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567. Permutation in String

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	`1`	`+// Runtime: 16 ms`
	`2`	`+// Memory Usage: 7.3 MB`
	`3`	`+class Solution {`
	`4`	`+public:`
	`5`	`+ bool checkInclusion(string s1, string s2) {`
	`6`	`+ vector<int> h1(26, 0);`
	`7`	`+ vector<int> h2(26, 0);`
	`8`	`+ if (s2.size() < s1.size()) {`
	`9`	`+ return false;`
	`10`	`+ }`
	`11`	`+ for (char a : s1) {`
	`12`	`+ h1[a - 'a']++;`
	`13`	`+ }`
	`14`	`+ for (int i = 0; i < s1.size(); i++) {`
	`15`	`+ h2[s2[i] - 'a']++;`
	`16`	`+ }`
	`17`	`+ if (h1 == h2) {`
	`18`	`+ return true;`
	`19`	`+ }`
	`20`	`+ for (int i = s1.size(); i < s2.size(); i++) {`
	`21`	`+ h2[s2[i - s1.size()] - 'a']--;`
	`22`	`+ h2[s2[i] - 'a']++;`
	`23`	`+ if (h1 == h2) {`
	`24`	`+ return true;`
	`25`	`+ }`
	`26`	`+ }`
	`27`	`+ return false;`
	`28`	`+ }`
	`29`	`+};`

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