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IDProblemSubmitterResultTimeMemoryLanguageFile sizeSubmit timeJudge time
#876167#9734. Identify ChordLuluWA 4ms3712kbC++142.5kb2025-01-30 17:57:142025-01-30 17:57:16

Judging History

你现在查看的是最新测评结果

  • [2025-01-30 17:57:16]
  • 评测
  • 测评结果:WA
  • 用时:4ms
  • 内存:3712kb
  • [2025-01-30 17:57:14]
  • 提交

answer

/*
Author:
Homework:QH01
Problem:identify
Time:2025 - 1 - 30
Calm down!
Think twice and type.
*/
#include<bits/stdc++.h>
#define REP(i,l,r) for(int i=(l);i<=(r);i++)
#define PER(i,r,l) for(int i=(r);i>=(l);i--)
#define pi pair<int,int>
#define mkp(x,y) make_pair(x,y)
#define fi first
#define se second
#define ll long long
#define lc tr[i].ch[0]
#define rc tr[i].ch[1]
#define Lc tr[j].ch[0]
#define Rc tr[j].ch[1]
#define lowbit(i) (i&(-i))
using namespace std;
inline int read(){
    int x=0,f=1;
    char c=getchar();
    while(!isdigit(c)){
        if(c=='-')f=-1;
        c=getchar();
    }
    while(isdigit(c)){
        x=(x<<3)+(x<<1)+c-'0';
        c=getchar();
    }
    return x*f;
}
void write(int x){
    if(x<0)putchar('-'),x=-x;
    if(x>9)write(x/10);
    putchar(x%10+'0');
}
int getrand(int mod){
    ll x=0;
    x<<=15,x+=rand();
    x<<=15,x+=rand();
    x<<=15,x+=rand();
    return x%mod+1;
}
int cnt;
int query(int x,int y){
    if(++cnt>40)exit(0);
    putchar('?'),putchar(' ');
    write(x),putchar(' ');
    write(y),putchar('\n');
    fflush(stdout);
    return read();
}
void print(int x,int y){
    putchar('!'),putchar(' ');
    write(x),putchar(' ');
    write(y),putchar('\n');
    fflush(stdout);
    int res=read();
    if(res==-1)exit(0);
}
int n,ans;
bool check(int x,int y){
    if(y<x)swap(x,y);
    int dis=min(y-x,x+n-y);
    ans=query(x,y);
    return ans!=dis;
}
void solve(){
    cnt=0;
    n=read();
    int x=getrand(n),y=x+1+getrand(n-3);if(y>n)y-=n;
    while(!check(x,y)){
        x=getrand(n),y=x+1+getrand(n-3);
        if(y>n)y-=n;
    }
    if(x>y)swap(x,y);
    bool dirx=0,diry=0;
    if(query(x%n+1,y)==ans-1)dirx=1;
    if(query(x,y%n+1)==ans-1)diry=1;
    if(dirx){
        int l=x+1,r=y-1,res=x;
        while(l<=r){
            int mid=(l+r)/2;
            if(query(mid,y)==ans-(mid-x))res=mid,l=mid+1;
            else r=mid-1;
        }
        ans-=res-x+1,x=res;
    }else{
        int l=y+1,r=n+x-1,res=n+x;
        while(l<=r){
            int mid=(l+r)/2;int v=mid;if(v>n)v-=n;
            if(query(v,y)==ans-(n+x-mid))res=mid,r=mid-1;
            else l=mid+1;
        }
        ans-=(n+x)-res+1,x=res;
    }
    if(diry)y+=ans;
    else y+=n-ans;
    if(x>n)x-=n;
    if(y>n)y-=n;
    print(x,y);
}
int main(){
    srand(time(0));
    // freopen("identify.in","r",stdin);
    // freopen("identify.out","w",stdout);
    int T=read();
    while(T--)solve();
    return 0;
}

Details

Tip: Click on the bar to expand more detailed information

Test #1:

score: 100
Accepted
time: 0ms
memory: 3584kb

input:

2
6
2
2
2
2
2
1
2
1
4
2
2
1
1
1
1
1

output:

? 3 5
? 1 3
? 2 5
? 3 5
? 2 6
? 6 5
? 1 5
! 2 4
? 2 4
? 2 4
? 1 3
? 2 3
? 1 4
? 4 3
! 1 3

result:

ok ok (2 test cases)

Test #2:

score: -100
Wrong Answer
time: 4ms
memory: 3712kb

input:

1000
15
6
6
5
4
6
7
1
19
5
4
4
4
5
4
1
17
3
2
4
5
3
2
1
15
4
2
5
6
7
5
3
5
6
1
14
3
4
2
1
3
2
1
1
15
5
4
4
3
4
4
1
17
6
5
3
5
6
6
4
2
3
1
20
3
7
8
6
5
6
5
1
13
4
3
5
6
5
2
4
4
5
2
2
1
1
18
4
6
5
5
3
4
3
2
1
13
4
5
3
3
2
3
1
14
2
3
4
4
3
3
2
1
17
6
5
6
1
3
2
1
12
4
4
2
3
4
4
3
3
2
1
10
2
2
3
3
2
3
2
...

output:

? 8 15
? 9 15
? 8 1
? 4 15
? 6 15
? 7 15
! 8 5
? 11 19
? 12 19
? 11 1
? 15 19
? 13 19
? 12 19
! 12 3
? 2 12
? 3 12
? 2 13
? 7 12
? 4 12
? 3 12
! 3 11
? 3 7
? 6 8
? 8 13
? 3 11
? 4 11
? 3 12
? 14 11
? 1 11
? 2 11
! 3 1
? 10 13
? 1 11
? 1 5
? 2 5
? 1 6
? 3 5
? 2 5
! 2 5
? 8 14
? 9 14
? 8 15
? 11 14
? ...

result:

wrong answer format  Unexpected end of file - token expected (test case 404)