QOJ.ac

QOJ

IDProblemSubmitterResultTimeMemoryLanguageFile sizeSubmit timeJudge time
#498058#7367. 群岛MSavannah0 21ms8836kbC++142.7kb2024-07-29 22:23:132024-07-29 22:23:13

Judging History

你现在查看的是最新测评结果

  • [2024-07-29 22:23:13]
  • 评测
  • 测评结果:0
  • 用时:21ms
  • 内存:8836kb
  • [2024-07-29 22:23:13]
  • 提交

answer

#include<bits/stdc++.h>
using namespace std;
#define il inline 
il int read()
{
    int xr=0,F=1;char cr;
    while(cr=getchar(),cr<'0'||cr>'9') if(cr=='-') F=-1;
    while(cr>='0'&&cr<='9') xr=(xr<<3)+(xr<<1)+(cr^48),cr=getchar();
    return xr*F;
}
const int N=100010;
int n,m,a[N],opt,x,y;
struct node{int pos,mn,laz;}tr[N<<2];
struct Tree{
    #define ls (k<<1)
    #define rs (k<<1|1)
    #define mid (l+r>>1)
    void build(int k,int l,int r)
    {
        tr[k].pos=r;
        if(l==r){tr[k].mn=0;return ;}
        build(ls,l,mid);build(rs,mid+1,r);
        pushup(k);
    }
    void pushup(int k)
    {
        tr[k].mn=min(tr[ls].mn,tr[rs].mn);
        if(tr[ls].mn<tr[rs].mn) tr[k].pos=tr[ls].pos;
        else tr[k].pos=tr[rs].pos;
    }
    void pushdown(int k)
    {
        tr[ls].mn+=tr[k].laz;tr[ls].laz+=tr[k].laz;
        tr[rs].mn+=tr[k].laz;tr[rs].laz+=tr[k].laz;
        tr[k].laz=0;
    }
    void add(int k,int l,int r,int ql,int qr,int v)
    {
        if(ql<=l&&r<=qr){tr[k].mn+=v,tr[k].laz+=v;return ;}
        pushdown(k);
        if(ql<=mid) add(ls,l,mid,ql,qr,v);
        if(qr>mid) add(rs,mid+1,r,ql,qr,v);
        pushup(k);
    }
    /*int query(int k,int l,int r,int ql,int qr)
    {
        if(ql==l&&r==qr)
        {
            if(!tr[k].mn) return tr[k].r;
            return -1;
        }
        pushdown(k);int res=0;
        if(qr<mid) res=query(ls,l,mid,ql,qr);
        else if(ql>=mid) res=query(rs,mid+1,r,ql,qr);
        else
        {
            int p=query(rs,mid+1,r,mid+1,qr);
            if(p!=-1) res=p;else p=query(ls,l,mid,ql,mid);
        }
        pushup(k);
        return res;
    }*/
    int query(int k,int l,int r,int ql,int qr)
    {
        if(ql<=l&&r<=qr)
        {
            if(!tr[k].mn) return tr[k].pos;
            return -1;
        }
        pushdown(k);int res=0;
        if(qr>mid) res=query(rs,mid+1,r,ql,qr);
        if(res!=-1) return res;
        else res=query(ls,l,mid,ql,qr);
        return res;
    }
}seg;
int main()
{
    // freopen("island.in","r",stdin);
    // freopen("island.out","w",stdout);
    n=read(),m=read();
    seg.build(1,1,n);
    for(int i=1;i<=n;i++) 
    {
        a[i]=read();
        if(a[i]>=i) a[i]=i;
        seg.add(1,1,n,a[i]+1,i,1);
    }
    while(m--)
    {
        opt=read();
        if(opt==1) 
        {
            x=read(),y=read();
            seg.add(1,1,n,a[x]+1,x,-1);
            a[x]=y;
            seg.add(1,1,n,a[x]+1,x,1);
        }
        if(opt==2) 
        {
            x=read();
            int k=seg.query(1,1,n,1,x);
            if(!k) printf("-1\n");
            else printf("%d\n",k);
        }
    }
    return 0;
}

Details

Tip: Click on the bar to expand more detailed information

Subtask #1:

score: 0
Wrong Answer

Test #1:

score: 0
Wrong Answer
time: 0ms
memory: 3708kb

input:

7 7
7 3 2 7 3 5 3
1 3 4
2 4
1 2 6
2 2
2 5
1 5 3
2 3

output:

-1
-1
-1
-1

result:

wrong answer 1st lines differ - expected: '3', found: '-1'

Subtask #2:

score: 0
Wrong Answer

Test #5:

score: 0
Wrong Answer
time: 21ms
memory: 8836kb

input:

100000 100000
100000 1 1 2 4 1 5 4 5 10 6 11 9 9 11 11 15 17 14 16 19 19 19 23 20 21 26 25 26 29 28 27 29 30 32 33 32 36 36 35 39 40 41 41 43 45 44 43 44 117 46 51 48 50 50 52 55 53 54 42 59 61 61 63 94 64 65 64 64 66 68 69 70 69 87 72 72 77 78 75 76 78 78 79 80 84 84 83 84 142 87 87 90 92 80 91 93 ...

output:

-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
...

result:

wrong answer 1st lines differ - expected: '7955', found: '-1'

Subtask #3:

score: 0
Skipped

Dependency #1:

0%