Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:20:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[nod].size();++i) ^ user.cpp: In function ‘int main()’: user.cpp:55:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<p[1].size()&&ok;++i) ^ user.cpp:57:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<p[4].size()&&ok;++j) ^ user.cpp:59:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<p[5].size()&&ok;++j) ^ user.cpp:61:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<p[2].size()&&ok;++j) ^ user.cpp:64:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<p[2].size()&&ok;++i) ^ user.cpp:66:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<p[4].size()&&ok;++j) ^ user.cpp:68:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<p[6].size()&&ok;++j) ^ user.cpp:70:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<p[3].size()&&ok;++j) ^ user.cpp:73:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<p[3].size()&&ok;++i) ^ user.cpp:75:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<p[6].size()&&ok;++j) ^ user.cpp:77:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<p[5].size()&&ok;++j) ^ user.cpp:79:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<p[1].size()&&ok;++j) ^