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QOJ

IDProblemSubmitterResultTimeMemoryLanguageFile sizeSubmit timeJudge time
#131665#6394. Turn on the LightzzzYhengAC ✓3ms3760kbC++14942b2023-07-27 20:03:472023-07-27 20:03:50

Judging History

你现在查看的是最新测评结果

  • [2023-08-10 23:21:45]
  • System Update: QOJ starts to keep a history of the judgings of all the submissions.
  • [2023-07-27 20:03:50]
  • 评测
  • 测评结果：AC
  • 用时：3ms
  • 内存：3760kb
查看
  • [2023-07-27 20:03:47]
  • 提交

answer

#include <bits/stdc++.h>

using namespace std; 

int n; 

int query(int pos) {
	cout << "? " << pos << endl; 
	int delta; 
	scanf("%d", &delta); 
	return delta; 
}

void putans(int pos) {
	cout << "! " << pos << endl; 
	exit(0); 
}

void solve(int l, int r, int x, int y) {
	if (l == r) putans(l); 
	int mid = l + r >> 1; 
	int delta = query(mid); 
	if (x != y) {
		if (delta == abs(x - y)) {
			putans(mid); 
		}
		else if (delta == abs(x - y - 1)) {
			solve(l, mid - 1, x, y + 1); 
		}
		else {
			solve(mid + 1, r, x + 1, y); 
		}
	}
	else {
		if (delta == abs(x - y)) {
			putans(mid); 
		}
		if (mid == l) {
			putans(r); 
		}
		int delta = query(l); 
		if (delta == 1) {
			putans(l); 
		}
		if (delta == 0) {
			solve(l + 1, mid - 1, 1, 1); 
		}
		else if (delta == 2) {
			solve(mid + 1, r, 2, 0); 
		}
	}
}

int main() {
	scanf("%d", &n); 
	solve(1, n, 0, 0); 
	return 0; 
}
Source code, Language: C++14

Details

Tip: Click on the bar to expand more detailed information

Test #1:

score: 100
Accepted
time: 0ms
memory: 3760kb

input:

3
1
2

output:

? 2
? 1
! 3

result:

ok Correct position at 3

Test #2:

score: 0
Accepted
time: 0ms
memory: 3756kb

input:

10
1
2
3
3

output:

? 5
? 1
? 8
? 9
! 9

result:

ok Correct position at 9

Test #3:

score: 0
Accepted
time: 0ms
memory: 3520kb

input:

9
1
2
3
3

output:

? 5
? 1
? 7
? 8
! 8

result:

ok Correct position at 8

Test #4:

score: 0
Accepted
time: 1ms
memory: 3512kb

input:

8
1
2
3
3

output:

? 4
? 1
? 6
? 7
! 7

result:

ok Correct position at 7

Test #5:

score: 0
Accepted
time: 0ms
memory: 3516kb

input:

7
1
2
3

output:

? 4
? 1
? 6
! 7

result:

ok Correct position at 7

Test #6:

score: 0
Accepted
time: 0ms
memory: 3572kb

input:

6
1
2
3

output:

? 3
? 1
? 5
! 6

result:

ok Correct position at 6

Test #7:

score: 0
Accepted
time: 1ms
memory: 3508kb

input:

5
1
2
3

output:

? 3
? 1
? 4
! 5

result:

ok Correct position at 5

Test #8:

score: 0
Accepted
time: 0ms
memory: 3532kb

input:

4
1
2
3

output:

? 2
? 1
? 3
! 4

result:

ok Correct position at 4

Test #9:

score: 0
Accepted
time: 0ms
memory: 3544kb

input:

3
1
1

output:

? 2
? 1
! 1

result:

ok Correct position at 1

Test #10:

score: 0
Accepted
time: 1ms
memory: 3468kb

input:

2
1

output:

? 1
! 2

result:

ok Correct position at 2

Test #11:

score: 0
Accepted
time: 1ms
memory: 3464kb

input:

1

output:

! 1

result:

ok Correct position at 1

Test #12:

score: 0
Accepted
time: 2ms
memory: 3752kb

input:

1000000
1
2
3
4
5
6
7
6
7
8
7
8
9
10
11
12
13
14
15
16

output:

? 500000
? 1
? 750000
? 875000
? 937500
? 968750
? 984375
? 992188
? 988281
? 990234
? 991211
? 990722
? 990966
? 991088
? 991149
? 991180
? 991195
? 991203
? 991207
? 991209
! 991210

result:

ok Correct position at 991210

Test #13:

score: 0
Accepted
time: 2ms
memory: 3568kb

input:

999999
1
2
3
2
3
2
1
2
3
4
3
4
5
6
7
8
9
10
11
12

output:

