Compilare: main.cpp: In function 'void tarjan(int)': main.cpp:31:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v[node].size(); i++) ~~^~~~~~~~~~~~~~~~ main.cpp: In function 'void solve(int)': main.cpp:77:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int it = 0; it < roots[node].size(); it++) ~~~^~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:130:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < v[i].size(); j++) ~~^~~~~~~~~~~~~ main.cpp:135:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < ctc_conex[i].size(); j++) ~~^~~~~~~~~~~~~~~~~~~~~ main.cpp:143:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < ctc_conex[i].size(); j++) ~~^~~~~~~~~~~~~~~~~~~~~