NOJ/24.1/main.c
Saturneric 52668c4122 Add.
2020-09-01 00:46:43 +08:00

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#include <stdio.h>
int main(void){
unsigned long long n, c = 0, x, pow = 1, lx = 0;
scanf("%llu",&n);
while(n){ //当n不等于0的时候才继续循环
x = n % 10; //将n现在的最低位赋值给x
n /= 10;
if(n){//当n不等于0的时候,就是判断现在的处理的位是否到了最后一位
if(x == 1){
c += (lx+1) + n * pow; //总数加上现在的位上出现1的次数
}
else c += (x>0?n+1:n) * pow; //同上
}
else if(x < 2)
c += lx+1;
else c += pow;
lx += x * pow;//记录x位后面的位作为以后x=1的时候的计算依据
pow *= 10;
}
printf("%llu\n",c);
return 0;
}