题解 | #[NOIP2010]数字统计#
[NOIP2010]数字统计
https://www.nowcoder.com/practice/179d9754eeaf48a1b9a49dc1d438525a
#include <stdio.h>
//函数名的意思是2出现的次数
int Number2OfOccurrences(int L, int R)
{
int count = 0; //记录二出现的次数
for(int i = L; i <=R; i++)
{
int tmp = i;
while (tmp)
{
//判断余数为2，计数加一
if(tmp % 10 == 2)
count++;
tmp /= 10;
}
}
return count;
}
int main() {
int L, R;
scanf("%d %d", &L, &R);
int sum = Number2OfOccurrences(L, R);
printf("%d", sum);
}
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