Compilare: main.cpp: In function 'void read()': main.cpp:25:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < v.size(); i++) { ~~^~~~~~~~~~ main.cpp: In function 'void solve()': main.cpp:52:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 0; j < Q[i].size(); j++) ~~^~~~~~~~~~~~~