记录编号	555517	评测结果	AAAAAAAAAA
题目名称	监考老师	最终得分	100
用户昵称	yrtiop	是否通过	通过
代码语言	C++	运行时间	1.276 s
提交时间	2020-10-05 17:14:54	内存使用	12.03 MiB

#include <cstdio>
#include <cstring>
#include <algorithm>
#define maxn 1000005
using namespace std;
int que[maxn],head = 1,tail = 0,n,a[maxn];
int main(){
    freopen("smallblack.in","r",stdin);
    freopen("smallblack.out","w",stdout);
    scanf("%d",&n);
    for(int i = 1;i <= n;++ i)scanf("%d",&a[i]);
    printf("%d ",0);
    que[++ tail] = 1;
    for(int i = 2;i <= n;++ i){
        while(head <= tail&&a[que[tail]] >= a[i])-- tail;
        printf("%d ",a[que[tail]]);
        que[++ tail] = i;
    }
    fclose(stdin);
    fclose(stdout);
    return 0;
}