209.Minimum Size Sbuarray Sum
用滑動視窗法,維護兩個變數left,right,當它們之間的陣列和sum>=s時,逐步將left往右移,在保證sum>=s時,更新sum和len。當sum<s時,將right往右移,直到sum>=s時,重複剛剛的步驟。
class Solution { public int minSubArrayLen(int s, int[] nums) { int result = Integer.MAX_VALUE, sum = 0, j = 0; for (int i = 0; i < nums.length; i++){ sum+=nums[i]; while (sum >= s){ result = Math.min(result, i-j+1); sum-=nums[j++]; } } return result == Integer.MAX_VALUE? 0:result; } }
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