結果

問題 No.1244 Black Segment
ユーザー heno239heno239
提出日時 2020-10-03 19:45:06
言語 C++14
(gcc 12.3.0 + boost 1.83.0)
結果
AC  
実行時間 89 ms / 2,000 ms
コード長 3,646 bytes
コンパイル時間 1,463 ms
コンパイル使用メモリ 120,028 KB
実行使用メモリ 82,504 KB
最終ジャッジ日時 2024-07-18 04:59:39
合計ジャッジ時間 5,143 ms
ジャッジサーバーID
(参考情報)
judge2 / judge1
このコードへのチャレンジ
(要ログイン)

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 39 ms
75,136 KB
testcase_01 AC 41 ms
75,080 KB
testcase_02 AC 41 ms
75,008 KB
testcase_03 AC 41 ms
75,136 KB
testcase_04 AC 40 ms
75,008 KB
testcase_05 AC 41 ms
75,136 KB
testcase_06 AC 42 ms
75,136 KB
testcase_07 AC 42 ms
75,076 KB
testcase_08 AC 42 ms
75,136 KB
testcase_09 AC 42 ms
75,136 KB
testcase_10 AC 41 ms
75,008 KB
testcase_11 AC 40 ms
75,136 KB
testcase_12 AC 42 ms
75,008 KB
testcase_13 AC 42 ms
75,328 KB
testcase_14 AC 61 ms
77,184 KB
testcase_15 AC 41 ms
75,204 KB
testcase_16 AC 61 ms
77,252 KB
testcase_17 AC 42 ms
75,464 KB
testcase_18 AC 63 ms
78,208 KB
testcase_19 AC 84 ms
79,048 KB
testcase_20 AC 82 ms
79,428 KB
testcase_21 AC 73 ms
79,428 KB
testcase_22 AC 77 ms
79,360 KB
testcase_23 AC 79 ms
79,488 KB
testcase_24 AC 77 ms
80,000 KB
testcase_25 AC 77 ms
79,936 KB
testcase_26 AC 76 ms
79,744 KB
testcase_27 AC 89 ms
82,372 KB
testcase_28 AC 79 ms
80,256 KB
testcase_29 AC 77 ms
80,064 KB
testcase_30 AC 80 ms
80,000 KB
testcase_31 AC 78 ms
79,684 KB
testcase_32 AC 79 ms
79,872 KB
testcase_33 AC 79 ms
79,688 KB
testcase_34 AC 83 ms
79,744 KB
testcase_35 AC 83 ms
82,504 KB
testcase_36 AC 84 ms
82,432 KB
testcase_37 AC 76 ms
81,096 KB
testcase_38 AC 75 ms
80,836 KB
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 #

#include<iostream>
#include<string>
#include<cstdio>
#include<vector>
#include<cmath>
#include<algorithm>
#include<functional>
#include<iomanip>
#include<queue>
#include<ciso646>
#include<random>
#include<map>
#include<set>
#include<bitset>
#include<stack>
#include<unordered_map>
#include<utility>
#include<cassert>
#include<complex>
#include<numeric>
#include<array>
using namespace std;

//#define int long long
typedef long long ll;

typedef unsigned long long ul;
typedef unsigned int ui;
constexpr ll mod = 998244353;
const ll INF = mod * mod;
typedef pair<int, int>P;
#define stop char nyaa;cin>>nyaa;
#define rep(i,n) for(int i=0;i<n;i++)
#define per(i,n) for(int i=n-1;i>=0;i--)
#define Rep(i,sta,n) for(int i=sta;i<n;i++)
#define rep1(i,n) for(int i=1;i<=n;i++)
#define per1(i,n) for(int i=n;i>=1;i--)
#define Rep1(i,sta,n) for(int i=sta;i<=n;i++)
#define all(v) (v).begin(),(v).end()
typedef pair<ll, ll> LP;
typedef long double ld;
typedef pair<ld, ld> LDP;
const ld eps = 1e-12;
const ld pi = acosl(-1.0);

ll mod_pow(ll x, ll n, ll m = mod) {
	ll res = 1;
	while (n) {
		if (n & 1)res = res * x % m;
		x = x * x % m; n >>= 1;
	}
	return res;
}
struct modint {
	ll n;
	modint() :n(0) { ; }
	modint(ll m) :n(m) {
		if (n >= mod)n %= mod;
		else if (n < 0)n = (n % mod + mod) % mod;
	}
	operator int() { return n; }
};
bool operator==(modint a, modint b) { return a.n == b.n; }
modint operator+=(modint& a, modint b) { a.n += b.n; if (a.n >= mod)a.n -= mod; return a; }
modint operator-=(modint& a, modint b) { a.n -= b.n; if (a.n < 0)a.n += mod; return a; }
modint operator*=(modint& a, modint b) { a.n = ((ll)a.n * b.n) % mod; return a; }
modint operator+(modint a, modint b) { return a += b; }
modint operator-(modint a, modint b) { return a -= b; }
modint operator*(modint a, modint b) { return a *= b; }
modint operator^(modint a, ll n) {
	if (n == 0)return modint(1);
	modint res = (a * a) ^ (n / 2);
	if (n % 2)res = res * a;
	return res;
}

ll inv(ll a, ll p) {
	return (a == 1 ? 1 : (1 - p * inv(p % a, a)) / a + p);
}
modint operator/(modint a, modint b) { return a * modint(inv(b, mod)); }

const int max_n = 1 << 22;
modint fact[max_n], factinv[max_n];
void init_f() {
	fact[0] = modint(1);
	for (int i = 0; i < max_n - 1; i++) {
		fact[i + 1] = fact[i] * modint(i + 1);
	}
	factinv[max_n - 1] = modint(1) / fact[max_n - 1];
	for (int i = max_n - 2; i >= 0; i--) {
		factinv[i] = factinv[i + 1] * modint(i + 1);
	}
}
modint comb(int a, int b) {
	if (a < 0 || b < 0 || a < b)return 0;
	return fact[a] * factinv[b] * factinv[a - b];
}

modint calc(int n, int s) {
	if (n == 0 && s == 0)return 1;
	else if (n == 0)return 0;
	return comb(n - 1 + s + s, s) - comb(n - 1 + s + s, s - 1);
}

vector<int> le[1 << 17];
vector<int> ri[1 << 17];
void solve() {
	int n, m, a, b; cin >> n >> m >> a >> b; a--; b--;
	vector<int> l(m), r(m);
	rep(i, m) {
		cin >> l[i] >> r[i]; l[i]--; r[i]--;
		le[l[i]].push_back(r[i] + 1);
		ri[r[i]+1].push_back(l[i]);
	}
	vector<int> dist(n + 1, mod);
	queue<int> q;
	rep(i, a + 1) {
		q.push(i);
		dist[i] = 0;
	}
	while (!q.empty()) {
		int id = q.front(); q.pop();
		for (int to : le[id]) {
			if (dist[id] + 1 < dist[to]) {
				dist[to] = dist[id] + 1; q.push(to);
			}
		}
		for (int to : ri[id]) {
			if (dist[id] + 1 < dist[to]) {
				dist[to] = dist[id] + 1; q.push(to);
			}
		}
	}
	int ans = mod;
	for (int i = b + 1; i <= n; i++)ans = min(ans, dist[i]);
	if (ans == mod)ans = -1;
	cout << ans << "\n";
}

signed main() {
	ios::sync_with_stdio(false);
	cin.tie(0);
	//cout << fixed << setprecision(15);
	//init_f();
	//init();
	//expr();
	//int t; cin >> t; rep(i, t)
	solve();
	return 0;
}
0