Compilare: main.cpp: In function 'bool ok(int)': main.cpp:15:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<q.size();i++){ ~^~~~~~~~~ main.cpp:18:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=last[q[i]];j<poz[q[i]].size();j++) ~^~~~~~~~~~~~~~~~~ main.cpp:25:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(poz[q[i]].size()-k>=r) ~~~~~~~~~~~~~~~~~~^~~ main.cpp:31:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(poz[q[i]].size()<r) ~~~~~~~~~~~~~~~~^~ main.cpp: In function 'int main()': main.cpp:52:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<s.size();i++) ~^~~~~~~~~