Compilare: user.cpp: In function ‘void sterge(int, int)’: user.cpp:20:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<g[x].size();i++) ^ user.cpp: In function ‘void init()’: user.cpp:27:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<g[i].size();j++) ^ user.cpp:69:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<k[i].size();j++) ^