代码

#include<bits/stdc++.h>
using namespace std;
int getint(){
    int ans=0,f=1;
    char c=getchar();
    while(c>'9'||c<'0'){
        if(c=='-')f=-1;
        c=getchar();
    }
    while(c>='0'&&c<='9'){
        ans=ans*10+c-'0';
        c=getchar();
    }
    return ans*f;
}

int main(){
    int n=getint();
    int lst=0,ans=0,mn=1926081700;
    for(int i=0;i<n;i++){
        int x=getint();
        if(lst<x)ans+=x-lst;
        lst=x;
    }
    printf("%d",ans);
    return 0;
}

评测结果