static class Solution {

public int findNthDigit(int n) {

long num=n;

long size=1;

long max=9;

while(n>0){

//判断不在当前位数内

if(num-max*size>0){

num=num-max*size;

size++;

max=max*10;

}else{

long count=num/size;

long left=num%size;

if(left==0){

return (int) (((long)Math.pow(10, size-1)+count-1)%10);

}else{

return (int) (((long)Math.pow(10, size-1)+count)/((long)Math.pow(10, (size-left)))%10);

}

}

}

return 0;

}

}

public static void main(String[] args) {

Solution solution = new Solution();

int nthDigit = solution.findNthDigit(100);

System.out.println(nthDigit);

}