結果

問題 No.1244 Black Segment
ユーザー Jumbo_kprJumbo_kpr
提出日時 2020-10-02 23:15:35
言語 C++14
(gcc 13.3.0 + boost 1.87.0)
結果
AC  
実行時間 54 ms / 2,000 ms
コード長 3,173 bytes
コンパイル時間 1,677 ms
コンパイル使用メモリ 134,236 KB
実行使用メモリ 22,952 KB
最終ジャッジ日時 2024-07-17 23:38:20
合計ジャッジ時間 3,940 ms
ジャッジサーバーID
(参考情報)
judge1 / judge3
このコードへのチャレンジ
(要ログイン)
ファイルパターン 結果
sample AC * 3
other AC * 36
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

#pragma GCC optimize("Ofast")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx")
#pragma GCC optimize("unroll-loops")
//#pragma warning(disable : 4996)
//#define ATCODER
#ifdef ATCODER
#include<atcoder/all>
using namespace atcoder;
#endif
#include <algorithm>
#include <utility>
#include <vector>
#ifdef _MSC_VER
#include <intrin.h>
#define __builtin_popcount __popcnt
#define __builtin_popcountll __popcnt64
#endif
#include <limits.h>
#include <math.h>
#include <time.h>
#include <algorithm>
#include <array>
#include <bitset>
#include <cassert>
#include <complex>
#include <cstdio>
#include <cstring>
#include <functional>
#include <iomanip>
#include <iostream>
#include <iterator>
#include <map>
#include <numeric>
#include <queue>
#include <random>
#include <set>
#include <stack>
#include <string>
#include <unordered_map>
#include <unordered_set>
#include <vector>
using namespace std;
#define REP(i, n) for (int i = 0; i < (n); ++i)
#define REPR(i, n) for (int i = n - 1; i >= 0; --i)
#define FOR(i, m, n) for (int i = m; i < n; ++i)
#define FORR(i, m, n) for (int i = m - 1; i >= n; --i)
#define SORT(v, n) sort(v, v + n);
#define VSORT(v) sort(v.begin(), v.end());
#define REVERSE(v, n) reverse(v, v + n);
#define VREVERSE(v) reverse(v.begin(), v.end())
#define ll long long
#define print(x) cout << (x) << '\n'
#define pe(x) cout << (x) << " "
#define DEBUG(x) cout << #x << ": " << x << endl
#define lb(v, n) lower_bound(v.begin(), v.end(), (n))
#define ub(v, n) upper_bound(v.begin(), v.end(), (n))
#define int long long
//#define double long double
#define all(x) (x).begin(), (x).end()
#define print_space(v) REP(i, v.size()) cout << v[i] << " \n"[i==(int)v.size()-1]
template <typename T1, typename T2> inline void chmin(T1 & a, T2 b) { if (a > b) a = b; }
template <typename T1, typename T2> inline void chmax(T1& a, T2 b) { if (a < b) a = b; }
typedef pair<int, int> pii;
typedef pair<long long, long long> pll;
std::random_device rd;
std::mt19937 mt(rd());
constexpr ll MOD = 998244353;
constexpr int MAX = 440000;
const double pi = acos(-1);
constexpr double EPS = 1e-8;
constexpr ll LINF = 1e17 + 1;
constexpr int INF = 1e9 + 1;
using P = pii;
struct edge { int to, cost; };
int V;//
vector<edge>G[MAX];
int d[MAX];//
void dijkstra(int s) {
priority_queue<P, vector<P>, greater<P>>que;
fill(d, d + V, INF);
d[s] = 0;
que.push(P(0, s));
while (!que.empty()) {
P p = que.top(); que.pop();
int v = p.second;
if (d[v] < p.first)continue;
for (int i = 0; i < G[v].size(); i++) {
edge e = G[v][i];
if (d[e.to] > d[v] + e.cost) {
d[e.to] = d[v] + e.cost;
que.push(P(d[e.to], e.to));
}
}
}
}
void solve() {
int N, M, A, B; cin >> N >> M >> A >> B;
int pa = A;
V = N+1;
B -= A;
A = 0;
B++;
vector<pii>vp;
REP(i, M) {
int l, r; cin >> l >> r;
l -= pa, r -= pa;
r++;
l = max(0LL, l);
r = min(B, r);
if (r <= 0)continue;
G[l].push_back({ r,1 });
G[r].push_back({ l,1 });
}
dijkstra(0);
if (d[B] == INF)print(-1);
else print(d[B]);
}
signed main() {
cin.tie(0);
ios::sync_with_stdio(false);
//int q;
//cin >> q;
//while (q--)
solve();
}
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