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QOJ

ID	Problem	Submitter	Result	Time	Memory	Language	File size	Submit time	Judge time
#177001	#6394. Turn on the Light	xaphoenix^#	AC ✓	2ms	3608kb	C++14	1.8kb	2023-09-12 13:29:58	2023-09-12 13:29:59

Judging History

你现在查看的是最新测评结果

[2023-09-12 13:29:59]
评测

测评结果：AC
用时：2ms
内存：3608kb

查看

[2023-09-12 13:29:58]
提交

answer

#include<bits/stdc++.h>

using namespace std;

#define fi first
#define se second
#define mp make_pair
#define pb push_back
#define pf push_front
#define LC k << 1
#define RC k << 1 | 1
#define IO cin.sync_with_stdio(false); cin.tie(0); cout.tie(0);
#define all(x) (x).begin(), (x).end()
#define SZ(x) ((int)(x).size())
#define rep(i, a, n) for (int i = a; i < n; i++)
#define repn(i, a, n) for (int i = a; i <= n; i++)
#define per(i, a, n) for (int i = (n) - 1; i >= a; i--)
#define pern(i, a, n) for (int i = n; i >= a; i--)

typedef long long LL;
typedef long double LD;
typedef unsigned long long ull;
typedef pair<int, int> PII;
typedef pair<int, LL> PIL;
typedef pair<LL, int> PLI;
typedef pair<double, double> PDD;
typedef pair<ull, ull> PUU;
typedef pair<LL, LL> PLL;

const int N = 110000;
const int M = 1100000;
const int mod = 1e9 + 7;
const int inf = 1e9;
const LL INF = 1e18;
const double eps = 1e-9;

mt19937_64 Rand((unsigned long long)new char);
#define rand Rand

int n, last;
int ask(int x) {
	cout << "? " << x << endl;
	fflush(stdout);
	int res;
	cin >> res;
	return res;
}
int main() {
	IO;
	cin >> n;
	int l = 1, r = n;
	while (l < r) {
		int pre = last;
		int mid = (l + r) / 2;
		int res = ask(mid);
		if (res == last) {
			l = mid;
			break;
		}
		last = res;
		if (mid - l <= r - mid) {
			int res = ask(r);
			if (res == last) {
				l = r;
				break;
			}
			else if (res == pre) {
				l = mid + 1, r = r -1;
			}
			else l = l, r = mid - 1;		
			last = res;
		}
		else {
			int res = ask(l);
			if (res == last) {
				l = l;
				break;
			}
			else if (res == pre) {
				l = l + 1, r = mid - 1;
			}
			else l = mid + 1, r = r;		
			last = res;
		}
	}
	cout << "! " << l << endl;
	fflush(stdout);
	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: 3516kb

input:

3
1
1

output:

? 2
? 3
! 3

result:

ok Correct position at 3

Test #2:

score: 0

Accepted

time: 0ms

memory: 3600kb

input:

output:

? 5
? 10
? 7
? 9
! 8

result:

ok Correct position at 8

Test #3:

score: 0

Accepted

time: 1ms

memory: 3528kb

input:

output:

? 5
? 9
? 2
? 4
! 4

result:

ok Correct position at 4

Test #4:

score: 0

Accepted

time: 0ms

memory: 3388kb

input:

output:

? 4
? 8
? 6
? 7
! 7

result:

ok Correct position at 7

Test #5:

score: 0

Accepted

time: 0ms

memory: 3560kb

input:

output:

? 4
? 7
? 2
? 3
! 1

result:

ok Correct position at 1

Test #6:

score: 0

Accepted

time: 0ms

memory: 3464kb

input:

output:

? 3
? 6
? 4
? 5
! 5

result:

ok Correct position at 5

Test #7:

score: 0

Accepted

time: 0ms

memory: 3608kb

input:

output:

? 3
? 5
? 1
! 1

result:

ok Correct position at 1

Test #8:

score: 0

Accepted

time: 1ms

memory: 3608kb

input:

4
1
1

output:

? 2
? 4
! 4

result:

ok Correct position at 4

Test #9:

score: 0

Accepted

time: 1ms

memory: 3384kb

input:

3
1
1

output:

? 2
? 3
! 3

result:

ok Correct position at 3

Test #10:

score: 0

Accepted

time: 0ms

memory: 3408kb

input:

2
1
1

output:

