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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
#104399	#6394. Turn on the Light	maomao90	AC ✓	5ms	3480kb	C++17	1.6kb	2023-05-10 16:54:13	2023-05-10 16:54:16

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.

[2023-05-10 16:54:16]
评测

测评结果：AC
用时：5ms
内存：3480kb

查看

[2023-05-10 16:54:13]
提交

answer


// Hallelujah, praise the one who set me free
// Hallelujah, death has lost its grip on me
// You have broken every chain, There's salvation in your name
// Jesus Christ, my living hope
#include <bits/stdc++.h> 
using namespace std;

#define REP(i, s, e) for (int i = (s); i < (e); i++)
#define RREP(i, s, e) for (int i = (s); i >= (e); i--)
template <class T>
inline bool mnto(T& a, T b) {return a > b ? a = b, 1 : 0;}
template <class T>
inline bool mxto(T& a, T b) {return a < b ? a = b, 1: 0;}
typedef long long ll;
typedef long double ld;
#define FI first
#define SE second
typedef pair<int, int> ii;
typedef pair<ll, ll> pll;
typedef tuple<int, int, int> iii;
#define ALL(_a) _a.begin(), _a.end()
#define SZ(_a) (int) _a.size()
#define pb push_back
typedef vector<int> vi;
typedef vector<ll> vll;
typedef vector<ii> vii;
typedef vector<iii> viii;

#ifndef DEBUG
#define cerr if (0) cerr
#endif

const int INF = 1000000005;
const ll LINF = 1000000000000000005ll;
const int MAXN = 200005;

int n;

int ask(int x) {
    cout << "? " << x << endl;
    int res; cin >> res;
    return res;
}
void answer(int x) {
    cout << "! " << x << '\n';
}

int main() {
    cin >> n;
    REP (i, 1, min(20, n) + 1) {
        if (ask(i) != i) {
            answer(i);
            return 0;
        }
    }
    int prv = 20;
    int lo = 21, hi = n, mid;
    while (1) {
        mid = lo + hi >> 1;
        int nxt = ask(mid);
        if (nxt == prv) {
            answer(mid);
            return 0;
        }
        if (nxt == prv + 1) {
            lo = mid + 1;
        } else {
            assert(nxt == prv - 1);
            hi = mid - 1;
        }
        prv = nxt;
    }
    return 0;
}

源文件, 语言: C++17

詳細信息

Test #1:

score: 100

Accepted

time: 3ms

memory: 3284kb

input:

output:

? 1
? 2
? 3
! 3

result:

ok Correct position at 3

Test #2:

score: 0

Accepted

time: 2ms

memory: 3268kb

input:

output:

? 1
? 2
? 3
? 4
? 5
? 6
? 7
? 8
? 9
! 9

result:

ok Correct position at 9

Test #3:

score: 0

Accepted

time: 3ms

memory: 3416kb

input:

output:

? 1
? 2
? 3
? 4
? 5
? 6
? 7
? 8
! 8

result:

ok Correct position at 8

Test #4:

score: 0

Accepted

time: 3ms

memory: 3280kb

input:

output:

? 1
? 2
? 3
? 4
? 5
? 6
? 7
! 7

result:

ok Correct position at 7

Test #5:

score: 0

Accepted

time: 3ms

memory: 3408kb

input:

output:

? 1
? 2
? 3
? 4
? 5
? 6
! 6

result:

ok Correct position at 6

Test #6:

score: 0

Accepted

time: 0ms

memory: 3408kb

input:

output:

? 1
? 2
? 3
? 4
? 5
? 6
! 6

result:

ok Correct position at 6

Test #7:

score: 0

Accepted

time: 2ms

memory: 3292kb

input:

output:

? 1
? 2
? 3
? 4
! 4

result:

ok Correct position at 4

Test #8:

score: 0

Accepted

time: 2ms

memory: 3440kb

input:

output:

? 1
? 2
? 3
? 4
! 4

result:

ok Correct position at 4

Test #9:

score: 0

Accepted

time: 2ms

memory: 3284kb

input:

3
1
1

output:

? 1
? 2
! 2

result:

ok Correct position at 2

Test #10:

score: 0

Accepted

time: 2ms

memory: 3268kb

input:

2
1
1

output:

? 1
? 2
! 2

result:

ok Correct position at 2

Test #11:

score: 0

Accepted

time: 2ms

memory: 3412kb

input:

