95分纯枚举，一直95求调

#include<bits/stdc++.h>
using namespace std;
int a,b,c,d,e,f,g,h,i1,j,k,l,m,n,o,p,q,r,s1,t,u,v,w,x,y,z;
int main(){
	string s;
	cin>>s;
	for(int i=0;i<s.size();i++){

		if(s[i]=='a'){
			a++;
		}
		if(s[i]=='b'){
			b++;
		}
		if(s[i]=='c'){
			c++;
		}
		if(s[i]=='d'){
			d++;
		}
		if(s[i]=='e'){
			e++;
		}
		if(s[i]=='f'){
			f++;
		}
		if(s[i]=='g'){
			g++;
		}
		if(s[i]=='h'){
			h++;
		}
		if(s[i]=='i'){
			i1++;
		}
		if(s[i]=='j'){
			j++;
		}
		if(s[i]=='k'){
			k++;
		}
		if(s[i]=='l'){
			l++;
		}
		if(s[i]=='m'){
			m++;
		}
		if(s[i]=='n'){
			n++;
		}
		if(s[i]=='o'){
			o++;
		}
		if(s[i]=='p'){
			p++;
		}
		if(s[i]=='q'){
			q++;
		}
		if(s[i]=='r'){
			r++;
		}
		if(s[i]=='s'){
			s1++;
		}
		if(s[i]=='t'){
			t++;
		}
		if(s[i]=='u'){
			u++;
		}
		if(s[i]=='v'){
			v++;
		}
		if(s[i]=='w'){
			w++;
		}
		if(s[i]=='x'){
			x++;
		}
		if(s[i]=='y'){
			y++;
		}
		if(s[i]=='z'){
			z++; 
		}
	}
	bool joker=(a%2==0)&&(b%2==0)&&(c%2==0)&&(d%2==0)&&(e%2==0)&&(f%2==0)&&(g%2==0)&&(h%2==0)&&(i1%2==0)&&(g%2==0)&&(k%2==0)&&(l%2==0)&&(m%2==0)&&(n%2==0)&&(o%2==0)&&(p%2==0)&&(q%2==0)&&(r%2==0)&&(s1%2==0)&&(t%2==0)&&(u%2==0)&&(v%2==0)&&(w%2==0)&&(x%2==0)&&(y%2==0)&&(z%2==0);
	if(joker){
		cout<<"YES";
	}else{
		cout<<"NO";
	
	}
	return 0;
}