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| 1 | +/** |
| 2 | + * @param {string} s1 |
| 3 | + * @param {string} s2 |
| 4 | + * @return {boolean} |
| 5 | + */ |
| 6 | + |
| 7 | +var checkInclusion = function (s1: string, s2: string): boolean { |
| 8 | + const len1: number = s1.length; |
| 9 | + const len2: number = s2.length; |
| 10 | + |
| 11 | + if (len1 > len2) return false; |
| 12 | + let alphas = Array.from({ length: 26 }, (x) => 0); |
| 13 | + let begin = 'a'.charCodeAt(0); |
| 14 | + for (let a of s1) alphas[a.charCodeAt(0) - begin]++; |
| 15 | + |
| 16 | + let len = s1.length; |
| 17 | + let count = Array.from({ length: 26 }, (x) => 0); |
| 18 | + //initialize count |
| 19 | + for (let i = 0; i < len; i++) { |
| 20 | + count[s2[i].charCodeAt(0) - begin]++; |
| 21 | + } |
| 22 | + |
| 23 | + //sliding window |
| 24 | + for (let i = len; i <= s2.length; i++) { |
| 25 | + let fit = true; |
| 26 | + for (let i = 0; i < 26; i++) { |
| 27 | + if (count[i] !== alphas[i]) { |
| 28 | + fit = false; |
| 29 | + break; |
| 30 | + } |
| 31 | + } |
| 32 | + if (fit) return true; |
| 33 | + if (i === s2.length) return false; |
| 34 | + //update count |
| 35 | + count[s2[i - len].charCodeAt(0) - begin]--; |
| 36 | + count[s2[i].charCodeAt(0) - begin]++; |
| 37 | + } |
| 38 | +}; |
| 39 | + |
| 40 | +const cd = checkInclusion('ab', 'eidbaooo'); |
| 41 | +const de = checkInclusion('abc', 'ccccbbbbaaaa'); |
| 42 | +console.log('cd', cd); |
| 43 | +console.log('de', de); |
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