Compilare: main.cpp: In function 'int main()': main.cpp:31:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < L[r].size(); i++) ~~^~~~~~~~~~~~~ main.cpp:49:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < L[next].size(); i++) ~~^~~~~~~~~~~~~~~~ main.cpp:58:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < sol.size(); i++) ~~^~~~~~~~~~~~