题解 | #数字序列中某一位的数字#(C++ 版本)
数字序列中某一位的数字
http://www.nowcoder.com/practice/29311ff7404d44e0b07077f4201418f5
class Solution { public:
int findNthDigit(int n) {
int digCont = 1; //位数
long long start = 1, count = 9; // 0~9 10~99 100~999
while(n > count) {
n -= count;
digCont += 1;
start *= 10;
count = start * digCont * 9;
}
int num = start + (n - 1) / digCont;
string s = to_string(num);
int result = s[(n - 1) % digCont] - '0';
return result;
}
};
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