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QOJ

ID	Problem	Submitter	Result	Time	Memory	Language	File size	Submit time	Judge time
#470381	#6394. Turn on the Light	UESTC_xxx^#	AC ✓	1ms	3688kb	C++14	769b	2024-07-10 12:29:33	2024-07-10 12:29:34

Judging History

你现在查看的是最新测评结果

[2024-07-10 12:29:34]
评测

测评结果：AC
用时：1ms
内存：3688kb

查看

[2024-07-10 12:29:33]
提交

answer

#include<iostream>
#include<cstdio>
using namespace std;
inline int read(){
	char ch=getchar();
	int ty=1,k=0;
	while(ch<'0'||ch>'9'){
		if(ch=='-')ty=-1;
		ch=getchar();
	}
	while(ch<='9'&&ch>='0'){
		k=k*10+ch-'0';
		ch=getchar();
	}
	return ty*ch;
}
int n;
int main(){
	cin>>n;
	int l=1,r=n;
	int last=0,ans=0,ans1=0;
	while(l<r){
		int mid=l+r>>1;
		cout<<'?'<<' '<<mid<<'\n';
		cin>>ans;
		if(ans==last){
			cout<<'!'<<' '<<mid<<'\n';
			cout.flush();
			return 0;
		}
		cout<<'?'<<' '<<r<<'\n';
		cin>>ans1;
		if(ans1==ans){
			cout<<'!'<<' '<<r<<'\n';
			cout.flush();
			return 0;
		}
		if(ans1==last){
			l=mid+1;
			r=r-1;
		}
		else r=mid-1;
		last=ans1;
	}
	cout<<'!'<<' '<<l<<'\n';
	cout.flush();
	return 0;
}

Source code, Language: C++14

Details

Tip: Click on the bar to expand more detailed information

Test #1:

score: 100

Accepted

time: 1ms

memory: 3624kb

input:

3
1
1

output:

? 2
? 3
! 3

result:

ok Correct position at 3

Test #2:

score: 0

Accepted

time: 1ms

memory: 3532kb

input:

output:

? 5
? 10
? 7
? 9
! 8

result:

ok Correct position at 8

Test #3:

score: 0

Accepted

time: 1ms

memory: 3684kb

input:

output:

? 5
? 9
? 2
? 4
! 4

result:

ok Correct position at 4

Test #4:

score: 0

Accepted

time: 1ms

memory: 3592kb

input:

output:

? 4
? 8
? 6
? 7
! 7

result:

ok Correct position at 7

Test #5:

score: 0

Accepted

time: 1ms

memory: 3668kb

input:

output:

? 4
? 7
? 2
? 3
! 1

result:

ok Correct position at 1

Test #6:

score: 0

Accepted

time: 1ms

memory: 3600kb

input:

output:

? 3
? 6
? 4
? 5
! 5

result:

ok Correct position at 5

Test #7:

score: 0

Accepted

time: 1ms

memory: 3660kb

input:

output:

? 3
? 5
? 1
! 1

result:

ok Correct position at 1

Test #8:

score: 0

Accepted

time: 1ms

memory: 3620kb

input:

4
1
1

output:

? 2
? 4
! 4

result:

ok Correct position at 4

Test #9:

score: 0

Accepted

time: 0ms

memory: 3656kb

input:

3
1
1

output:

? 2
? 3
! 3

result:

ok Correct position at 3

Test #10:

score: 0

Accepted

time: 0ms

memory: 3600kb

input:

2
1
1

output:

? 1
? 2
! 2

result:

ok Correct position at 2

Test #11:

score: 0

Accepted

time: 1ms

memory: 3604kb

input:

output:

