Compilare: main.cpp: In function 'int main()': main.cpp:52:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (long long i = 0; i < q[1].size(); ++i) ~~^~~~~~~~~~~~~ main.cpp:55:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (long long i = 0; i < q[k].size(); ++i) { ~~^~~~~~~~~~~~~ main.cpp:57:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (long long j = 0; j < q[k + 1].size(); ++j) { ~~^~~~~~~~~~~~~~~~~ main.cpp:68:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (long long i = 0; i < q[K].size(); ++i) { ~~^~~~~~~~~~~~~