? 500000
? 1
? 750000
? 875000
? 812500
? 843750
? 828125
? 820312
? 824218
? 826171
? 827148
? 826659
? 826903
? 827025
? 827086
? 827117
? 827132
? 827140
? 827144
? 827146
! 827147

result:

ok Correct position at 827147

Test #14:

score: 0
Accepted
time: 3ms
memory: 3572kb

input:

999998
1
2
3
2
3
2
1
2
3
4
3
4
5
6
7
8
9
10
11
12

output:

? 499999
? 1
? 749999
? 874999
? 812499
? 843749
? 828124
? 820311
? 824217
? 826170
? 827147
? 826658
? 826902
? 827024
? 827085
? 827116
? 827131
? 827139
? 827143
? 827145
! 827146

result:

ok Correct position at 827146

Test #15:

score: 0
Accepted
time: 2ms
memory: 3460kb

input:

999997
1
2
3
2
3
2
1
2
3
4
3
4
5
6
7
8
9
10
11
12

output:

? 499999
? 1
? 749998
? 874998
? 812498
? 843748
? 828123
? 820310
? 824216
? 826169
? 827146
? 826657
? 826901
? 827023
? 827084
? 827115
? 827130
? 827138
? 827142
? 827144
! 827145

result:

ok Correct position at 827145

Test #16:

score: 0
Accepted
time: 1ms
memory: 3600kb

input:

999996
1
2
3
2
3
2
1
2
3
4
3
4
5
6
7
8
9
10
11
12

output:

? 499998
? 1
? 749997
? 874997
? 812497
? 843747
? 828122
? 820309
? 824215
? 826168
? 827145
? 826656
? 826900
? 827022
? 827083
? 827114
? 827129
? 827137
? 827141
? 827143
! 827144

result:

ok Correct position at 827144

Test #17:

score: 0
Accepted
time: 2ms
memory: 3604kb

input:

999995
1
2
3
4
5
4
3
4
5
6
5
6
7
8
9
10
11
12
13
14

output:

? 499998
? 1
? 749997
? 874996
? 937496
? 968746
? 953121
? 945308
? 949214
? 951167
? 952144
? 951655
? 951899
? 952021
? 952082
? 952113
? 952128
? 952136
? 952140
? 952142
! 952143

result:

ok Correct position at 952143

Test #18:

score: 0
Accepted
time: 0ms
memory: 3748kb

input:

999994
1
2
3
4
5
4
3
4
5
6
5
6
7
8
9
10
11
12
13
14

output:

? 499997
? 1
? 749996
? 874995
? 937495
? 968745
? 953120
? 945307
? 949213
? 951166
? 952143
? 951654
? 951898
? 952020
? 952081
? 952112
? 952127
? 952135
? 952139
? 952141
! 952142

result:

ok Correct position at 952142

Test #19:

score: 0
Accepted
time: 2ms
memory: 3640kb

input:

999993
1
2
3
4
5
4
3
4
5
6
5
6
7
8
9
10
11
12
13
14

output:

? 499997
? 1
? 749995
? 874994
? 937494
? 968744
? 953119
? 945306
? 949212
? 951165
? 952142
? 951653
? 951897
? 952019
? 952080
? 952111
? 952126
? 952134
? 952138
? 952140
! 952141

result:

ok Correct position at 952141

Test #20:

score: 0
Accepted
time: 2ms
memory: 3508kb

input:

999992
1
2
3
4
5
4
3
4
5
6
5
6
7
8
9
10
11
12
13
14

output:

? 499996
? 1
? 749994
? 874993
? 937493
? 968743
? 953118
? 945305
? 949211
? 951164
? 952141
? 951652
? 951896
? 952018
? 952079
? 952110
? 952125
? 952133
? 952137
? 952139
! 952140

result:

ok Correct position at 952140

Test #21:

score: 0
Accepted
time: 2ms
memory: 3636kb

input:

999991
1
2
3
2
3
2
1
2
3
4
3
4
5
6
7
8
9
10
11
12

output:

? 499996
? 1
? 749994
? 874993
? 812493
? 843743
? 828118
? 820305
? 824211
? 826164
? 827141
? 826652
? 826896
? 827018
? 827079
? 827110
? 827125
? 827133
? 827137
? 827139
! 827140

result:

ok Correct position at 827140

Test #22:

score: 0
Accepted
time: 2ms
memory: 3496kb

input:

1000000
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
0

output:

? 500000
? 1
? 250000
? 2
? 125001
? 3
? 62502
? 4
? 31253
? 5
? 15629
? 6
? 7817
? 7
? 3912
? 8
? 1960
? 9
? 984
? 10
? 497
? 11
? 254
? 12
? 133
? 13
? 73
? 14
? 43
! 43

result:

ok Correct position at 43

Test #23:

score: 0
Accepted
time: 2ms
memory: 3552kb

input:

