Compilare: main.cpp: In function 'int main()': main.cpp:52:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < q[1].size(); ++i) ~~^~~~~~~~~~~~~ main.cpp:55:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < q[k].size(); ++i) { ~~^~~~~~~~~~~~~ main.cpp:57:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < q[k + 1].size(); ++j) { ~~^~~~~~~~~~~~~~~~~ main.cpp:68:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < q[K].size(); ++i) { ~~^~~~~~~~~~~~~