Compilare: user.cpp: In function ‘int main()’: user.cpp:29:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(intra[i] < g[i].size()) { ~~~~~~~~~^~~~~~~~~~~~~ user.cpp:34:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] else if(intra[i] > g[i].size()){ ~~~~~~~~~^~~~~~~~~~~~~ user.cpp:16:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d%d", &n, &m); ^ user.cpp:18:54: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d%d", &v[i].first, &v[i].second); ^