結果
問題 | No.583 鉄道同好会 |
ユーザー | kitakitalily |
提出日時 | 2019-04-07 16:31:31 |
言語 | Java21 (openjdk 21) |
結果 |
WA
|
実行時間 | - |
コード長 | 5,152 bytes |
コンパイル時間 | 4,076 ms |
コンパイル使用メモリ | 90,788 KB |
実行使用メモリ | 65,812 KB |
最終ジャッジ日時 | 2024-06-27 05:45:49 |
合計ジャッジ時間 | 11,719 ms |
ジャッジサーバーID (参考情報) |
judge3 / judge5 |
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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 | 134 ms
49,628 KB |
testcase_01 | AC | 132 ms
48,968 KB |
testcase_02 | AC | 133 ms
49,000 KB |
testcase_03 | AC | 133 ms
49,364 KB |
testcase_04 | AC | 134 ms
49,632 KB |
testcase_05 | AC | 129 ms
49,188 KB |
testcase_06 | WA | - |
testcase_07 | AC | 121 ms
48,336 KB |
testcase_08 | AC | 117 ms
48,076 KB |
testcase_09 | AC | 139 ms
49,056 KB |
testcase_10 | AC | 179 ms
49,408 KB |
testcase_11 | AC | 526 ms
54,808 KB |
testcase_12 | AC | 495 ms
55,508 KB |
testcase_13 | AC | 574 ms
55,200 KB |
testcase_14 | AC | 574 ms
55,116 KB |
testcase_15 | AC | 623 ms
55,144 KB |
testcase_16 | AC | 778 ms
63,692 KB |
testcase_17 | AC | 873 ms
64,736 KB |
testcase_18 | WA | - |
ソースコード
import java.util.Scanner; import java.util.Collections; import java.util.List; import java.util.ArrayList; import java.util.Arrays; import java.util.Queue; import java.util.ArrayDeque; import java.util.Deque; import java.util.PriorityQueue; import java.util.Set; import java.util.Map; import java.util.HashMap; import java.util.TreeSet; import java.util.Comparator; public class Main { static int mod = 1000000007; static int size = 200000; static long[] fac = new long[size]; static long[] finv = new long[size]; static long[] inv = new long[size]; static int INF = Integer.MAX_VALUE; static int count = 0; static int n; public static void main(String[] args){ Scanner scanner = new Scanner(System.in); int n = scanner.nextInt(); int m = scanner.nextInt(); int[] a = new int[m]; int[] b = new int[m]; int[] count = new int[n]; boolean flag = true; for(int i = 0; i < m; i++){ a[i] = scanner.nextInt(); b[i] = scanner.nextInt(); count[a[i]]++; count[b[i]]++; } Map<Integer,Integer> map = new HashMap<Integer,Integer>(); for(int i = 0; i < m; i++){ if(!map.containsKey(a[i])){ map.put(a[i],1); }else{ map.put(a[i],map.get(a[i])+1); } if(!map.containsKey(b[i])){ map.put(b[i],1); }else{ map.put(b[i],map.get(b[i])+1); } } int cnt1 = 0; int cnt2 = 0; for(int i = 0; i < n; i++){ if(count[i] % 2 != 0){ cnt1++; } if(count[i] % 2 == 0){ cnt2++; } } UnionFind uf = new UnionFind(n); for(int i = 0; i < m; i++){ uf.unite(a[i],b[i]); } if(uf.size(0) != map.size()){ System.out.println("NO"); }else{ if(cnt1 == 2 || cnt2 == n){ System.out.println("YES"); }else{ System.out.println("NO"); } } } static class Pair implements Comparable<Pair>{ int x, y; Pair(int a, int b){ x = a; y = b; } @Override public boolean equals(Object o){ if (this == o) return true; if (!(o instanceof Pair)) return false; Pair p = (Pair) o; return x == p.x && y == p.y; } @Override public int compareTo(Pair p){ return x == p.x ? y - p.y : x - p.x; //xで昇順にソート //return (x == p.x ? y - p.y : x - p.x) * -1; //xで降順にソート //return y == p.y ? x - p.x : y - p.y;//yで昇順にソート //return (y == p.y ? x - p.x : y - p.y)*-1;//yで降順にソート } } static class Edge implements Comparable<Edge>{ int from; int to; int cost; Edge(int from, int to,int cost){ this.from = from; this.to = to; this.cost = cost; } public int compareTo(Edge e) { return this.cost - e.cost; } } //繰り返し二乗法 public static long pow(long x, long n){ long ans = 1; while(n > 0){ if((n & 1) == 1){ ans = ans * x; ans %= mod; } x = x * x % mod; n >>= 1; } return ans; } //fac, inv, finvテーブルの初期化、これ使う場合はinitComb()で初期化必要 public static void initComb(){ fac[0] = finv[0] = inv[0] = fac[1] = finv[1] = inv[1] = 1; for (int i = 2; i < size; ++i) { fac[i] = fac[i - 1] * i % mod; inv[i] = mod - (mod / i) * inv[(int) (mod % i)] % mod; finv[i] = finv[i - 1] * inv[i] % mod; } } //nCk % mod public static long comb(int n, int k){ return fac[n] * finv[k] % mod * finv[n - k] % mod; } //n! % mod public static long fact(int n){ return fac[n]; } //(n!)^-1 with % mod public static long finv(int n){ return finv[n]; } static class UnionFind { int[] parent; public UnionFind(int size) { parent = new int[size]; Arrays.fill(parent, -1); } public boolean unite(int x, int y) { x = root(x); y = root(y); if (x != y) { if (parent[y] < parent[x]) { int tmp = y; y = x; x = tmp; } parent[x] += parent[y]; parent[y] = x; return true; } return false; } public boolean same(int x, int y) { return root(x) == root(y); } public int root(int x) { return parent[x] < 0 ? x : (parent[x] = root(parent[x])); } public int size(int x) { return -parent[root(x)]; } } public static int upperBound(long[] a,long val){ return upperBound(a,0,a.length,val); } public static int upperBound(long[] a,int l,int r,long val){ if(r-l==1){ if(a[l]>val) return l; return r; } int mid=(l+r)/2; if(a[mid]>val){ return upperBound(a,l,mid,val); }else{ return upperBound(a,mid,r,val); } } public static int lowerBound(long[] a,long val){ return lowerBound(a,0,a.length,val); } public static int lowerBound(long[] a,int l,int r,long val){ if(r-l==1){ if(a[l]<val) return r; return l; } int mid=(l+r)/2; if(a[mid]<val){ return lowerBound(a,mid,r,val); }else{ return lowerBound(a,l,mid,val); } } //n,mの最大公約数 public static int gcd(int n, int m){ if(m > n) return gcd(m,n); if(m == 0) return n; return gcd(m, n%m); } }