Compilare: user.cpp: In function ‘int main()’: user.cpp:33:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < G[i].size(); j++) ~~^~~~~~~~~~~~~ user.cpp:35:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int ind = 0; ind < V.size(); ind++){ ~~~~^~~~~~~~~~ user.cpp:21:36: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d%d%d", &k, &n, &m); ^ user.cpp:22:68: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for(int i = 1; i <= k; i++) fscanf(fi,"%d", &x), V.push_back(x); ^ user.cpp:26:50: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d%d%lld%lld", &a, &b, &c, &d); ^