Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:58:37: 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:117:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < g[node].size(); i++) { ^ user.cpp:141:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < g[node].size(); i++) { ^ user.cpp:155:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < g[ref1].size(); i++) { ^ user.cpp:162:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < g[ref2].size(); j++) { ^ user.cpp:178:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < g[node].size(); i++) { ^