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