Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:59:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < g[node].size(); i++) { ^ user.cpp: In function ‘int main()’: user.cpp:118:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < g[node].size(); i++) { ^ user.cpp:143:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < g[node].size(); i++) { ^ user.cpp:160:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < g[ref1].size(); i++) { ^ user.cpp:167:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < g[ref2].size(); j++) { ^ user.cpp:184:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < g[node].size(); i++) { ^