题解 | #[NOIP2010]数字统计#
[NOIP2010]数字统计
https://www.nowcoder.com/practice/179d9754eeaf48a1b9a49dc1d438525a
#include <stdio.h>
int main() {
int a, b;
int count=0;
while (scanf("%d %d", &a, &b) != EOF) { // 注意 while 处理多个
for(int i=a;i<=b;i++){
int val=i;
while(val){
if(val%10==2){
count++;
}
val/=10;
}
}
printf("%d",count);
}
return 0;
}
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