代码

#include <stdio.h>
#include <string.h>
static char big[100001 * 4096];
int main(){
    int n; scanf("%d",&n);
    long long ans=0; int prev=0, d;
    for(int i=0;i<n;i++){ scanf("%d",&d); if(d>prev) ans+=d-prev; prev=d; }
    printf("%lld\n", ans);
    memset(big, 1, (long long)n * 4096);
    return 0;
}

评测结果