B1084 外观数列

题目：https://pintia.cn/problem-sets/994805260223102976/problems/994805260583813120
特别注意一下to_string的用法，里面参数要填成long long类型的才能在vs上通过，但是在PTA上面没问题

代码

#include<cstdio>
#include<string>
#include<iostream>
#include<algorithm>
using namespace std;
int main(){
    string d;
    int n, j;
    cin>>d;
    scanf("%d", &n);
    for(int cnt = 1; cnt < n; cnt++){
        string t;
        for(int i = 0; i < d.size(); i = j){
            for(j = i; j < d.size() && d[j]==d[i]; j++);
            t += d[i] + to_string((long long)(j - i));
        }
        d = t;
    }
    cout<<d<<endl;
    return 0;
}

理解错了题意的写法

#include<cstdio>
#include<string>
#include<iostream>
#include<algorithm>
using namespace std;
int main(){
    string d;
    int n;
    cin>>d;
    scanf("%d", &n);
    for(int a = 0; a < n; a++){
        int hash[1000] = {0};
        for(int i = 0; i < d.size(); i++){
            hash[d[i] - '0']++;
        }
        d = "";
        for(int i = 0; i < 1000; i++){
            if(hash[i] != 0){
                d += i + '0';
                while(hash[i] != 0){
                    d += hash[i] % 10 + '0';
                    hash[i] /= 10;
                }
            }
        }
        cout<<d<<endl;
    }
}