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ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#468273 | #8529. Balance of Permutation | ucup-team3519# | WA | 3250ms | 16764kb | C++20 | 3.3kb | 2024-07-08 20:04:39 | 2024-07-08 20:04:40 |
Judging History
answer
#include <bits/stdc++.h>
using i128 = __int128_t;
template <typename Tp>
void read(Tp &res) {
char ch;
ch = std::cin.get();
while (!isdigit(ch)) {
ch = std::cin.get();
}
res = 0;
while (isdigit(ch)) {
res = res * 10 + int(ch - 48);
ch = std::cin.get();
}
}
constexpr int N = 30;
i128 dp[2][N * N / 2 + 19][N][N];
int main() {
std::ios::sync_with_stdio(false);
std::cin.tie(nullptr);
int n, b;
i128 k;
read(n), read(b), read(k);
std::vector<uint8_t> upper(n), lower(n);
std::vector<int> ans;
auto check = [&]() -> i128 {
memset(dp[1], 0, sizeof(dp[1]));
dp[1][0][0][0] = 1;
for (int i = 0; i < n; ++i) {
memset(dp[i & 1], 0, sizeof(dp[i & 1]));
for (int j = 0; j <= i * i / 2; ++j) {
for (int a = 0; a <= i; ++a) {
for (int b = 0; b <= i; ++b) {
if (dp[i & 1 ^ 1][j][a][b] == 0) {
continue;
}
i128 val = dp[i & 1 ^ 1][j][a][b];
if (!upper[i] && !lower[i]) {
// null
dp[i & 1][j + a + b][a][b] += val;
// a -= 1 a += 1
dp[i & 1][j + a + b][a][b] += a * val;
// b -= 1 b += 1
dp[i & 1][j + a + b][a][b] += b * val;
// a -= 1 b -= 1
if (a && b) {
dp[i & 1][j + a + b][a - 1][b - 1] += a * b * val;
}
// a += 1 b += 1
dp[i & 1][j + a + b][a + 1][b + 1] += val;
} else if (!lower[i]) {
dp[i & 1][j + a + b][a + 1][b] += val;
if (b) {
dp[i & 1][j + a + b][a][b - 1] += b * val;
}
} else if (!upper[i]) {
dp[i & 1][j + a + b][a][b + 1] += val;
if (a) {
dp[i & 1][j + a + b][a - 1][b] += a * val;
}
} else {
dp[i & 1][j + a + b][a][b] += val;
}
}
}
}
}
return dp[(n - 1) & 1][b][0][0];
};
for (int i = 0; i < n; ++i) {
upper[i] = true;
for (int j = 0; j < n; ++j) {
if (!lower[j]) {
int tmp_b = b;
b -= abs(i - j);
if (b < 0) {
continue;
}
lower[j] = true;
i128 num = check();
if (k <= num) {
ans.push_back(j + 1);
break;
}
b = tmp_b;
k -= num;
lower[j] = false;
}
}
}
for (int i : ans) {
std::cout << i << ' ';
}
}
Details
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Test #1:
score: 100
Accepted
time: 18ms
memory: 16764kb
input:
6 6 6
output:
1 2 6 3 4 5
result:
ok 6 numbers
Test #2:
score: -100
Wrong Answer
time: 3250ms
memory: 16716kb
input:
30 300 3030303030303030303030
output:
1 2 3 4 9 23 21 12 24 29 26 30 27 22 20 17 10 25 28 15 19 13 7 14 6 8 5 18 16 11
result:
wrong answer 7th numbers differ - expected: '20', found: '21'