Compilare: main.cpp: In function 'void dfs(int)': main.cpp:23:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<v[nod].size();i++){ ~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:64:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (k=0;k<v[nr1].size();k++) ~^~~~~~~~~~~~~~ main.cpp:37:37: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d%d%d\n",&n,&m,&q); ^ main.cpp:82:48: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d%d%d%d",&l1,&c1,&l2,&c2); ^