Compilare: user.cpp: In function ‘int main()’: user.cpp:47:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<V.size();i++) ^ user.cpp:58:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k=j;k<V.size();k++)update(V[k].first,V[k].second,dp[V[k].first][V[k].second]); ^ user.cpp:41:22: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&N); ^ user.cpp:43:29: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&A[i]); ^