Compilare: user.cpp: In function ‘void Solve()’: user.cpp:65:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < a[x].size(); ++i) ^ user.cpp: In function ‘void DFS(int)’: user.cpp:79:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < b[x].size(); ++i) ^ user.cpp: In function ‘void Read()’: user.cpp:94:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&N); ^ user.cpp:97:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d %d",&x,&y); ^