結果
| 問題 |
No.686 Uncertain LIS
|
| コンテスト | |
| ユーザー |
|
| 提出日時 | 2020-03-31 09:50:08 |
| 言語 | D (dmd 2.109.1) |
| 結果 |
AC
|
| 実行時間 | 237 ms / 2,000 ms |
| コード長 | 3,975 bytes |
| コンパイル時間 | 1,572 ms |
| コンパイル使用メモリ | 158,572 KB |
| 実行使用メモリ | 9,408 KB |
| 最終ジャッジ日時 | 2024-06-22 06:18:21 |
| 合計ジャッジ時間 | 6,897 ms |
|
ジャッジサーバーID (参考情報) |
judge1 / judge2 |
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| ファイルパターン | 結果 |
|---|---|
| other | AC * 36 |
ソースコード
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; }
real readReal() { return readToken.to!real; }
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)); }
uint xrand() {
static uint x = 314159265, y = 358979323, z = 846264338, w = 327950288;
uint t = x ^ x << 11; x = y; y = z; z = w; return w = w ^ w >> 19 ^ t ^ t >> 8;
}
class Tree {
Tree l, r;
int size;
int val, ad;
this(int val) {
l = r = null;
size = 1;
this.val = val;
this.ad = 0;
}
void propagate() {
if (l) l.ad += ad;
if (r) r.ad += ad;
val += ad;
ad = 0;
}
Tree change(Tree l, Tree r) {
this.l = l;
this.r = r;
size = (l ? l.size : 0) + 1 + (r ? r.size : 0);
return this;
}
}
Tree merge(Tree a, Tree b) {
if (!a) return b;
if (!b) return a;
a.propagate();
b.propagate();
if (xrand() % (a.size + b.size) < a.size) {
return a.change(a.l, merge(a.r, b));
} else {
return b.change(merge(a, b.l), b.r);
}
}
Tuple!(Tree, Tree) splitGE(Tree a, int key) {
if (!a) return tuple!(Tree, Tree)(null, null);
a.propagate();
if (key <= a.val) {
auto l = splitGE(a.l, key);
return tuple(l[0], a.change(l[1], a.r));
} else {
auto r = splitGE(a.r, key);
return tuple(a.change(a.l, r[0]), r[1]);
}
}
Tuple!(Tree, Tree) splitHead(Tree a) {
assert(a);
a.propagate();
if (a.l) {
auto l = splitHead(a.l);
return tuple(l[0], a.change(l[1], a.r));
} else {
return tuple(a, a.r);
}
}
string toStr(Tree a) {
if (!a) return "";
return format("<%s (%s+%s) %s>", toStr(a.l), a.val, a.ad, toStr(a.r));
}
int[] toSeq(Tree a, int ad = 0) {
if (!a) return [];
ad += a.ad;
return toSeq(a.l, ad) ~ (a.val + ad) ~ toSeq(a.r, ad);
}
void main() {
try {
for (; ; ) {
const N = readInt();
auto L = new int[N];
auto R = new int[N];
foreach (i; 0 .. N) {
L[i] = readInt();
R[i] = readInt();
}
debug {
// O~(\sum_i (R[i] - L[i] + 1))
int[] lis;
foreach (i; 0 .. N) {
foreach_reverse (x; L[i] .. R[i] + 1) {
const pos = lis.lowerBound(x);
if (pos == lis.length) {
lis ~= x;
} else {
lis[pos] = x;
}
}
writeln(L[i], " ", R[i], " ", lis);
}
writeln("brute: ", lis.length);
}
Tree t = null;
foreach (i; 0 .. N) {
auto sp0 = t.splitGE(L[i]);
auto sp1 = sp0[1].splitGE(R[i]);
if (sp1[1]) {
sp1[1] = sp1[1].splitHead[1];
}
if (sp1[0]) {
sp1[0].ad += 1;
}
debug {
writeln(" ", sp0[0].toSeq, " ", sp1[0].toSeq, " ", sp1[1].toSeq);
}
t = sp0[0].merge(new Tree(L[i])).merge(sp1[0]).merge(sp1[1]);
debug {
writeln(L[i], " ", R[i], " ", t.toSeq, " ", t.toStr);
}
}
writeln(t.size);
}
} catch (EOFException e) {
}
}