https://leetcode.com/problems/binary-string-with-substrings-representing-1-to-n/
Given a binary string S (a string consisting only of ‘0‘ and ‘1‘s) and a positive integer N,return true if and only if for every integer X from 1 to N,the binary representation of X is a substring of S.
Example 1:
Input: S = "0110",N = 3 Output: true
Example 2:
Input: S = "0110",N = 4 Output: false
Note:
1 <= S.length <= 10001 <= N <= 10^9
代码：
class Solution {
public:
bool queryString(string S,int N) {
int num;
int len = S.length();
for(int i = 0; i <= N; i ++) {
string t = Binary(i);
if(S.find(t) == -1) return false;
}
return true;
}
string Binary(int x) {
string ans = "";
while(x) {
ans += x % 2 + ‘0‘;
x /= 2;
}
for(int i = 0; i < ans.size() / 2; i ++)
swap(ans[i],ans[ans.size() - i - 1]);
return ans;
}
};
五题打卡
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