QOJ.ac

QOJ

ID	Problem	Submitter	Result	Time	Memory	Language	File size	Submit time	Judge time
#281124	#6394. Turn on the Light	pisces	AC ✓	4ms	13416kb	C++14	1.4kb	2023-12-09 21:29:25	2023-12-09 21:29:25

Judging History

你现在查看的是最新测评结果

[2023-12-09 21:29:25]
评测

测评结果：AC
用时：4ms
内存：13416kb

查看

[2023-12-09 21:29:25]
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: 3600kb

input:

output:

? 1
? 2
? 3
! 3

result:

ok Correct position at 3

Test #2:

score: 0

Accepted

time: 1ms

memory: 5484kb

input:

output:

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

result:

ok Correct position at 5

Test #3:

score: 0

Accepted

time: 1ms

memory: 5484kb

input:

output:

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

result:

ok Correct position at 4

Test #4:

score: 0

Accepted

time: 1ms

memory: 5484kb

input:

output:

? 2
? 6
? 3
? 4
! 4

result:

ok Correct position at 4

Test #5:

score: 0

Accepted

time: 1ms

memory: 5596kb

input:

output:

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

result:

ok Correct position at 3

Test #6:

score: 0

Accepted

time: 1ms

memory: 5480kb

input:

output:

? 1
? 5
? 2
? 3
! 3

result:

ok Correct position at 3

Test #7:

score: 0

Accepted

time: 1ms

memory: 5480kb

input:

output:

? 1
? 4
? 2
? 3
! 3

result:

ok Correct position at 3

Test #8:

score: 0

Accepted

time: 0ms

memory: 3380kb

input:

4
1
1

output:

? 1
? 3
! 3

result:

ok Correct position at 3

Test #9:

score: 0

Accepted

time: 0ms

memory: 3436kb

input:

3
1
1

output:

? 1
? 2
! 2

result:

ok Correct position at 2

Test #10:

score: 0

Accepted

time: 1ms

memory: 3336kb

input:

2
1
1

output:

? 1
? 2
! 2

result:

ok Correct position at 2

Test #11:

score: 0

Accepted

time: 0ms

memory: 3396kb

input:

1
0

output:

? 1
! 1

result:

ok Correct position at 1

Test #12:

score: 0

Accepted

time: 0ms

memory: 12860kb

input:

output:

result:

ok Correct position at 531243

Test #13:

score: 0

Accepted

time: 3ms

memory: 13336kb

input:

output:

result:

ok Correct position at 503897

Test #14:

score: 0

Accepted

time: 4ms

memory: 12612kb

input:

output:

result:

ok Correct position at 531242

Test #15:

score: 0

Accepted

time: 0ms

memory: 12660kb

input:

output:

result:

ok Correct position at 503896

Test #16:

score: 0

Accepted

time: 4ms

memory: 11688kb

input:

output:

result:

ok Correct position at 531241

Test #17:

score: 0

Accepted

time: 3ms

memory: 12068kb

input:

output:

result:

ok Correct position at 503895

Test #18:

score: 0

Accepted

time: 2ms

memory: 13148kb

input:

output:

result:

ok Correct position at 531240

Test #19:

score: 0

Accepted

time: 4ms

memory: 13072kb

input:

output:

result:

ok Correct position at 503894

Test #20:

score: 0

Accepted

time: 4ms

memory: 12252kb

input:

output:

result:

ok Correct position at 531239

Test #21:

score: 0

Accepted

time: 4ms

memory: 13416kb

input:

output:

result:

ok Correct position at 503893

Test #22:

score: 0

Accepted

time: 0ms

memory: 13056kb

input:

output:

result:

ok Correct position at 43

Test #23:

score: 0

Accepted

time: 0ms

memory: 13324kb

input:

output:

result:

ok Correct position at 51

Test #24:

score: 0

Accepted

time: 0ms

memory: 11384kb

input:

output:

result:

ok Correct position at 51

Test #25:

score: 0

Accepted

time: 3ms

memory: 13304kb

input:

output:

result:

ok Correct position at 51

Test #26:

score: 0

Accepted

time: 3ms

memory: 11748kb

input:

output:

result:

ok Correct position at 999781

Test #27:

score: 0

Accepted

time: 3ms

memory: 11776kb

input:

output:

result:

ok Correct position at 999980

Test #28:

score: 0

Accepted

time: 3ms

memory: 12088kb

input:

output:

result:

ok Correct position at 999979

Test #29:

score: 0

Accepted

time: 3ms

memory: 12080kb

input:

output:

result:

ok Correct position at 999978

Test #30:

score: 0

Accepted

time: 0ms

memory: 12292kb

input:

output:

result:

ok Correct position at 499947

Test #31:

score: 0

Accepted

time: 3ms

memory: 12524kb

input:

output:

result:

ok Correct position at 500070

Test #32:

score: 0

Accepted

time: 0ms

memory: 12244kb

input:

output:

result:

ok Correct position at 500076

Test #33:

score: 0

Accepted

time: 0ms

memory: 12644kb

input:

output:

result:

ok Correct position at 499965

Test #34:

score: 0

Accepted

time: 3ms

memory: 12268kb

input:

output:

result:

ok Correct position at 499991

Test #35:

score: 0

Accepted

time: 3ms

memory: 12068kb

input:

output:

result:

ok Correct position at 499991

Test #36:

score: 0

Accepted

time: 3ms

memory: 11680kb

input:

output:

result:

ok Correct position at 499990

Test #37:

score: 0

Accepted

time: 0ms

memory: 11564kb

input:

output:

result:

ok Correct position at 499990

Test #38:

score: 0

Accepted

time: 3ms

memory: 11632kb

input:

output:

result:

ok Correct position at 1000000

Test #39:

score: 0

Accepted

time: 0ms

memory: 11144kb

input:

output:

result:

ok Correct position at 749999

Test #40:

score: 0

Accepted

time: 3ms

memory: 13220kb

input:

output:

result:

ok Correct position at 624998

Test #41:

score: 0

Accepted

time: 4ms

memory: 13384kb

input:

output:

result:

ok Correct position at 562497

Test #42:

score: 0

Accepted

time: 3ms

memory: 12340kb

input:

output:

result:

ok Correct position at 1000000

Test #43:

score: 0

Accepted

time: 2ms

memory: 12196kb

input:

output:

result:

ok Correct position at 1