http://whu.contest.codeforces.com/group/LqmZzHyOQN/contest/234192/problem/D

題解：

其實全部打亂重新排就行了

/* *@Author: STZG *@Language: C++ */ #include <bits/stdc++.h> #include<iostream> #include<algorithm> #include<cstdlib> #include<cstring> #include<cstdio> #include<string> #include<vector> #include<bitset> #include<queue> #include<deque> #include<stack> #include<cmath> #include<list> #include<map> #include<set> //#define DEBUG #define RI register int using namespace std; typedef long long ll; //typedef __int128 lll; const int N=1000000+100; const int MOD=1e9+7; const double PI = acos(-1.0); const double EXP = 1E-8; const int INF = 0x3f3f3f3f; int t,n,m,k,q; char str[N]; int main() { #ifdef DEBUGfreopen("input.in", "r", stdin);//freopen("output.out", "w", stdout); #endifscanf("%d",&t);while(t--){scanf("%d",&n);scanf("%s",str);int a[10]={6,2,5,5,4,5,6,3,7,6};int sum=0;for(int i=0;i<n;i++){sum+=a[str[i]-'0'];}int b[10]={0,0,1,7,4,5,9,8};string ans="";for(int i=0;i<n;i++){if(i==n-1){ans+='0'+b[sum];break;}if((n-i-1)*2<=sum-6){sum-=6;ans+="9";}else if((n-i-1)*2<=sum-3){sum-=3;ans+="7";}else if((n-i-1)*2<=sum-2){sum-=2;ans+="1";}}cout << ans << endl;}//cout << "Hello world!" << endl;return 0; }

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總結

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