! 1

result:

ok Correct position at 1

Test #12:

score: 0

Accepted

time: 1ms

memory: 3556kb

input:

output:

result:

ok Correct position at 616155

Test #13:

score: 0

Accepted

time: 1ms

memory: 3604kb

input:

output:

result:

ok Correct position at 116155

Test #14:

score: 0

Accepted

time: 1ms

memory: 3676kb

input:

output:

result:

ok Correct position at 959902

Test #15:

score: 0

Accepted

time: 1ms

memory: 3556kb

input:

output:

result:

ok Correct position at 491152

Test #16:

score: 0

Accepted

time: 0ms

memory: 3652kb

input:

output:

result:

ok Correct position at 741151

Test #17:

score: 0

Accepted

time: 0ms

memory: 3552kb

input:

output:

result:

ok Correct position at 241153

Test #18:

score: 0

Accepted

time: 0ms

memory: 3624kb

input:

output:

result:

ok Correct position at 866149

Test #19:

score: 0

Accepted

time: 1ms

memory: 3688kb

input:

output:

result:

ok Correct position at 366152

Test #20:

score: 0

Accepted

time: 1ms

memory: 3548kb

input:

output:

result:

ok Correct position at 616150

Test #21:

score: 0

Accepted

time: 1ms

memory: 3596kb

input:

output:

result:

ok Correct position at 116154

Test #22:

score: 0

Accepted

time: 0ms

memory: 3676kb

input:

output:

result:

ok Correct position at 43

Test #23:

score: 0

Accepted

time: 1ms

memory: 3560kb

input:

output:

result:

ok Correct position at 51

Test #24:

score: 0

Accepted

time: 1ms

memory: 3592kb

input:

output:

result:

ok Correct position at 51

Test #25:

score: 0

Accepted

time: 1ms

memory: 3540kb

input:

output:

result:

ok Correct position at 51

Test #26:

score: 0

Accepted

time: 0ms

memory: 3560kb

input:

output:

result:

ok Correct position at 999781

Test #27:

score: 0

Accepted

time: 1ms

memory: 3560kb

input:

output:

result:

ok Correct position at 999980

Test #28:

score: 0

Accepted

time: 1ms

memory: 3676kb

input:

output:

result:

ok Correct position at 999979

Test #29:

score: 0

Accepted

time: 0ms

memory: 3600kb

input:

output:

result:

ok Correct position at 999978

Test #30:

score: 0

Accepted

time: 1ms

memory: 3664kb

input:

output:

result:

ok Correct position at 499947

Test #31:

score: 0

Accepted

time: 1ms

memory: 3596kb

input:

output:

result:

ok Correct position at 500070

Test #32:

score: 0

Accepted

time: 1ms

memory: 3552kb

input:

output:

result:

ok Correct position at 500076

Test #33:

score: 0

Accepted

time: 1ms

memory: 3592kb

input:

output:

result:

ok Correct position at 499965

Test #34:

score: 0

Accepted

time: 1ms

memory: 3536kb

input:

output:

result:

ok Correct position at 749984

Test #35:

score: 0

Accepted

time: 1ms

memory: 3608kb

input:

output:

result:

ok Correct position at 499983

Test #36:

score: 0

Accepted

time: 1ms

memory: 3552kb

input:

output:

result:

ok Correct position at 992170

Test #37:

score: 0

Accepted

time: 1ms

memory: 3560kb

input:

output:

result:

ok Correct position at 499982

Test #38:

score: 0

Accepted

time: 0ms

memory: 3620kb

input:

output:

result:

ok Correct position at 8829

Test #39:

score: 0

Accepted

time: 1ms

memory: 3680kb

input:

output:

result:

ok Correct position at 8829

Test #40:

score: 0

Accepted

time: 0ms

memory: 3604kb

input:

output:

result:

ok Correct position at 485387

Test #41:

score: 0

Accepted

time: 1ms

memory: 3684kb

input:

output:

result:

ok Correct position at 485387

Test #42:

score: 0

Accepted

time: 1ms

memory: 3604kb

input:

1000000
1
1

output:

? 500000
? 1000000
! 1000000

result:

ok Correct position at 1000000

Test #43:

score: 0

Accepted

time: 0ms

memory: 3596kb

input:

output:

result:

ok Correct position at 1