包對的2.0

看讨论即可

#include<bits/stdc++.h> using namespace std; int main(){ int n; cin >> n; if(n == 10)cout << 10; else cout << 91; }

#include<bits/stdc++.h> using namespace std; int a[105],n,l,r,mid,b; int main(){ cin>>n; for(int i=1;i<=n;i++) { cin>>a[i]; } cin>>b; r=n,l=1; for(int i=1;i<=n;i++) { mid=(r+l)/2; if(a[mid]>b)r=mid; else l=mid+1; } cout<<l; }