QOJ.ac

QOJ

IDProblemSubmitterResultTimeMemoryLanguageFile sizeSubmit timeJudge time
#409061#8287. Caught in the Middleucup-team3215#WA 1ms3968kbC++201.4kb2024-05-11 16:59:472024-05-11 16:59:48

Judging History

你现在查看的是最新测评结果

  • [2024-05-11 16:59:48]
  • 评测
  • 测评结果:WA
  • 用时:1ms
  • 内存:3968kb
  • [2024-05-11 16:59:47]
  • 提交

answer

#include <bits/stdc++.h>

using namespace std;

#define all(x) (x).begin(), (x).end()
using pii = array<int, 2>;
using vi = vector<int>;

const int N = 12;
using bs = bitset<N>;
vector<vi> dp(N + 1, vi(1 << N, -1));

int sol(int m, int n) {
    if (dp[n][m] != -1) {
        return dp[n][m];
    }
    pii cnt = {};
    for (int i = 0; i < n; ++i) {
        if (m & (1 << i)) {
            // cout << bs(m) << ' ' << bs(m >> (i + 1)) << endl;
            int ret = sol(m >> (i + 1), n - 1 - i);
            ++cnt[ret];
        } else {
            // cout << bs(m) << ' ' << bs(m & ((1 << (i + 1)) - 1)) << endl;
            int ret = sol(m & ((1 << (i + 1)) - 1), i);
            ++cnt[ret];
        }
    }

    return dp[n][m] = (cnt[0] > 0);
}

int main() {
    dp[0][0] = 0;
    for (int i = 1; i < (1 << N); ++i) {
        if (sol(i, N) == 0) {
            // cout << bs(i) << endl;
            bool cond = (i & (1 << (N - 1))) == 0 && (i & 1) && bs(i).count() * 2 == N;
            assert(cond);
        }
    }

    ios::sync_with_stdio(false);
    cin.tie(0);
    int t;
    cin >> t;
    while (t--) {
        int n;
        cin >> n;
        string s;
        cin >> s;
        pii cnt = {};
        for (char c : s) {
            ++cnt[c == 'L' ? 0 : 1];
        }
        bool cond = s[n - 1] == 'L' && s[0] == 'R' && cnt[0] * 2 == n;
        cout << (cond ? "Bob" : "Alice") << '\n';
    }
}

Details

Tip: Click on the bar to expand more detailed information

Test #1:

score: 100
Accepted
time: 0ms
memory: 3688kb

input:

20
10
RLRRRRLLRR
10
LRLLLLRRLR
6
RLRLRL
10
LLRLRRRRLR
6
LRRLLL
3
RLR
5
LLRRR
6
RRRRRL
9
LRRRLRRLR
1
R
10
RRRLLRRLLL
6
LRLLLR
9
LLRLRLRLR
7
RRRRLRR
2
LL
10
RRRLLRRLRR
2
RL
7
RRLRRLR
3
LLR
10
LLRLRRRLLR

output:

Alice
Alice
Bob
Alice
Alice
Alice
Alice
Alice
Alice
Alice
Bob
Alice
Alice
Alice
Alice
Alice
Bob
Alice
Alice
Alice

result:

ok 20 lines

Test #2:

score: 0
Accepted
time: 1ms
memory: 3788kb

input:

20
7
LRLLRRR
8
LRLRLRRR
3
RLL
10
RLRLRLRLRL
10
RLRLRLRLRL
6
RLLLRL
10
RLRLRLRLLL
5
RLRRR
2
LL
10
RRRRLRLRLL
7
LLRRLLR
3
LRR
10
RRRRRLLLLL
10
RLRRRLRLRR
2
LR
6
RRLLLL
4
RRLR
10
LRLRLLRLRR
4
LRLL
10
RRLLRRRLLL

output:

Alice
Alice
Alice
Bob
Bob
Alice
Alice
Alice
Alice
Alice
Alice
Alice
Bob
Alice
Alice
Alice
Alice
Alice
Alice
Bob

result:

ok 20 lines

Test #3:

score: 0
Accepted
time: 1ms
memory: 3964kb

input:

