题解 | #[NOIP2010]数字统计#
[NOIP2010]数字统计
http://www.nowcoder.com/practice/179d9754eeaf48a1b9a49dc1d438525a
#include<stdio.h>
int sums(int n){
int x=0;
while(n!=0){
if(n%10==2){
x++;
}
n=n/10;
}
return x;
}
int main(){
int i,a,b,sum=0;
scanf("%d %d",&a,&b);
for(i=a;i<=b;i++){
sum+=sums(i);
}
printf("%d",sum);
return 0;
}
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