有没有可能用查分就能AC
```cpp
#include <iostream>
using namespace std;
int n, a[100005], b[100005], sum;
int main()
{
cin >> n;
for (int i = 1; i <= n; i++)
{
cin >> a[i];
b[i] = a[i] - a[i-1];
}
for (int i = 1; i <= n; i++)
if (b[i] > 0)
sum += b[i];
cout << sum;
return 0;
}
```
by Spcwl @ 2024-03-28 22:17:28
不好意思，是差分
by Spcwl @ 2024-03-28 22:18:18