? 1
? 2
! 2

result:

ok Correct position at 2

Test #11:

score: 0

Accepted

time: 0ms

memory: 3432kb

input:

output:

! 1

result:

ok Correct position at 1

Test #12:

score: 0

Accepted

time: 1ms

memory: 3444kb

input:

output:

result:

ok Correct position at 616155

Test #13:

score: 0

Accepted

time: 2ms

memory: 3456kb

input:

output:

result:

ok Correct position at 116155

Test #14:

score: 0

Accepted

time: 0ms

memory: 3524kb

input:

output:

result:

ok Correct position at 959902

Test #15:

score: 0

Accepted

time: 0ms

memory: 3452kb

input:

output:

result:

ok Correct position at 491152

Test #16:

score: 0

Accepted

time: 1ms

memory: 3460kb

input:

output:

result:

ok Correct position at 741151

Test #17:

score: 0

Accepted

time: 0ms

memory: 3440kb

input:

output:

result:

ok Correct position at 241153

Test #18:

score: 0

Accepted

time: 1ms

memory: 3564kb

input:

output:

result:

ok Correct position at 866149

Test #19:

score: 0

Accepted

time: 1ms

memory: 3372kb

input:

output:

result:

ok Correct position at 366152

Test #20:

score: 0

Accepted

time: 2ms

memory: 3436kb

input:

output:

result:

ok Correct position at 616150

Test #21:

score: 0

Accepted

time: 0ms

memory: 3428kb

input:

output:

result:

ok Correct position at 116154

Test #22:

score: 0

Accepted

time: 0ms

memory: 3424kb

input:

output:

result:

ok Correct position at 43

Test #23:

score: 0

Accepted

time: 1ms

memory: 3432kb

input:

output:

result:

ok Correct position at 51

Test #24:

score: 0

Accepted

time: 1ms

memory: 3380kb

input:

output:

result:

ok Correct position at 51

Test #25:

score: 0

Accepted

time: 1ms

memory: 3520kb

input:

output:

result:

ok Correct position at 51

Test #26:

score: 0

Accepted

time: 1ms

memory: 3528kb

input:

output:

result:

ok Correct position at 999781

Test #27:

score: 0

Accepted

time: 1ms

memory: 3360kb

input:

output:

result:

ok Correct position at 999980

Test #28:

score: 0

Accepted

time: 1ms

memory: 3604kb

input:

output:

result:

ok Correct position at 999979

Test #29:

score: 0

Accepted

time: 1ms

memory: 3544kb

input:

output:

result:

ok Correct position at 999978

Test #30:

score: 0

Accepted

time: 1ms

memory: 3436kb

input:

output:

result:

ok Correct position at 499947

Test #31:

score: 0

Accepted

time: 1ms

memory: 3600kb

input:

output:

result:

ok Correct position at 500070

Test #32:

score: 0

Accepted

time: 1ms

memory: 3564kb

input:

output:

result:

ok Correct position at 500076

Test #33:

score: 0

Accepted

time: 1ms

memory: 3436kb

input:

output:

result:

ok Correct position at 499965

Test #34:

score: 0

Accepted

time: 1ms

memory: 3384kb

input:

output:

result:

ok Correct position at 749984

Test #35:

score: 0

Accepted

time: 0ms

memory: 3424kb

input:

output:

result:

ok Correct position at 499983

Test #36:

score: 0

Accepted

time: 1ms

memory: 3452kb

input:

output:

result:

ok Correct position at 992170

Test #37:

score: 0

Accepted

time: 1ms

memory: 3436kb

input:

output:

result:

ok Correct position at 499982

Test #38:

score: 0

Accepted

time: 0ms

memory: 3604kb

input:

output:

result:

ok Correct position at 8829

Test #39:

score: 0

Accepted

time: 1ms

memory: 3424kb

input:

output:

result:

ok Correct position at 8829

Test #40:

score: 0

Accepted

time: 1ms

memory: 3436kb

input:

output:

result:

ok Correct position at 485387

Test #41:

score: 0

Accepted

time: 1ms

memory: 3600kb

input:

output:

result:

ok Correct position at 485387

Test #42:

score: 0

Accepted

time: 1ms

memory: 3436kb

input:

1000000
1
1

output:

? 500000
? 1000000
! 1000000

result:

ok Correct position at 1000000

Test #43:

score: 0

Accepted

time: 1ms

memory: 3520kb

input:

output:

result:

ok Correct position at 1