Compilare: main.cpp: In function 'void Tarjan(int, std::vector<int>*, int*, int*, int*, bool*, std::vector<std::vector<int> >&)': main.cpp:29:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<v[x].size(); ++i) { ~^~~~~~~~~~~~ main.cpp: In function 'void start_RoyFloyd(int, std::vector<int>*, std::vector<std::vector<int> >&)': main.cpp:56:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < v[i].size(); ++j) { ~~^~~~~~~~~~~~~ main.cpp: In function 'void start_Kosaraju(int, std::vector<int>*, std::vector<std::vector<int> >&)': main.cpp:121:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < v[i].size(); ++j) ~~^~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:164:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<ctc.size(); ++i) { ~^~~~~~~~~~~