思路:

贪心。

实现:

 1 class Solution
 2 {
 3 public:
 4     int minimumEffort(vector<vector<int>>& tasks)
 5     {
 6         int n = tasks.size(), sum = 0;
 7         for (int i = 0; i < n; i++)
 8         {
 9             sum += tasks[i][0];
10         }
11         sort(tasks.begin(), tasks.end(), 
12             [](const vector<int>& a, const vector<int>& b) { return a[1] - a[0] > b[1] - b[0]; });
13         int res = sum;
14         for (int i = 0; i < n; i++)
15         {
16             if (sum < tasks[i][1]) { res += tasks[i][1] - sum; sum = tasks[i][1]; }
17             sum -= tasks[i][0];
18         }
19         return res;
20     }
21 };

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