lijianyao201602 2017-09-07 22:30:19
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#include<cstdio>
int ans=0,a=0,k,t=0;
int main()
{
int n; scanf("%d",&n);
for(int i=1;i<=n;i++)
{
scanf("%d",&k);
if(k>t) ans+=k-t;
t=k;
}
printf("%d",ans);
return 0;
}