Compilare: user.cpp: In function ‘int main()’: user.cpp:26:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (k = 0; k < qTypes[3].size() / 2; ++k) { ^ user.cpp:34:54: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] bool type3One = (2 * k + 1 != qTypes[3].size() - 1); ^ user.cpp:35:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < qTypes[2].size(); ++i) { ^ user.cpp:39:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < qTypes[1].size(); ++i) { ^