1
0

output:

? 1
! 1

result:

ok Correct position at 1

Test #12:

score: 0

Accepted

time: 4ms

memory: 3480kb

input:

output:

result:

ok Correct position at 937462

Test #13:

score: 0

Accepted

time: 5ms

memory: 3308kb

input:

output:

result:

ok Correct position at 187476

Test #14:

score: 0

Accepted

time: 0ms

memory: 3400kb

input:

output:

result:

ok Correct position at 687465

Test #15:

score: 0

Accepted

time: 5ms

memory: 3396kb

input:

output:

result:

ok Correct position at 437470

Test #16:

score: 0

Accepted

time: 2ms

memory: 3280kb

input:

output:

result:

ok Correct position at 937458

Test #17:

score: 0

Accepted

time: 2ms

memory: 3388kb

input:

output:

result:

ok Correct position at 249974

Test #18:

score: 0

Accepted

time: 4ms

memory: 3408kb

input:

output:

result:

ok Correct position at 749961

Test #19:

score: 0

Accepted

time: 0ms

memory: 3296kb

input:

output:

result:

ok Correct position at 499967

Test #20:

score: 0

Accepted

time: 4ms

memory: 3276kb

input:

output:

result:

ok Correct position at 999953

Test #21:

score: 0

Accepted

time: 1ms

memory: 3324kb

input:

output:

result:

ok Correct position at 249973

Test #22:

score: 0

Accepted

time: 1ms

memory: 3460kb

input:

output:

result:

ok Correct position at 43

Test #23:

score: 0

Accepted

time: 4ms

memory: 3412kb

input:

output:

result:

ok Correct position at 51

Test #24:

score: 0

Accepted

time: 5ms

memory: 3480kb

input:

output:

result:

ok Correct position at 51

Test #25:

score: 0

Accepted

time: 0ms

memory: 3344kb

input:

output:

result:

ok Correct position at 51

Test #26:

score: 0

Accepted

time: 2ms

memory: 3392kb

input:

output:

result:

ok Correct position at 999781

Test #27:

score: 0

Accepted

time: 2ms

memory: 3464kb

input:

output:

result:

ok Correct position at 999980

Test #28:

score: 0

Accepted

time: 4ms

memory: 3292kb

input:

output:

result:

ok Correct position at 999979

Test #29:

score: 0

Accepted

time: 4ms

memory: 3480kb

input:

output:

result:

ok Correct position at 999978

Test #30:

score: 0

Accepted

time: 5ms

memory: 3308kb

input:

output:

result:

ok Correct position at 499947

Test #31:

score: 0

Accepted

time: 2ms

memory: 3344kb

input:

output:

result:

ok Correct position at 500070

Test #32:

score: 0

Accepted

time: 2ms

memory: 3292kb

input:

output:

result:

ok Correct position at 500076

Test #33:

score: 0

Accepted

time: 3ms

memory: 3268kb

input:

output:

result:

ok Correct position at 499965

Test #34:

score: 0

Accepted

time: 0ms

memory: 3352kb

input:

output:

result:

ok Correct position at 795856

Test #35:

score: 0

Accepted

time: 2ms

memory: 3344kb

input:

output:

result:

ok Correct position at 170868

Test #36:

score: 0

Accepted

time: 5ms

memory: 3348kb

input:

output:

result:

ok Correct position at 670857

Test #37:

score: 0

Accepted

time: 5ms

memory: 3464kb

input:

output:

result:

ok Correct position at 420862

Test #38:

score: 0

Accepted

time: 1ms

memory: 3324kb

input:

output:

result:

ok Correct position at 1000000

Test #39:

score: 0

Accepted

time: 4ms

memory: 3312kb

input:

output:

result:

ok Correct position at 999999

Test #40:

score: 0

Accepted

time: 5ms

memory: 3284kb

input:

output:

result:

ok Correct position at 999998

Test #41:

score: 0

Accepted

time: 2ms

memory: 3416kb

input:

output:

result:

ok Correct position at 999997

Test #42:

score: 0

Accepted

time: 3ms

memory: 3400kb

input:

output:

result:

ok Correct position at 1000000

Test #43:

score: 0

Accepted

time: 1ms

memory: 3296kb

input:

1000000
0

output:

? 1
! 1

result:

ok Correct position at 1