#include <iostream> using namespace std; int main() { int z; cin>>z; int a=0,s=0,d=0,f=0; a=z%10; s=z/10%10; d=z/100%10; f=z/1000; if(aaaa+ssss+dddd+ffff==z){ cout<<"Yes"<<endl; }else{ cout<<"No"; } return 0; }

题解