LeetCode 330 Patching Array
Refer: https://www.hrwhisper.me/leetcode-patching-array/
就是用known_sum表示已知的连续和为[1,known_sum),有了这个表示那就简单了:
- nums[i] <= known_sum,更新已知范围为:[1,known_sum + nums[i] )
- nums[i] > known_sum, 添加known_sum进数组才能达到最大的范围,所以已知范围更新为:[1,known_sum *2 )
// refer: https://www.hrwhisper.me/leetcode-patching-array/ public int minPatches(int[] nums, int n) { int i = 0; int cnt = 0; long knownSum = 1; while(knownSum <= n) { if(i < nums.length && nums[i] <= knownSum) { knownSum += nums[i]; i++; } else { knownSum *= 2; cnt++; } } return cnt; }