题解 | #数位染色#

#include<iostream>
using namespace std;
bool ans = false;
void dfs(string num,int temp,int val)
{
    if(temp >= val){
        if(temp == val){
            ans = true;
            return;
        }
        else
            return;
    }
    else if(num.size()){
        dfs(num.substr(1),temp + num[0] - '0',val);
        dfs(num.substr(1),temp,val);
    }
    else
        return;
}
int main()
{
    ios::sync_with_stdio(false);
    cin.tie(0);
    string num;
    cin >> num;
    int val = 0;
    for(int i = 0;i < num.size();++i)
        val += num[i] - '0';
    if(val % 2 == 0)
        dfs(num,0,val / 2);
    if(ans)
        cout << "Yes";
    else
        cout << "No";
}