Compilare: main.cpp: In function 'int main()': main.cpp:78:13: warning: unused variable 'blah' [-Wunused-variable] int blah = 0; ^~~~ main.cpp: In function 'void dfs(int)': main.cpp:181:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < neighbors[nod].size(); i++) { ~~^~~~~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:51:37: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d%d", &p, &N, &K); ^ main.cpp:56:80: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d",&v[i].vertices[j].first,&v[i].vertices[j].second); ^