Compilare: main.cpp: In function 'void dfs(int)': main.cpp:49:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<g[node].size(); i++) ~^~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:86:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(sol.size()<n-1 && i<=m){ ~~~~~~~~~~^~~~ main.cpp:58:36: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d%d", &t, &n, &m); ^ main.cpp:60:48: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d", &v[i].nod1, &v[i].nod2); ^