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QOJ

ID	题目	提交者	结果	用时	内存	语言	文件大小	提交时间	测评时间
#574752	#6394. Turn on the Light	GammaRays	AC ✓	2ms	3732kb	C++23	1002b	2024-09-19 00:16:01	2024-09-19 00:16:02

Judging History

你现在查看的是最新测评结果

[2024-09-19 00:16:02]
评测

测评结果：AC
用时：2ms
内存：3732kb

查看

[2024-09-19 00:16:01]
提交

answer

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

void answer(int x) {
    cout << '!' << ' ' << x << endl;
    exit(0);
}

int ask(int x) {
    cout << '?' << ' ' << x << endl;
    int ret;
    cin >> ret;
    return ret;
}
int n;
int L = 1;
int R = n;
int LST = 0;

void solve(int l, int r, int lst) {
    L = l;
    R = r;
    LST = lst;
    if (l + 1 < r) {

    } else {
        return;
    }
    int x = ask(r);
    if(x == lst) {
        answer(r);
    }
    r --;
    int mid = (l + r) >> 1;
    int y = ask(mid);
    if(y == x) {
        answer(mid);
    }
    if(x < y) {
        solve(l, mid - 1, y);
    }
    //0 1 1
    else {
        solve(mid + 1, r, y);
    }
    return;
}

int main() {
    cin >> n;
    L = 1, R = n;
    solve(1, n, 0);
    // cout << L << ' ' << R << endl;
    int res = ask(L);
    if (res == LST) {
        answer(L);
    } 
    LST = res;
    if (ask(R) == LST){
        answer(R);
    }
    return 0;
}

源文件, 语言: C++23

詳細信息

Test #1:

score: 100

Accepted

time: 1ms

memory: 3660kb

input:

3
0

output:

? 3
! 3

result:

ok Correct position at 3

Test #2:

score: 0

Accepted

time: 1ms

memory: 3728kb

input:

output:

? 10
? 5
? 9
? 7
? 8
! 8

result:

ok Correct position at 8

Test #3:

score: 0

Accepted

time: 0ms

memory: 3644kb

input:

output:

? 9
? 4
? 8
? 6
? 7
! 7

result:

ok Correct position at 7

Test #4:

score: 0

Accepted

time: 1ms

memory: 3644kb

input:

output:

? 8
? 4
? 7
? 5
? 6
! 6

result:

ok Correct position at 6

Test #5:

score: 0

Accepted

time: 0ms

memory: 3644kb

input:

output:

? 7
? 3
? 6
? 4
? 5
! 5

result:

ok Correct position at 5

Test #6:

score: 0

Accepted

time: 0ms

memory: 3576kb

input:

output:

? 6
? 3
? 4
? 5
! 5

result:

ok Correct position at 5

Test #7:

score: 0

Accepted

time: 0ms

memory: 3728kb

input:

output:

? 5
? 2
? 3
? 4
! 4

result:

ok Correct position at 4

Test #8:

score: 0

Accepted

time: 0ms

memory: 3632kb

input:

4
1
1

output:

? 4
? 2
! 2

result:

ok Correct position at 2

Test #9:

score: 0

Accepted

time: 1ms

memory: 3588kb

input:

output:

? 3
? 1
? 2
! 2

result:

ok Correct position at 2

Test #10:

score: 0

Accepted

time: 0ms

memory: 3644kb

input:

2
1
1

output:

? 1
? 2
! 2

result:

ok Correct position at 2

Test #11:

score: 0

Accepted

time: 0ms

memory: 3580kb

input:

1
0

output:

? 1
! 1

result:

ok Correct position at 1

Test #12:

score: 0

Accepted

time: 1ms

memory: 3704kb

input:

output:

result:

ok Correct position at 992137

Test #13:

score: 0

Accepted

time: 1ms

memory: 3720kb

input:

output:

result:

ok Correct position at 992136

Test #14:

score: 0

Accepted

time: 1ms

memory: 3636kb

input:

output:

result:

ok Correct position at 968698

Test #15:

score: 0

Accepted

time: 2ms

memory: 3588kb

input:

output:

result:

ok Correct position at 968697

Test #16:

score: 0

Accepted

time: 0ms

memory: 3648kb

input:

output:

result:

ok Correct position at 968696

Test #17:

score: 0

Accepted

time: 0ms

memory: 3728kb

input:

output:

result:

ok Correct position at 968695

Test #18:

score: 0

Accepted

time: 1ms

memory: 3628kb

input:

output:

result:

ok Correct position at 968694

Test #19:

score: 0

Accepted

time: 1ms

memory: 3644kb

input:

output:

result:

ok Correct position at 968693

Test #20:

score: 0

Accepted

time: 0ms

memory: 3652kb

input:

output:

result:

ok Correct position at 968692

Test #21:

score: 0

Accepted

time: 0ms

memory: 3724kb

input:

output:

result:

ok Correct position at 968691

Test #22:

score: 0

Accepted

time: 1ms

memory: 3660kb

input:

output:

result:

ok Correct position at 43

Test #23:

score: 0

Accepted

time: 1ms

memory: 3632kb

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: 3592kb

input:

output:

result:

ok Correct position at 51

Test #26:

score: 0

Accepted

time: 0ms

memory: 3644kb

input:

output:

result:

ok Correct position at 999781

Test #27:

score: 0

Accepted

time: 1ms

memory: 3732kb

input:

output:

result:

ok Correct position at 999980

Test #28:

score: 0

Accepted

time: 1ms

memory: 3576kb

input:

output:

result:

ok Correct position at 999979

Test #29:

score: 0

Accepted

time: 1ms

memory: 3600kb

input:

output:

result:

ok Correct position at 999978

Test #30:

score: 0

Accepted

time: 0ms

memory: 3584kb

input:

output:

result:

ok Correct position at 499947

Test #31:

score: 0

Accepted

time: 1ms

memory: 3704kb

input:

output:

result:

ok Correct position at 500070

Test #32:

score: 0

Accepted

time: 1ms

memory: 3712kb

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: 3584kb

input:

output:

result:

ok Correct position at 999981

Test #35:

score: 0

Accepted

time: 1ms

memory: 3584kb

input:

output:

result:

ok Correct position at 999980

Test #36:

score: 0

Accepted

time: 0ms

memory: 3568kb

input:

output:

result:

ok Correct position at 999979

Test #37:

score: 0

Accepted

time: 1ms

memory: 3576kb

input:

output:

result:

ok Correct position at 999978

Test #38:

score: 0

Accepted

time: 1ms

memory: 3728kb

input:

output:

result:

ok Correct position at 491153

Test #39:

score: 0

Accepted

time: 1ms

memory: 3584kb

input:

output:

result:

ok Correct position at 991152

Test #40:

score: 0

Accepted

time: 1ms

memory: 3704kb

input:

output:

result:

ok Correct position at 14594

Test #41:

score: 0

Accepted

time: 1ms

memory: 3708kb

input:

output:

result:

ok Correct position at 514592

Test #42:

score: 0

Accepted

time: 0ms

memory: 3648kb

input:

1000000
0

output:

? 1000000
! 1000000

result:

ok Correct position at 1000000

Test #43:

score: 0

Accepted

time: 1ms

memory: 3720kb

input:

output:

result:

ok Correct position at 1