33 lines
355 B
C++
33 lines
355 B
C++
#include<cstdio>
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int n,k;
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int a[1000005];
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void solve()
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{
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int l=0,r=n-1,mid;
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while(l<r)
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{
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mid=(l+r)/2;
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if(a[mid]<k) l=mid+1;
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else r=mid;
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}
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if(a[l]>=k) printf("%d\n",l);
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else printf("-1");
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}
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void init()
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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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scanf("%d",&k);
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}
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int main()
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{
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init();
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solve();
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return 0;
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}
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/*
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5
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2 3 3 5 6
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3
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*/
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