Compilare: user.cpp: In function ‘int main()’: user.cpp:31:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(dp[i].size()>mx.second) mx = {i,dp[i].size()}; ^ user.cpp:18:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("scmax.in","r",stdin); ^ user.cpp:19:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("scmax.out","w",stdout); ^