, int, int)’: user.cpp:18:67: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < Hash[pos][(val1 * 1LL * val2) % MOD].size(); i ++ ) { ^ user.cpp: In function ‘int main()’: user.cpp:93:47: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen( "subsecvente2.in" , "r", stdin ); ^ user.cpp:94:47: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen( "subsecvente2.out", "w", stdout ); ^ user.cpp:96:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf( "%d", &N ); K = 60; ^ user.cpp:98:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf( "%s", S[i] ); ^