代码

#include<cstdio>
#include<cstring>
#include<iostream>
#include<algorithm>
# define LL long long
const LL M = 1000005 ;
using namespace std ;
inline LL read() {
    char c = getchar() ; LL x = 0 , w = 1 ;
    while(c>'9'||c<'0') { if(c=='-') w = -1 ; c = getchar() ; }
    while(c>='0'&&c<='9') { x = x*10+c-'0' ; c = getchar() ; }
    return x*w ;
}

LL n ;
LL d[M] , Ans ;
int main() {
    n = read() ;
    for(int i = 1 ; i <= n ; i ++) {
        d[i] = read() ;
        if(d[i] - d[i - 1] > 0)
            Ans += (d[i] - d[i - 1]) ;
    }
    cout << Ans << endl ;
    return 0 ;
}

评测结果