Compilare: main.cpp: In function 'void dfs(int)': main.cpp:18:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < v1[x].size(); i++) { ~~^~~~~~~~~~~~~~ main.cpp: In function 'void dfs2(int)': main.cpp:27:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < v2[x].size(); i++) { ~~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:56:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < sol[i].size(); j++) ~~^~~~~~~~~~~~~~~