20
8
LLLRRRRR
10
LRRRLRLLRL
10
RLRLRLRLRL
6
RRLRRL
10
RLLLLRLLRR
2
RR
8
LLRRRLRL
10
LRLRLRRRRR
4
RRLL
5
LLRLL
10
RLRRLLRLRL
1
R
10
RLLRRLRLLL
10
LLLRLLRLRR
10
LRRLRLLRRR
3
RRL
10
RRRLRLLRLL
1
L
3
RRL
5
LRRLL

output:

Alice
Alice
Bob
Alice
Alice
Alice
Alice
Alice
Bob
Alice
Bob
Alice
Alice
Alice
Alice
Alice
Bob
Alice
Alice
Alice

result:

ok 20 lines

Test #4:

score: 0
Accepted
time: 1ms
memory: 3944kb

input:

20
6
RLRLLL
2
RL
10
LRRRLRLRLR
7
LLLRRRR
3
RRR
3
LRL
10
LRLRRLLLLR
10
RRLLLLRLLR
5
LLLLL
10
RLRLLRLRLR
8
RRLRLRLL
9
RRLRLRRLR
8
RLRLRLRL
1
R
10
RRLRLRRRLL
3
LLL
1
L
6
LLLRLL
10
RLRLRLRRLL
3
LRL

output:

Alice
Bob
Alice
Alice
Alice
Alice
Alice
Alice
Alice
Alice
Bob
Alice
Bob
Alice
Alice
Alice
Alice
Alice
Bob
Alice

result:

ok 20 lines

Test #5:

score: 0
Accepted
time: 1ms
memory: 3792kb

input:

20
4
RLRL
10
RRRLLRLLRL
10
RLRRLRLRLL
4
RLRL
4
RLRL
2
LR
2
RL
1
R
6
RRLRLL
10
RRRLRRLLLL
1
L
10
RLLRRRLLLL
2
RL
8
RRRRLLLL
10
RRLRRRLLLL
10
RLRRLRLRLL
10
RRLLRRLRLL
1
L
4
RLRL
4
RLRL

output:

Bob
Bob
Bob
Bob
Bob
Alice
Bob
Alice
Bob
Bob
Alice
Alice
Bob
Bob
Bob
Bob
Bob
Alice
Bob
Bob

result:

ok 20 lines

Test #6:

score: 0
Accepted
time: 1ms
memory: 3888kb

input:

20
10
RRLLRLRRLL
4
RLRL
10
RRLLRLRLRL
1
L
2
LR
3
LLR
10
RLRRLRRLLL
10
RRLLRRLLRL
3
RRL
10
RRLRLLRRLL
1
L
10
RRRLLRLLRL
8
RLRLRRLL
10
RRLRLRLRLL
8
RRLLRRLL
3
RLL
4
RLRL
2
LR
10
RRRLLLRLRL
10
RRLRRRLLLL

output:

Bob
Bob
Bob
Alice
Alice
Alice
Bob
Bob
Alice
Bob
Alice
Bob
Bob
Bob
Bob
Alice
Bob
Alice
Bob
Bob

result:

ok 20 lines

Test #7:

score: 0
Accepted
time: 1ms
memory: 3776kb

input:

20
1
L
4
RRLL
10
RLRRRRLLLL
10
RRLLRRRLLL
4
RLRL
3
LRR
3
RRR
1
R
4
RRLL
10
RLRLRLRLRL
10
RRRLLRRLLL
8
RRRLLRLL
10
RLRLRRLRLL
8
RRLLRLRL
4
RRLL
10
RRLLRRRLLL
1
L
8
RLRRLRLL
8
RRLLRRLL
6
RLRRLL

output:

Alice
Bob
Bob
Bob
Bob
Alice
Alice
Alice
Bob
Bob
Bob
Bob
Bob
Bob
Bob
Bob
Alice
Bob
Bob
Bob

result:

ok 20 lines

Test #8:

score: 0
Accepted
time: 1ms
memory: 3968kb

input:

