Compilare: main.cpp: In function 'bool check(int, std::vector<int>&)': main.cpp:16:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(s[it].size()<l) ~~~~~~~~~~~~^~ main.cpp:18:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<q.size();i++) ~^~~~~~~~~ main.cpp: In function 'int main()': main.cpp:35:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=1;j<s[i].size();j++) ~^~~~~~~~~~~~ main.cpp:32:7: warning: unused variable 't' [-Wunused-variable] int t=1; ^