結果

問題 No.1865 Make Cycle
ユーザー daut-dlangdaut-dlang
提出日時 2022-03-04 22:58:37
言語 D
(dmd 2.106.1)
結果
AC  
実行時間 553 ms / 3,000 ms
コード長 3,088 bytes
コンパイル時間 843 ms
コンパイル使用メモリ 106,232 KB
実行使用メモリ 26,948 KB
最終ジャッジ日時 2023-09-04 16:18:01
合計ジャッジ時間 9,247 ms
ジャッジサーバーID
(参考情報)
judge13 / judge11
このコードへのチャレンジ
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テストケース

テストケース表示
入力 結果 実行時間
実行使用メモリ
testcase_00 AC 363 ms
25,576 KB
testcase_01 AC 210 ms
23,208 KB
testcase_02 AC 432 ms
25,572 KB
testcase_03 AC 126 ms
14,472 KB
testcase_04 AC 249 ms
20,980 KB
testcase_05 AC 347 ms
22,764 KB
testcase_06 AC 355 ms
24,504 KB
testcase_07 AC 317 ms
24,408 KB
testcase_08 AC 456 ms
25,352 KB
testcase_09 AC 344 ms
18,124 KB
testcase_10 AC 381 ms
22,600 KB
testcase_11 AC 357 ms
19,572 KB
testcase_12 AC 300 ms
11,552 KB
testcase_13 AC 343 ms
25,192 KB
testcase_14 AC 233 ms
22,648 KB
testcase_15 AC 420 ms
24,316 KB
testcase_16 AC 443 ms
25,888 KB
testcase_17 AC 325 ms
26,948 KB
testcase_18 AC 341 ms
18,148 KB
testcase_19 AC 553 ms
20,120 KB
testcase_20 AC 1 ms
4,376 KB
testcase_21 AC 2 ms
4,376 KB
testcase_22 AC 2 ms
4,376 KB
testcase_23 AC 2 ms
4,380 KB
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ソースコード

diff #

import std.stdio, std.conv, std.functional, std.string;
import std.algorithm, std.array, std.container, std.range, std.typecons;
import std.bigint, std.numeric, std.math, std.random;
import core.bitop;

string FMT_F = "%.10f";

static File _f;
void file_io(string fn) { _f = File(fn, "r"); }
static string[] s_rd;
T _RD(T = long)() { while(!s_rd.length) s_rd = readln.chomp.split; string res = s_rd[0]; s_rd.popFront; return res.to!T; }
T _RD(T = long)(File f) { while(!s_rd.length) s_rd = f.readln.chomp.split; string res = s_rd[0]; s_rd.popFront; return res.to!T; }
T[] _RDA(T = long)(T fix = 0) { auto r = readln.chomp.split.to!(T[]); r[] += fix; return r; }
T[] _RDA(T = long)(File f, T fix = 0) { auto r = f.readln.chomp.split.to!(T[]); r[] += fix; return r; }
T RD(T = long)() { if (_f.isOpen) return _RD!T(_f); else return _RD!T; }
T[] RDA(T = long)(T fix = 0) { if (_f.isOpen)  return _RDA!T(_f, fix); else return _RDA!T(fix); }

size_t[] MAKE_IDX(alias less = "a < b", Range)(Range range) { auto idx = new size_t[](range.length); makeIndex!(less)(range, idx); return idx;}
size_t MIN_POS(alias less = "a < b", Range)(Range range) { auto r = minPos!(less)(range); return range.length - r.length; }

void chmin(T)(ref T x, T y) { x = min(x, y); } void chmax(T)(ref T x, T y) { x = max(x, y); }
bool inside(T)(T x, T b, T e) { return x >= b && x < e; }
T lcm(T)(T x, T y) { return x * (y / gcd(x, y)); }
double euDist(T)(T[] a, T[] b) { auto c = a.dup; c[] -= b[]; c[] *= c[]; return sqrt(cast(double)c.sum); }
double[] rotate(double[] vec, double rad) { return [cos(rad)*vec[0] - sin(rad)*vec[1], sin(rad)*vec[0] + cos(rad)*vec[1]]; }
double norm(double[] vec) { return sqrt(reduce!((a,b)=>a+b*b)(0.0, vec)); }
double dotProd(double[] a, double[] b) { auto r = a.dup; r[] *= b[]; return r.sum; }

long mod = 10^^9 + 7;
//long mod = 998_244_353;
//long mod = 1_000_003;
void moda(ref long x, long y) { x = (x + y) % mod; }
void mods(ref long x, long y) { x = ((x + mod) - (y % mod)) % mod; }
void modm(ref long x, long y) { x = (x * y) % mod; }
void modpow(ref long x, long y) { if (!y) { x = 1; return; } auto t = x; x.modpow(y>>1); x.modm(x); if (y&1) x.modm(t); }
void modd(ref long x, long y) { y.modpow(mod - 2); x.modm(y); }

T binarySearch(alias pred, T)(T ok, T ng)
{ 
	while (abs(ok-ng) > 1)
	{
		auto mid = (ok+ng)/2;
		if (unaryFun!pred(mid)) ok = mid;
		else ng = mid;
	}
	return ok;
}

void main()
{
	auto N = RD;
	auto Q = RD;
	auto A = new long[](Q);
	auto B = new long[](Q);
	foreach (i; 0..Q)
	{
		A[i] = RD-1;
		B[i] = RD-1;
	}

	bool f(long x)
	{
		auto edges = new long[][](N);
		auto cnt = new long[](N);
		foreach (i; 0..x)
		{
			edges[A[i]] ~= B[i];
			++cnt[B[i]];
		}

		long[] q;
		foreach (i; 0..N)
		{
			if (cnt[i] == 0)
				q ~= i;
		}

		long len;
		while (!q.empty)
		{
			auto u = q.front; q.popFront;
			++len;
			foreach (v; edges[u])
			{
				--cnt[v];
				if (cnt[v] == 0)
					q ~= v;
			}
		}
		return len == N;
	}
	auto ans = binarySearch!(f)(0, Q+1);
	if (ans == Q)
		ans = -1;
	else
		++ans;

	writeln(ans);
	stdout.flush;
	debug readln;
}
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