P3901 数列找不同

合集 - 思维题(99)

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97.P3901 数列找不同2024-04-16

98.P10288 [GESP样题 八级] 区间2024-04-1699.P5677 [GZOI2017] 配对统计2024-04-17

收起

原题链接

题解 1

看代码，最简单的
这叫什么思想？不知道，我暂时叫做信息标记法，但是标记的角度清奇

code1

#include<bits/stdc++.h>
using namespace std;
int late[100005]={0};//离自己最近的相同元素的位置
int maxleft[100005]={0};//最近的一个出现了两次的元素的前一次的位置
int main()
{
    int n,q,x;
    cin>>n>>q;

    for(int i=1;i<=n;i++)
    {
        cin>>x;
        maxleft[i]=max(maxleft[i-1],late[x]);
        late[x]=i;
    }

    while(q--)
    {
        int l,r;
        cin>>l>>r;
        if(maxleft[r]<l) puts("Yes");
        else puts("No");
    }
    return 0;
}