999999
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
2
1
2
1
0

output:

? 500000
? 1
? 250000
? 2
? 125001
? 3
? 62502
? 4
? 31253
? 5
? 15629
? 6
? 7817
? 7
? 3912
? 8
? 1960
? 9
? 984
? 10
? 497
? 11
? 254
? 12
? 133
? 13
? 73
? 14
? 43
? 15
? 58
? 50
? 54
? 52
! 51

result:

ok Correct position at 51

Test #24:

score: 0
Accepted
time: 3ms
memory: 3528kb

input:

999998
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
2
1
2
1
0

output:

? 499999
? 1
? 250000
? 2
? 125001
? 3
? 62502
? 4
? 31253
? 5
? 15629
? 6
? 7817
? 7
? 3912
? 8
? 1960
? 9
? 984
? 10
? 497
? 11
? 254
? 12
? 133
? 13
? 73
? 14
? 43
? 15
? 58
? 50
? 54
? 52
! 51

result:

ok Correct position at 51

Test #25:

score: 0
Accepted
time: 3ms
memory: 3536kb

input:

999997
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
2
1
2
1
0

output:

? 499999
? 1
? 250000
? 2
? 125001
? 3
? 62502
? 4
? 31253
? 5
? 15629
? 6
? 7817
? 7
? 3912
? 8
? 1960
? 9
? 984
? 10
? 497
? 11
? 254
? 12
? 133
? 13
? 73
? 14
? 43
? 15
? 58
? 50
? 54
? 52
! 51

result:

ok Correct position at 51

Test #26:

score: 0
Accepted
time: 1ms
memory: 3548kb

input:

1000000
1
2
3
4
5
6
7
8
9
10
11
12
13
12
11
10
11
12
11
12

output:

? 500000
? 1
? 750000
? 875000
? 937500
? 968750
? 984375
? 992188
? 996094
? 998047
? 999024
? 999512
? 999756
? 999878
? 999817
? 999786
? 999771
? 999778
? 999782
? 999780
! 999781

result:

ok Correct position at 999781

Test #27:

score: 0
Accepted
time: 2ms
memory: 3516kb

input:

999999
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
15
16
16

output:

? 500000
? 1
? 750000
? 875000
? 937500
? 968750
? 984375
? 992187
? 996093
? 998046
? 999023
? 999511
? 999755
? 999877
? 999938
? 999969
? 999984
? 999976
? 999980
! 999980

result:

ok Correct position at 999980

Test #28:

score: 0
Accepted
time: 1ms
memory: 3748kb

input:

999998
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
15
16
16

output:

? 499999
? 1
? 749999
? 874999
? 937499
? 968749
? 984374
? 992186
? 996092
? 998045
? 999022
? 999510
? 999754
? 999876
? 999937
? 999968
? 999983
? 999975
? 999979
! 999979

result:

ok Correct position at 999979

Test #29:

score: 0
Accepted
time: 1ms
memory: 3536kb

input:

999997
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
15
16
16

output:

? 499999
? 1
? 749998
? 874998
? 937498
? 968748
? 984373
? 992185
? 996091
? 998044
? 999021
? 999509
? 999753
? 999875
? 999936
? 999967
? 999982
? 999974
? 999978
! 999978

result:

ok Correct position at 999978

Test #30:

score: 0
Accepted
time: 1ms
memory: 3748kb

input:

1000000
1
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
13
12
13
12
12

output:

? 500000
? 1
? 250000
? 2
? 375000
? 437500
? 468750
? 484375
? 492187
? 496093
? 498046
? 499023
? 499511
? 499755
? 499877
? 499938
? 499969
? 499953
? 499945
? 499949
? 499947
! 499947

result:

ok Correct position at 499947

Test #31:

score: 0
Accepted
time: 1ms
memory: 3460kb

input:

999999
1
2
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
0

output:

? 500000
? 1
? 750000
? 625000
? 562500
? 500001
? 531250
? 500002
? 515626
? 500003
? 507814
? 500004
? 503909
? 500005
? 501957
? 500006
? 500981
? 500007
? 500494
? 500008
? 500251
? 500009
? 500130
? 500010
? 500070
! 500070

result:

ok Correct position at 500070

Test #32:

score: 0
Accepted
time: 3ms
memory: 3744kb

input:

999998
1
2
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
2
1
0
0

output:

? 499999
? 1
? 749999
? 624999
? 562499
? 500000
? 531249
? 500001
? 515625
? 500002
? 507813
? 500003
? 503908
? 500004
? 501956
? 500005
? 500980
? 500006
? 500493
? 500007
? 500250
? 500008
? 500129
? 500009
? 500069
? 500010
? 500099
? 500084
? 500076
! 500076

result:

ok Correct position at 500076

Test #33:

score: 0
Accepted
time: 0ms
memory: 3572kb

input:

