Compilare: main.cpp: In function 'int bfs(int)': main.cpp:38:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<gr[x].size();i++){ ~^~~~~~~~~~~~~ main.cpp:48:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<aux.size();i++){ ~^~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:62:22: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&n); ^ main.cpp:64:29: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&tmp[i]); ^ main.cpp:68:24: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&m); ^ main.cpp:72:26: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&x); ^