Compilare: main.cpp: In function 'void bfs(int)': main.cpp:20:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<w[nod].size();i++){ ~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:46:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<v[x].size();i++) ~^~~~~~~~~~~~ main.cpp:67:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 0 ; j < w[nod].size() ; j++){ ~~^~~~~~~~~~~~~~~ main.cpp:32:35: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d%d%d",&n,&m,&x); ^ main.cpp:34:34: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d%d",&a,&b); ^ main.cpp:41:34: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d",&nxt[i]); ^