Compilare: user.cpp: In function ‘void dfs(int, int)’: user.cpp:20:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<g[v].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:60:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<sol.size();i++) { ^ user.cpp:63:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=1;j<sol[i].size();j++) if (sol[i][j]!=sol[i][j-1]) ^