結果

問題 No.1087 転倒数の転倒数
ユーザー risujiroh
提出日時 2020-06-19 23:28:15
言語 C++17
(gcc 13.3.0 + boost 1.87.0)
結果
AC  
実行時間 155 ms / 2,000 ms
コード長 2,889 bytes
コンパイル時間 2,559 ms
コンパイル使用メモリ 203,760 KB
最終ジャッジ日時 2025-01-11 08:06:12
ジャッジサーバーID
(参考情報)
judge4 / judge2
このコードへのチャレンジ
(要ログイン)
ファイルパターン 結果
sample AC * 6
other AC * 31
権限があれば一括ダウンロードができます

ソースコード

diff #
プレゼンテーションモードにする

#include <bits/stdc++.h>
using namespace std;
#ifdef LOCAL
#include "debug.h"
#else
#define DEBUG(...)
#endif
template <class T> struct fenwick {
int n;
vector<T> t;
fenwick(int _n = -1) : n(_n), t(n + 1) {}
void add(int i, T a) { for (++i; i <= n; i += i & -i) t[i] += a; }
T sum(int i) const {
T s = 0;
for (; i; i -= i & -i) s += t[i];
return s;
}
T sum(int l, int r) const { return sum(r) - sum(l); }
int kth(T k) const {
int i = 0;
for (int w = 1 << __lg(n); w; w >>= 1)
if (i + w <= n and t[i + w] <= k) k -= t[i += w];
return i;
}
};
int main() {
cin.tie(nullptr);
ios::sync_with_stdio(false);
auto f = [](int n, int x) {
vector<int> ord(n), a(n);
for (int i = 0; i < n; ++i) {
int t = min(x, i);
ord[i] = i - t;
x -= t;
}
fenwick<int> ft(n);
for (int i = 0; i < n; ++i) {
ft.add(i, 1);
}
for (int i = n; i--; ) {
a[i] = ft.kth(ord[i]);
ft.add(a[i], -1);
}
return a;
};
int n, k;
cin >> n >> k;
if (k > n * (n - 1)) {
cout << "No\n";
exit(0);
}
cout << "Yes\n";
if (k <= n * (n - 1) / 2) {
auto row = f(n, k);
for (int i = 0; i < n; ++i) {
auto a = f(n, row[i]);
for (int j = 0; j < n; ++j) {
cout << i * n + a[j] << " \n"[j == n - 1];
}
}
exit(0);
}
if (n < 4) {
vector<int> p(n * n);
iota(begin(p), end(p), 0);
do {
vector a(n, vector<int>(n));
vector<int> row(n), col(n);
for (int i = 0; i < n; ++i) {
for (int j = 0; j < n; ++j) {
a[i][j] = p[i * n + j];
}
for (int y = 0; y < n; ++y) {
for (int x = 0; x < y; ++x) {
row[i] += a[i][x] > a[i][y];
}
}
}
for (int j = 0; j < n; ++j) {
for (int y = 0; y < n; ++y) {
for (int x = 0; x < y; ++x) {
col[j] += a[x][j] > a[y][j];
}
}
}
int t = 0;
for (int y = 0; y < n; ++y) {
for (int x = 0; x < y; ++x) {
t += row[x] > row[y];
t += col[x] > col[y];
}
}
if (t == k) {
for (int i = 0; i < n; ++i) {
for (int j = 0; j < n; ++j) {
cout << a[i][j] << " \n"[j == n - 1];
}
}
break;
}
} while (next_permutation(begin(p), end(p)));
exit(0);
}
k -= n * (n - 1) / 2;
auto row = f(n, k);
for (int i = 0; i < n; ++i) {
row[i] -= n - i - 1;
}
int mn = *min_element(begin(row), end(row));
for (auto&& e : row) {
e -= mn;
}
for (int i = 0; i < n; ++i) {
auto a = f(n - 1, row[i]);
for (int j = 0; j < n; ++j) {
int cur = 0;
if (j < n - i - 1) {
cur = i * n + a[j] + 1;
} else if (j > n - i - 1) {
cur = i * n + a[j - 1] + 1;
}
cout << cur << " \n"[j == n - 1];
}
}
}
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