洛谷P1886 滑动窗口

滑动窗口-链接

单调队列的模板题了~

#include<cstdio>
#define MAXN 10000005
using namespace std;

struct queue{
    int q[MAXN];
    int l,r;
}q,d;

int N,M;

int main(){
    
    scanf("%d%d",&N,&M);
    
    for(register int i=1;i<=N;++i)scanf("%d",&q.q[i]);
    
    q.l=1;q.r=0;
    d.l=1;d.r=0;
    
    for(register int i=1;i<=M;++i){
        int x = q.q[i];
        while(d.l<=d.r&&d.q[d.r]>x)d.r--;
        d.q[++d.r] = x;
    }
    
    for(register int i=M+1;i<=N;++i){
        printf("%d ",d.q[d.l]);
        if(q.q[q.l]==d.q[d.l])d.l++;
        q.l++;
        int x = q.q[i];
        while(d.l<=d.r&&d.q[d.r]>x)d.r--;
        d.q[++d.r] = x;
    }
    printf("%d ",d.q[d.l]);
    puts("");
    
    q.l=1;q.r=0;
    d.l=1;d.r=0;
    
    for(register int i=1;i<=M;++i){
        int x = q.q[i];
        while(d.l<=d.r&&d.q[d.r]<x)d.r--;
        d.q[++d.r] = x;
    }
    
    for(register int i=M+1;i<=N;++i){
        printf("%d ",d.q[d.l]);
        if(q.q[q.l]==d.q[d.l])d.l++;
        q.l++;
        int x = q.q[i];
        while(d.l<=d.r&&d.q[d.r]<x)d.r--;
        d.q[++d.r] = x;
    }
    printf("%d ",d.q[d.l]);
    return 0;
}