Compilare: main.cpp: In function 'void tarjan(long long int)': main.cpp:31:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(long long i = 0; i < v[node].size(); i++) ~~^~~~~~~~~~~~~~~~ main.cpp: In function 'void solve(long long int)': main.cpp:77:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(long long it = 0; it < roots[node].size(); it++) ~~~^~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:130:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(long long j = 0; j < v[i].size(); j++) ~~^~~~~~~~~~~~~ main.cpp:135:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(long long j = 0; j < ctc_conex[i].size(); j++) ~~^~~~~~~~~~~~~~~~~~~~~ main.cpp:143:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(long long j = 0; j < ctc_conex[i].size(); j++) ~~^~~~~~~~~~~~~~~~~~~~~