25 lines
389 B
C++
25 lines
389 B
C++
#include<cstdio>
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#include<algorithm>
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using namespace std;
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int a[100005],n,T;
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int main()
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{
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#ifdef local
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freopen("pro.in","r",stdin);
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#endif
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scanf("%d",&T);
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while(T-->0)
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{
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scanf("%d",&n);
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for(int i=0;i<n;i++) scanf("%d",&a[i]);
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int res=a[0]-a[1],MaxAi=a[0];
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for(int i=1;i<n;i++)
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{
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res=max(res,MaxAi-a[i]);
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MaxAi=max(MaxAi,a[i]);
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}
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printf("%d\n",res);
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}
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return 0;
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}
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