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| 1 | +/** |
| 2 | + * @param {string} s |
| 3 | + * @param {number[]} order |
| 4 | + * @param {number} k |
| 5 | + * @return {number} |
| 6 | + */ |
| 7 | +var minTime = function (s, order, k) { |
| 8 | + const n = s.length |
| 9 | + |
| 10 | + function f(mid) { |
| 11 | + const st = s.split('') |
| 12 | + for (let i = 0; i < mid; i++) { |
| 13 | + st[order[i]] = '*' |
| 14 | + } |
| 15 | + |
| 16 | + let total = 0 |
| 17 | + let count = 0 |
| 18 | + for (const ch of st) { |
| 19 | + if (ch === '*') { |
| 20 | + total += (count * (count + 1)) / 2 |
| 21 | + count = 0 |
| 22 | + } else { |
| 23 | + count += 1 |
| 24 | + } |
| 25 | + } |
| 26 | + if (count > 0) { |
| 27 | + total += (count * (count + 1)) / 2 |
| 28 | + } |
| 29 | + |
| 30 | + const invalid = total |
| 31 | + const all_substrings = (n * (n + 1)) / 2 |
| 32 | + const valid = all_substrings - invalid |
| 33 | + |
| 34 | + return valid >= k |
| 35 | + } |
| 36 | + |
| 37 | + let low = 0, |
| 38 | + high = n |
| 39 | + let res = -1 |
| 40 | + while (low <= high) { |
| 41 | + const mid = (low + high) >> 1 |
| 42 | + |
| 43 | + if (f(mid)) { |
| 44 | + res = mid |
| 45 | + high = mid - 1 |
| 46 | + } else { |
| 47 | + low = mid + 1 |
| 48 | + } |
| 49 | + } |
| 50 | + |
| 51 | + return res !== -1 ? res - 1 : res |
| 52 | +} |
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