题解 | #寻找峰值#
寻找峰值
https://www.nowcoder.com/practice/fcf87540c4f347bcb4cf720b5b350c76
class Solution { public: /** * 代码中的类名、方法名、参数名已经指定,请勿修改,直接返回方法规定的值即可 * * * @param nums int整型vector * @return int整型 */ int findPeakElement(vector<int>& nums) { int n = nums.size(); int l = 0; int r = n; function<pair<int, int>(int)> get = [&](int i) -> pair<int, int>{ if(i == -1 || i == n) return {0, 0}; else return {1, nums[i]}; }; int res = -1; while(l < r) { int mid = l + (r - l) / 2; if(get(mid) > get(mid - 1) && get(mid) > get(mid + 1)) return mid; if(get(mid) > get(mid + 1)) r = mid; else l = mid + 1; } return res; } };