Compilare: main.cpp: In function 'void dfs(int)': main.cpp:41:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<v[nod].size(); i++) ~^~~~~~~~~~~~~~ main.cpp:46:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(fr[x]==vt[x].size()) ~~~~~^~~~~~~~~~~~~~ main.cpp: In function 'void dfs2(int)': main.cpp:53:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<vt[nod].size(); i++) ~^~~~~~~~~~~~~~~ main.cpp:58:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(fr[x]==v[x].size()) ~~~~~^~~~~~~~~~~~~ main.cpp: In function 'void read()': main.cpp:12:23: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (f,"%d",&n); ^ main.cpp:14:30: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (f,"%d",&c[i]); ^ main.cpp:17:26: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&m); ^ main.cpp:27:35: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (f,"%d",&x); ^