78 lines
1.4 KiB
C++
78 lines
1.4 KiB
C++
#include<cstdio>
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#include<iostream>
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#include<algorithm>
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#include<cstring>
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#include<cmath>
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#include<queue>
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#include<map>
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using namespace std;
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#define MOD 1000000007
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const int INF=0x3f3f3f3f;
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const double eps=1e-5;
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typedef long long ll;
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#define cl(a) memset(a,0,sizeof(a))
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#define ts printf("*****\n");
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const int MAXN=100005;
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int n,m,tt;
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int a[MAXN],b[MAXN];
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bool check(int mid)
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{
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for(int i=1;i<=n;i++)
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{
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b[i]=a[i];
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}
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for(int i=1;i<=n;i++)
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{
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if(i==1)
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{
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b[i]-=mid;
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continue;
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}
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if(b[i]<=b[i-1])
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{
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if((b[i-1]+1)-b[i]<=mid)
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b[i]=b[i-1]+1;
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else
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{
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return 0;
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}
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}
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if(b[i]-mid>b[i-1])
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{
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b[i]=b[i]-mid;
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}
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else
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{
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b[i]=b[i-1]+1;
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}
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}
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return 1;
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}
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int main()
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{
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int i,j,k;
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int ca=1;
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scanf("%d",&tt);
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while(tt--)
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{
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printf("Case #%d:\n",ca++);
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scanf("%d",&n);
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for(i=1;i<=n;i++) scanf("%d",a+i);
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int l=0;
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int r=1000005;
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int ans=0;
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while(l<=r)
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{
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int mid=(l+r)>>1;
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if(check(mid))
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{
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ans=mid;
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r=mid-1;
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}
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else
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l=mid+1;
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}
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printf("%d\n",ans);
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}
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}
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