999997
1
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
13
14
15
16
15

output:

? 499999
? 1
? 250000
? 2
? 374999
? 437499
? 468749
? 484374
? 492186
? 496092
? 498045
? 499022
? 499510
? 499754
? 499876
? 499937
? 499968
? 499952
? 499960
? 499964
? 499966
! 499965

result:

ok Correct position at 499965

Test #34:

score: 0
Accepted
time: 3ms
memory: 3548kb

input:

1000000
1
2
3
4
5
6
7
6
7
8
7
8
9
10
11
10
11
10
9
8

output:

? 500000
? 1
? 750000
? 875000
? 937500
? 968750
? 984375
? 992188
? 988281
? 990234
? 991211
? 990722
? 990966
? 991088
? 991149
? 991180
? 991164
? 991172
? 991168
? 991166
! 991165

result:

ok Correct position at 991165

Test #35:

score: 0
Accepted
time: 2ms
memory: 3708kb

input:

999999
1
2
1
0
1
2
1
0
1
2
3
4
3
4
5
6
7
6
7
6
5
4

output:

? 500000
? 1
? 750000
? 625000
? 562500
? 500001
? 593750
? 578125
? 570312
? 562501
? 574218
? 576171
? 577148
? 576659
? 576903
? 577025
? 577086
? 577117
? 577101
? 577109
? 577105
? 577103
! 577102

result:

ok Correct position at 577102

Test #36:

score: 0
Accepted
time: 2ms
memory: 3644kb

input:

999998
1
2
1
0
1
2
1
0
1
2
3
4
3
4
5
6
7
6
7
6
5
4

output:

? 499999
? 1
? 749999
? 624999
? 562499
? 500000
? 593749
? 578124
? 570311
? 562500
? 574217
? 576170
? 577147
? 576658
? 576902
? 577024
? 577085
? 577116
? 577100
? 577108
? 577104
? 577102
! 577101

result:

ok Correct position at 577101

Test #37:

score: 0
Accepted
time: 2ms
memory: 3600kb

input:

999997
1
2
3
2
1
0
1
2
3
4
5
4
5
6
7
8
7
8
7
6
5

output:

? 499999
? 1
? 749998
? 874998
? 812498
? 781248
? 765623
? 749999
? 773435
? 777341
? 779294
? 780271
? 779782
? 780026
? 780148
? 780209
? 780240
? 780224
? 780232
? 780228
? 780226
! 780225

result:

ok Correct position at 780225

Test #38:

score: 0
Accepted
time: 2ms
memory: 3544kb

input:

1000000
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20

output:

? 500000
? 1
? 750000
? 875000
? 937500
? 968750
? 984375
? 992188
? 996094
? 998047
? 999024
? 999512
? 999756
? 999878
? 999939
? 999970
? 999985
? 999993
? 999997
? 999999
! 1000000

result:

ok Correct position at 1000000

Test #39:

score: 0
Accepted
time: 2ms
memory: 3532kb

input:

999999
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20

output:

? 500000
? 1
? 750000
? 875000
? 937500
? 968750
? 984375
? 992187
? 996093
? 998046
? 999023
? 999511
? 999755
? 999877
? 999938
? 999969
? 999984
? 999992
? 999996
? 999998
! 999999

result:

ok Correct position at 999999

Test #40:

score: 0
Accepted
time: 2ms
memory: 3528kb

input:

999998
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20

output:

? 499999
? 1
? 749999
? 874999
? 937499
? 968749
? 984374
? 992186
? 996092
? 998045
? 999022
? 999510
? 999754
? 999876
? 999937
? 999968
? 999983
? 999991
? 999995
? 999997
! 999998

result:

ok Correct position at 999998

Test #41:

score: 0
Accepted
time: 2ms
memory: 3536kb

input:

999997
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20

output:

? 499999
? 1
? 749998
? 874998
? 937498
? 968748
? 984373
? 992185
? 996091
? 998044
? 999021
? 999509
? 999753
? 999875
? 999936
? 999967
? 999982
? 999990
? 999994
? 999996
! 999997

result:

ok Correct position at 999997

Test #42:

score: 0
Accepted
time: 2ms
memory: 3640kb

input:

1000000
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20

output:

? 500000
? 1
? 750000
? 875000
? 937500
? 968750
? 984375
? 992188
? 996094
? 998047
? 999024
? 999512
? 999756
? 999878
? 999939
? 999970
? 999985
? 999993
? 999997
? 999999
! 1000000

result:

ok Correct position at 1000000

Test #43:

score: 0
Accepted
time: 1ms
memory: 3508kb

input:

1000000
1
1

output:

? 500000
? 1
! 1

result:

ok Correct position at 1
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Server Time: 2024-12-02 16:53:46 | OpenSource Project