結果

問題 No.1024 Children in a Row
ユーザー 👑 hos.lyrichos.lyric
提出日時 2020-04-11 02:11:17
言語 D
(dmd 2.109.1)
結果
AC  
実行時間 443 ms / 2,000 ms
コード長 3,371 bytes
コンパイル時間 1,035 ms
コンパイル使用メモリ 126,108 KB
実行使用メモリ 51,712 KB
最終ジャッジ日時 2024-06-22 06:38:59
合計ジャッジ時間 13,100 ms
ジャッジサーバーID
(参考情報)
judge4 / judge1
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ファイルパターン 結果
sample AC * 3
other AC * 27
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; }
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)); }
void main() {
try {
for (; ; ) {
const N = readInt();
const M = readInt();
auto A = new int[M];
auto B = new int[M];
auto K = new int[M];
foreach (i; 0 .. M) {
A[i] = readInt() - 1;
B[i] = readInt() - 1;
K[i] = readInt() - 1;
}
auto heads = iota(N).array;
auto befs = new int[N + M];
befs[] = -1;
auto graph = new int[][N + M];
foreach (i; 0 .. M) {
befs[N + i] = heads[A[i]];
heads[A[i]] = N + i;
graph[heads[B[i]]] ~= N + i;
}
auto on = new bool[N + M];
foreach (j; 0 .. N) {
on[heads[j]] = true;
}
auto dis = new int[N + M];
auto fin = new int[N + M];
int[] us;
void dfs(int u) {
dis[u] = cast(int)(us.length);
if (on[u]) {
us ~= u;
}
foreach_reverse (v; graph[u]) {
dfs(v);
}
fin[u] = cast(int)(us.length);
}
foreach (j; 0 .. N) {
dfs(j);
}
debug {
writeln("us = ", us);
}
assert(us.length == N);
foreach (i; 0 .. M) {
const a = dis[N + i];
const b = fin[N + i];
const c = dis[befs[N + i]];
debug {
writefln("cut [%s, %s) and insert at %s", a, b, c);
}
alias Slice = Tuple!(int, "l", int, "r");
Slice[] slices;
if (c <= a) {
slices ~= Slice(0, c);
slices ~= Slice(a, b);
slices ~= Slice(c, a);
slices ~= Slice(b, N);
} else if (b <= c) {
slices ~= Slice(0, a);
slices ~= Slice(b, c);
slices ~= Slice(a, b);
slices ~= Slice(c, N);
} else {
assert(false);
}
int ans = -1;
int k = K[i];
foreach (ref slice; slices) {
const len = slice.r - slice.l;
if (k < len) {
const u = us[slice.l + k];
ans = (u < N) ? u : A[u - N];
break;
} else {
k -= len;
}
}
assert(ans != -1);
writeln(ans + 1);
}
}
} catch (EOFException e) {
}
}
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