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| 1 | +/** |
| 2 | + * @param {string} s |
| 3 | + * @param {number} k |
| 4 | + * @return {number} |
| 5 | + */ |
| 6 | +var minOperations = function(s, k) { |
| 7 | + const N = s.length; |
| 8 | + const Z = [...s].filter(c => c === '0').length; |
| 9 | + const inf = Infinity; |
| 10 | + |
| 11 | + if (N === k) { |
| 12 | + if (Z === 0) return 0; |
| 13 | + else if (Z === N) return 1; |
| 14 | + else return -1; |
| 15 | + } |
| 16 | + |
| 17 | + let res = inf; |
| 18 | + if (Z % 2 === 0) { |
| 19 | + let M = Math.max(ceil(Z, k), ceil(Z, N - k)); |
| 20 | + M += M & 1; |
| 21 | + res = Math.min(res, M); |
| 22 | + } |
| 23 | + if (Z % 2 === k % 2) { |
| 24 | + let M = Math.max(ceil(Z, k), ceil(N - Z, N - k)); |
| 25 | + M += (M & 1) === 0 ? 1 : 0; |
| 26 | + res = Math.min(res, M); |
| 27 | + } |
| 28 | + |
| 29 | + return res < inf ? res : -1; |
| 30 | +}; |
| 31 | +function ceil(x, y) { |
| 32 | + return Math.floor((x + y - 1) / y); |
| 33 | +} |
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