Compilare: user.cpp: In function ‘int gen(int)’: user.cpp:41:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=1;j<s[i].size();j++) ^ user.cpp:60:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<a.size()-1;i++) ^ user.cpp:27:9: warning: variable ‘val’ set but not used [-Wunused-but-set-variable] int val,k; ^ user.cpp:27:13: warning: variable ‘k’ set but not used [-Wunused-but-set-variable] int val,k; ^ user.cpp: In function ‘int main()’: user.cpp:89:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(s[i].size()<Min) ^ user.cpp: In function ‘bool comp(std::pair<int, int>, std::pair<int, int>)’: user.cpp:22:1: warning: control reaches end of non-void function [-Wreturn-type] } ^