QOJ.ac

QOJ

ID	Problem	Submitter	Result	Time	Memory	Language	File size	Submit time	Judge time
#138377	#6394. Turn on the Light	Schi2oid	AC ✓	5ms	13592kb	C++14	1.1kb	2023-08-11 16:52:49	2023-08-11 16:52:52

Judging History

你现在查看的是最新测评结果

[2023-08-11 16:52:52]
评测

测评结果：AC
用时：5ms
内存：13592kb

查看

[2023-08-11 16:52:49]
提交

answer

#include <bits/stdc++.h>
using namespace std;

int ask(int x) {
	int ret;
	cout << "? " << x << endl;
	cin >> ret;
	return ret;
	}
int id[2][2000005];

int main() {
	int n;
	cin >> n;
	for (int i = 1; i <= n; i++)
		id[0][i] = i;
	bool op = 0;
	int bef = 0;
	while (n >= 4) {
		int p1 = n / 4, p2 = n - n / 4;
		int x = ask(id[op][p1]);
		if (x == bef) {
			cout << "! " << id[op][p1];
			return 0;
			}
		int y = ask(id[op][p2]);
		if (y == x) {
			cout << "! " << id[op][p2];
			return 0;
			}
		int delta = y - bef;
		op ^= 1;
		if (delta == 0) {
			int cnt = 0;
			for (int i = p1 + 1; i < p2; i++) {
				id[op][++cnt] = id[op ^ 1][i];
				}
			n = cnt;
			}
		else {
			int cnt = 0;
			for (int i = 1; i < p1; i++) {
				id[op][++cnt] = id[op ^ 1][i];
				}
			for (int i = p2 + 1; i <= n; i++) {
				id[op][++cnt] = id[op ^ 1][i];
				}
			n = cnt;
			}
		bef = y;
		}
	for (int i = 1; i <= n; i++) {
		int x = ask(id[op][i]);
		if (x == bef) {
			cout << "! " << id[op][i];
			return 0;
			}
		bef = x;
		}
	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: 3464kb

input:

output:

? 1
? 2
? 3
! 3

result:

ok Correct position at 3

Test #2:

score: 0

Accepted

time: 2ms

memory: 5460kb

input:

output:

? 2
? 8
? 3
? 6
? 4
? 5
! 5

result:

ok Correct position at 5

Test #3:

score: 0

Accepted

time: 2ms

memory: 5392kb

input:

output:

? 2
? 7
? 3
? 5
? 4
! 4

result:

ok Correct position at 4

Test #4:

score: 0

Accepted

time: 1ms

memory: 5388kb

input:

output:

? 2
? 6
? 3
? 4
! 4

result:

ok Correct position at 4

Test #5:

score: 0

Accepted

time: 2ms

memory: 5496kb

input:

output:

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

result:

ok Correct position at 3

Test #6:

score: 0

Accepted

time: 1ms

memory: 5456kb

input:

output:

? 1
? 5
? 2
? 3
! 3

result:

ok Correct position at 3

Test #7:

score: 0

Accepted

time: 0ms

memory: 5472kb

input:

output:

? 1
? 4
? 2
? 3
! 3

result:

ok Correct position at 3

Test #8:

score: 0

Accepted

time: 1ms

memory: 3624kb

input:

4
1
1

output:

? 1
? 3
! 3

result:

ok Correct position at 3

Test #9:

score: 0

Accepted

time: 2ms

memory: 3620kb

input:

3
1
1

output:

? 1
? 2
! 2

result:

ok Correct position at 2

Test #10:

score: 0

Accepted

time: 1ms

memory: 3376kb

input:

2
1
1

output:

? 1
? 2
! 2

result:

ok Correct position at 2

Test #11:

score: 0

Accepted

time: 1ms

memory: 3444kb

input:

1
0

output:

