Compilare: user.cpp: In function ‘void dfs(int, int)’: user.cpp:12:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[a][x].size();i++) ^ user.cpp: In function ‘int getmatch(int, int)’: user.cpp:47:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int ii=0;ii<v[0][unu].size();ii++) ^ user.cpp:50:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int ii=0;ii<v[1][doi].size();ii++) ^ user.cpp: In function ‘int main()’: user.cpp:102:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<L[0][i].size();j++) ^ user.cpp:103:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(k=0;k<L[1][i].size();k++) ^