結果

問題 No.2382 Amidakuji M
ユーザー 👑 hos.lyric
提出日時 2023-07-14 22:02:04
言語 D
(dmd 2.109.1)
結果
AC  
実行時間 45 ms / 2,000 ms
コード長 2,142 bytes
コンパイル時間 927 ms
コンパイル使用メモリ 116,608 KB
実行使用メモリ 10,552 KB
最終ジャッジ日時 2024-09-16 07:03:19
合計ジャッジ時間 2,107 ms
ジャッジサーバーID
(参考情報)
judge3 / judge2
このコードへのチャレンジ
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ファイルパターン 結果
sample AC * 3
other AC * 19
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

import std.conv, std.functional, std.range, std.stdio, std.string;
import std.algorithm, std.array, std.bigint, std.bitmanip, std.complex, std.container, std.math, std.mathspecial, std.numeric, std.regex, std.typecons
    ;
import core.bitop;
class EOFException : Throwable { this() { super("EOF"); } }
string[] tokens;
string readToken() { for (; tokens.empty; ) { if (stdin.eof) { throw new EOFException; } tokens = readln.split; } auto token = tokens.front; tokens
    .popFront; return token; }
int readInt() { return readToken.to!int; }
long readLong() { return readToken.to!long; }
bool chmin(T)(ref T t, in T f) { if (t > f) { t = f; return true; } else { return false; } }
bool chmax(T)(ref T t, in T f) { if (t < f) { t = f; return true; } else { return false; } }
int binarySearch(alias pred, T)(in T[] as) { int lo = -1, hi = cast(int)(as.length); for (; lo + 1 < hi; ) { const mid = (lo + hi) >> 1;
    (unaryFun!pred(as[mid]) ? hi : lo) = mid; } return hi; }
int lowerBound(T)(in T[] as, T val) { return as.binarySearch!(a => (a >= val)); }
int upperBound(T)(in T[] as, T val) { return as.binarySearch!(a => (a > val)); }
void bAdd(T)(T[] bit, int pos, T val)
in {
assert(0 <= pos && pos < bit.length, "bAdd: 0 <= pos < |bit| must hold");
}
do {
for (int x = pos; x < bit.length; x |= x + 1) {
bit[x] += val;
}
}
// sum of [0, pos)
T bSum(T)(T[] bit, int pos)
in {
assert(0 <= pos && pos <= bit.length, "bSum: 0 <= pos <= |bit| must hold");
}
do {
T ret = 0;
for (int x = pos - 1; x >= 0; x = (x & (x + 1)) - 1) {
ret += bit[x];
}
return ret;
}
void main() {
try {
for (; ; ) {
const N = readInt;
const M = readLong;
auto P = new int[N];
foreach (i; 0 .. N) {
P[i] = readInt - 1;
}
auto bit = new int[N];
long f;
foreach (i; 0 .. N) {
f += (i - bit.bSum(P[i]));
bit.bAdd(P[i], +1);
}
debug {
writeln("f = ", f);
}
long ans = (f + M - 1) / M * M;
if ((ans - f) % 2 != 0) ans += M;
if ((ans - f) % 2 != 0) ans = -1;
writeln(ans);
}
} catch (EOFException e) {
}
}
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