样例过了，前面4个wa最后一个TLE，求解

wjz0000000 @ 2024-07-25 09:16:03

#include<iostream>
#include<bits/stdc++.h>
using namespace std;
int a[1000000],n,m,mid;
void cha(int x,int l,int r){
    while(l<=r){
        mid=(l+r)/2;
        if(x==a[mid]){
            while(a[mid]==a[mid-1]){
                mid--;
            }cout<<mid+1<<" ";
            return ;
        }else if(x<a[mid]){
            r=mid-1;
        }else{
            l=mid+1;
        }
    }cout<<-1;
}
int main(){
    cin>>n>>m;
    for(int i=0;i<n;i++){
        cin>>a[i];
    }int x;
    for(int i=0;i<m;i++){
        cin>>x;
        cha(x,0,n);
    }

} 

by yanghanhang @ 2024-07-25 09:19:08

#include<bits/stdc++.h>
using namespace std;
int n,m,g[1000010]; 
int check(int x){
    int l=1,r=n,ans=0;
    while(l<=r){
        int mid=(l+r)/2;
        if(g[mid]>=x){
            r=mid-1;
            ans=mid;
        }
        else l=mid+1;   
    }
    if(g[ans]==x) return ans;
    else return -1;
}
int main(){
    cin>>n>>m;
    for(int i=1;i<=n;i++){
        cin>>g[i];
    }
    for(int i=1;i<=m;i++){
        int x;
        cin>>x;
        cout<<check(x)<<" ";
    }
    return 0;
}

by yanghanhang @ 2024-07-25 09:19:54

试试

by yzlyzl123 @ 2024-08-06 12:47:57

cout<<-1<<" ",-1后面要打空格

by wjz0000000 @ 2024-08-16 08:33:59

谢谢