1021 个位数统计

#include"iostream"
using namespace std;

int hashtable[10] = {0};
int main() {
    string str;
    cin>>str;
    for(int i = 0; i < str.length(); ++i)
        hashtable[str[i]-‘0‘]++;
    for(int i = 0; i < 10; ++i) {
        if(hashtable[i] != 0)
            printf("%d:%d\n",i,hashtable[i]);
    }
    return 0;
}