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- #include<stdio.h>
- int main()
- {
- int n;
- scanf("%d",&n);
- long long a,b,i,ans=0;
- scanf("%lld",&a);
- for(i=2;i<=n;i++)
- {
- scanf("%lld",&b);
- if(b-a>0)
- ans+=(b-a);
- a=b;
- }
- printf("%lld",ans);
- return 0;
- }
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