阶乘之和

Description

对于整数ppp，给出以下定义
p=x1!+x2!+x3!+…+xq!(xi

#include<cstdio>
#include<cstring>
#include<vector>
#include<iostream>
#include<algorithm>
using namespace std;
typedef long long ll;
vector<ll> vecx,vecy;
ll a[30];
int main()
{
    //freopen("in.txt","r",stdin);
    //freopen("out.txt","w",stdout);

    a[0]=1;
    for(ll i=1;i<=20;i++){
        a[i]=i*a[i-1];
    }
    int T;
    scanf("%d",&T);
    int Case=1;
    ll x,y;
    while(T--){
        scanf("%lld%lld",&x,&y);
        ll n=x,m=y;
        int flagx=0;
        int flagy=0;
        for(ll i=20;i>=1;i--){

            if(x-a[i]>=0){
                vecx.push_back(i);
                x-=a[i];
                if(x==0) flagx=1;
            } 

            if(y-a[i]>=0){
                vecy.push_back(i);
                y-=a[i];
                if(y==0) flagy=1;
            } 
        }
        printf("Case %d:",Case++);
        if(flagx+flagy==2){
            printf("SEYES\n");
            if(vecx.size()==vecy.size()){

                printf("%lld=%lld!",n,vecx[vecx.size()-1]);
                for(ll i=vecx.size()-2;i>=0;i--)
                    printf("+%lld!",vecx[i]);
                printf("\n");

                printf("%lld=%lld!",m,vecy[vecy.size()-1]);
                for(ll i=vecy.size()-2;i>=0;i--)
                    printf("+%lld!",vecy[i]);
                printf("\n");

            }else{
                printf("dWvWb\n");
            }
        }else if(flagx+flagy==1){
            printf("YNEOS\n");
            printf("dWvWb\n");
        }else{
            printf("ONO\n");
            printf("dWvWb\n");
        }

        vecx.clear();
        vecy.clear();
    }

    return 0;
}