Compilare: user.cpp: In function ‘int main()’: user.cpp:36:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < s.size(); i++) { ^ user.cpp:41:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i < txt.size(); i++) { ^ user.cpp:46:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = s.size() - 1; i < txt.size(); i++) { ^ user.cpp:47:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] ull rolling = h[i] - (s.size() <= i ? h[i - s.size()] * shift : 0); ^ user.cpp:57:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v.size(); ++ i) { ^