? 1
! 1

result:

ok Correct position at 1

Test #12:

score: 0

Accepted

time: 2ms

memory: 12968kb

input:

output:

result:

ok Correct position at 531243

Test #13:

score: 0

Accepted

time: 3ms

memory: 13592kb

input:

output:

result:

ok Correct position at 503897

Test #14:

score: 0

Accepted

time: 2ms

memory: 11576kb

input:

output:

result:

ok Correct position at 531242

Test #15:

score: 0

Accepted

time: 2ms

memory: 13200kb

input:

output:

result:

ok Correct position at 503896

Test #16:

score: 0

Accepted

time: 3ms

memory: 12376kb

input:

output:

result:

ok Correct position at 531241

Test #17:

score: 0

Accepted

time: 2ms

memory: 13080kb

input:

output:

result:

ok Correct position at 503895

Test #18:

score: 0

Accepted

time: 5ms

memory: 11700kb

input:

output:

result:

ok Correct position at 531240

Test #19:

score: 0

Accepted

time: 2ms

memory: 12732kb

input:

output:

result:

ok Correct position at 503894

Test #20:

score: 0

Accepted

time: 2ms

memory: 11836kb

input:

output:

result:

ok Correct position at 531239

Test #21:

score: 0

Accepted

time: 5ms

memory: 13436kb

input:

output:

result:

ok Correct position at 503893

Test #22:

score: 0

Accepted

time: 1ms

memory: 11184kb

input:

output:

result:

ok Correct position at 43

Test #23:

score: 0

Accepted

time: 0ms

memory: 12584kb

input:

output:

result:

ok Correct position at 51

Test #24:

score: 0

Accepted

time: 0ms

memory: 11092kb

input:

output:

result:

ok Correct position at 51

Test #25:

score: 0

Accepted

time: 5ms

memory: 12892kb

input:

output:

result:

ok Correct position at 51

Test #26:

score: 0

Accepted

time: 5ms

memory: 11888kb

input:

output:

result:

ok Correct position at 999781

Test #27:

score: 0

Accepted

time: 1ms

memory: 11800kb

input:

output:

result:

ok Correct position at 999980

Test #28:

score: 0

Accepted

time: 2ms

memory: 13236kb

input:

output:

result:

ok Correct position at 999979

Test #29:

score: 0

Accepted

time: 4ms

memory: 12196kb

input:

output:

result:

ok Correct position at 999978

Test #30:

score: 0

Accepted

time: 2ms

memory: 13460kb

input:

output:

result:

ok Correct position at 499947

Test #31:

score: 0

Accepted

time: 2ms

memory: 13340kb

input:

output:

result:

ok Correct position at 500070

Test #32:

score: 0

Accepted

time: 0ms

memory: 11768kb

input:

output:

result:

ok Correct position at 500076

Test #33:

score: 0

Accepted

time: 1ms

memory: 11176kb

input:

output:

result:

ok Correct position at 499965

Test #34:

score: 0

Accepted

time: 4ms

memory: 12064kb

input:

output:

result:

ok Correct position at 499991

Test #35:

score: 0

Accepted

time: 3ms

memory: 11524kb

input:

output:

result:

ok Correct position at 499991

Test #36:

score: 0

Accepted

time: 0ms

memory: 13328kb

input:

output:

result:

ok Correct position at 499990

Test #37:

score: 0

Accepted

time: 0ms

memory: 12552kb

input:

output:

result:

ok Correct position at 499990

Test #38:

score: 0

Accepted

time: 4ms

memory: 12304kb

input:

output:

result:

ok Correct position at 1000000

Test #39:

score: 0

Accepted

time: 5ms

memory: 13352kb

input:

output:

result:

ok Correct position at 749999

Test #40:

score: 0

Accepted

time: 1ms

memory: 11752kb

input:

output:

result:

ok Correct position at 624998

Test #41:

score: 0

Accepted

time: 4ms

memory: 12936kb

input:

output:

result:

ok Correct position at 562497

Test #42:

score: 0

Accepted

time: 1ms

memory: 11792kb

input:

output:

result:

ok Correct position at 1000000

Test #43:

score: 0

Accepted

time: 0ms

memory: 12420kb

input:

output:

result:

ok Correct position at 1