Compilare: main.cpp: In function 'void dfs(int, int, int)': main.cpp:16:15: 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:49:30: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d%d",&n,&q); ^ main.cpp:51:34: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d%d",&x,&y); ^ main.cpp:76:32: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d",&w[i]); ^ main.cpp:165:22: warning: 'mc' may be used uninitialized in this function [-Wmaybe-uninitialized] sol[q + 1].first = mc; ~~~~~~~~~~~~~~~~~^~~~ main.cpp:145:21: warning: 'ma' may be used uninitialized in this function [-Wmaybe-uninitialized] if (nivel[n1i] + nivel[n3] - 2 * nivel[lca(n1i , n3)] > mc){ ^~