pat-bl-1056

pat-bl-1056

2017-01-24

• 一道数学题，找到套路就好做
• 套路：每个数字在十位和各位出现的次数都是n-1

/** * pat-bl-1056 * 2017-01-24 * C version * Author: fengLian_s */#include<stdio.h>int main(){  freopen("in.txt", "r", stdin);  int n;  int sum = 0;  scanf("%d", &n);  for(int i = 0;i < n;i++)  {    int tmp;    scanf("%d", &tmp);    //printf("tmp = %d\n", tmp);    sum += ((tmp * 10 + tmp) * (n-1));  }  printf("%d\n", sum);}

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