Compilare: main.cpp: In function 'void computesol2(int, long long int&)': main.cpp:39:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<active_set.size(); ++i) ~^~~~~~~~~~~~~~~~~~ main.cpp:40:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j<g[active_set[i]].size(); ++j) ~^~~~~~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:70:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<e.size(); ++i) { ~^~~~~~~~~