Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:35:37: 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:89:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < g[node].size(); i++) { ^ user.cpp:112:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < g[node].size(); i++) { ^ user.cpp:125:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < g[ref1].size(); i++) { ^ user.cpp:130:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < g[ref1].size(); j++) { ^ user.cpp:144:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < g[node].size(); i++) { ^