每日一题：https://www.luogu.com.cn/problem/P5019

题目链接：https://www.luogu.com.cn/problem/P5019

#include<iostream>
#include<string>
using namespace std;

int main(){
    int n;
    cin>>n;
    int arr[n+1];
    int sum=0;
    arr[0]=0;
    for(int i=1;i<=n;i++){
        cin>>arr[i];
    }
    for(int i=0;i<n;i++){
        arr[i]=arr[i+1]-arr[i];
        if(arr[i]>0){
            sum+=arr[i];
        }
    }
    cout<<sum<<endl;
    return 0;
}