Compilare: main.cpp: In function 'void dfs(int)': main.cpp:17:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i<v[r].size(); i++) ~^~~~~~~~~~~~ main.cpp: In function 'void dfst(int)': main.cpp:28:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i<t[r].size(); i++) ~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:58:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 0; j<cv[c[i]].size(); j++) ~^~~~~~~~~~~~~~~~ main.cpp:66:50: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (fout << f[i].size() << ' ', j = 0; j<f[i].size(); j++) ~^~~~~~~~~~~~