L1-003个位数统计

#include<iostream>#include<string>using namespace std;int main(){    string num;    cin >> num;    int len = num.length();    int i, a[10] = { 0 };    for (i = 0; i < 10; i++)    {        for (int n = 0; n < len ; n++)        {            if (num[n]-'0'== i)a[i]++;        }        if (a[i] != 0)        cout << i << ":" << a[i] << endl;    }    system("pause");}