20
8
RRRLLLRL
4
RLRL
4
RLRL
10
RRRLLRLRLL
10
RLRLRLRLRL
4
RRLL
8
RRRRLLLL
6
RRLRLL
8
RRRLRLLL
10
RRRRLRLLLL
6
RLRRLL
6
RRLRLL
10
RRRLRRLLLL
8
RLRRLLRL
6
RRRLLL
4
RLRL
4
RLRL
6
RRLLRL
4
RLRL
1
L

output:

Bob
Bob
Bob
Bob
Bob
Bob
Bob
Bob
Bob
Bob
Bob
Bob
Bob
Bob
Bob
Bob
Bob
Bob
Bob
Alice

result:

ok 20 lines

Test #9:

score: 0
Accepted
time: 1ms
memory: 3692kb

input:

20
10
RRRRRLLLLL
1
L
8
RRRRLLLL
3
LRR
4
RLLL
10
RRLRRLLRLL
10
RRRRLLLRLL
1
R
2
LL
6
RRRLLL
3
RRR
10
RRRRRLLLLL
1
R
10
RRRLRRLLLL
8
RRRRLLLL
4
RRLL
10
RRRRRLLLLL
4
RRLL
8
RRRRLLLL
10
RRRRRLLLLL

output:

Bob
Alice
Bob
Alice
Alice
Bob
Bob
Alice
Alice
Bob
Alice
Bob
Alice
Bob
Bob
Bob
Bob
Bob
Bob
Bob

result:

ok 20 lines

Test #10:

score: 0
Accepted
time: 1ms
memory: 3724kb

input:

20
6
RLRLRL
2
RL
10
RLRLRLRLRL
10
RLRLRLRLRL
4
RLRL
8
RLRLRLRL
1
L
8
RLLRLLRR
6
RRLRLL
8
RLRRLLRL
10
RLRLRRLLRL
10
RLRLRLRLRL
10
RLRLRLRRLL
6
RLRLRL
8
RLRLRRLL
6
RLRLRL
6
RLRLRL
8
RLRLRLRL
10
RRRLRLLRLL
2
RL

output:

Bob
Bob
Bob
Bob
Bob
Bob
Alice
Alice
Bob
Bob
Bob
Bob
Bob
Bob
Bob
Bob
Bob
Bob
Bob
Bob

result:

ok 20 lines

Test #11:

score: 0
Accepted
time: 1ms
memory: 3792kb

input:

20
3
LRR
1
R
8
RRLLRLRL
10
LLLRRRLRLR
4
RLRL
1
L
10
RRLLRLRLRL
4
RLRL
3
LLL
10
RRLRLRLRLL
6
RRLLRL
2
LL
4
RLRL
10
RLRLRLRLRL
8
RLRLRLRL
6
RLRLRL
10
RLRRLLRLRL
10
RRRRLLRLLL
10
RLRLRLRLRL
8
RLRLRLRL

output:

Alice
Alice
Bob
Alice
Bob
Alice
Bob
Bob
Alice
Bob
Bob
Alice
Bob
Bob
Bob
Bob
Bob
Bob
Bob
Bob

result:

ok 20 lines

Test #12:

score: -100
Wrong Answer
time: 0ms
memory: 3728kb

input:

1
478
RLRLRLRRLRLLRRLLRLRRLLRRRLLLRLRLRRLLRRRRLLLLRRRLLRLLRRLRLLRRLLRLRLRRLLRLRRLRLLRLRLRRLLRLRLRRLLRLRRRRLLLLRLRLRRLLRLRRRLLLRRRRLLLLRLRLRLRLRRRLLLRLRLRLRRRRLLLLRRLRLRLLRLRLLRRRRRLLLLRLRLRLRLRRLLRRRRLLLLRRLLRLRLRLRLRLRLRLRLRLRLRRLLRLRLRRRLLLRLRRRLLRLLRLRLRRLRLLRRRLRLLLRLRRLLRLRLRRLRLLRLRLRLRLRLRLRL...

output:

Bob

result:

wrong answer 1st lines differ - expected: 'Alice', found: 'Bob'