Compilare: main.cpp: In function 'void dfs(int)': main.cpp:21:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<G1[node].size(); i++) ~^~~~~~~~~~~~~~~~ main.cpp: In function 'void compute_max_dist()': main.cpp:63:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<G3[node].size(); i++) ~^~~~~~~~~~~~~~~~ main.cpp: In function 'void solve()': main.cpp:94:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<max_dist[D].size();i++) ~^~~~~~~~~~~~~~~~~~~ main.cpp:97:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<G2[node].size();j++) ~^~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:138:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<G1[i].size(); j++) ~^~~~~~~~~~~~~ main.cpp:154:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=1; j<G2[i].size(); j++) ~^~~~~~~~~~~~~ main.cpp:162:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<v.size(); j++) ~^~~~~~~~~ main.cpp:174:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<G2[i].size(); j++) ~^~~~~~~~~~~~~ main.cpp:193:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<sol.size(); i++) ~^~~~~~~~~~~