Submission #1750275


Source Code Expand

#include <set>
#include <map>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <iostream>
#include <algorithm>
typedef long long ll ;
#define rep(i, a, b) for (int i = a; i <= b; ++ i) 
const int N = 100005 ;
using namespace std ;
int n, d[N << 1] ; 
map <int, map<int, int> > cnt ;
multiset <int> E[N] ;
set <pair<int, int> > Q ;

void add(int x, int y) {
	E[x].insert(y) ;
	int tmp = ++ cnt[x][y] ;
	if (tmp > 1) Q.insert(make_pair(min(x, y), max(x, y))) ;
}

void del(int x, int y) {
	E[x].erase(E[x].find(y)) ;
	int tmp = -- cnt[x][y] ;
	if (tmp < 2) Q.erase(make_pair(min(x, y), max(x, y))) ;
}

bool check() {
	rep(k, 1, n - 1) {
		if (Q.empty()) return false ;
		pair <int, int> u = *Q.begin() ;
		Q.erase(u) ;
		int x = u.first, y = u.second ;
		del(x, y), del(x, y), del(y, x), del(y, x) ;
		if (E[x].size() > E[y].size()) swap(x, y) ;
		std :: multiset <int> :: iterator it ;
		d[0] = 0 ;
		for (it = E[x].begin() ; it != E[x].end() ; it ++) {
			int v = *it ;
			add(y, v), add(v, y) ;
			d[++ d[0]] = v ;
		}
		rep(i, 1, d[0]) {
			del(x, d[i]), del(d[i], x) ;
		}

	}
	return true ;
}

int main() {
	scanf("%d", &n) ;
	int x, y ;
	rep(i, 1, n - 1) {
		scanf("%d%d", &x, &y) ;
		add(x, y), add(y, x) ;
	}
	rep(i, 1, n - 1) {
		scanf("%d%d", &x, &y) ;
		add(x, y), add(y, x) ;
	}
	if (check()) printf("YES\n") ;
		else printf("NO\n") ;
	return 0 ; 
}

Submission Info

Submission Time
Task E - Blue and Red Tree
User mjy0724
Language C++14 (GCC 5.4.1)
Score 1400
Code Size 1442 Byte
Status AC
Exec Time 1054 ms
Memory 54784 KB

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:53:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &n) ;
                  ^
./Main.cpp:56:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d", &x, &y) ;
                         ^
./Main.cpp:60:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d", &x, &y) ;
                         ^

Judge Result

Set Name Sample All
Score / Max Score 0 / 0 1400 / 1400
Status
AC × 3
AC × 53
Set Name Test Cases
Sample sample1.txt, sample2.txt, sample3.txt
All sample1.txt, sample2.txt, sample3.txt, in1.txt, in10.txt, in11.txt, in12.txt, in13.txt, in14.txt, in15.txt, in16.txt, in17.txt, in18.txt, in19.txt, in2.txt, in20.txt, in21.txt, in22.txt, in23.txt, in24.txt, in25.txt, in26.txt, in27.txt, in28.txt, in29.txt, in3.txt, in30.txt, in31.txt, in32.txt, in33.txt, in34.txt, in35.txt, in36.txt, in37.txt, in38.txt, in39.txt, in4.txt, in40.txt, in41.txt, in42.txt, in43.txt, in44.txt, in45.txt, in46.txt, in47.txt, in5.txt, in6.txt, in7.txt, in8.txt, in9.txt, sample1.txt, sample2.txt, sample3.txt
Case Name Status Exec Time Memory
in1.txt AC 3 ms 4992 KB
in10.txt AC 385 ms 51840 KB
in11.txt AC 860 ms 50048 KB
in12.txt AC 910 ms 50048 KB
in13.txt AC 903 ms 50048 KB
in14.txt AC 885 ms 50048 KB
in15.txt AC 879 ms 50048 KB
in16.txt AC 894 ms 50048 KB
in17.txt AC 867 ms 50048 KB
in18.txt AC 885 ms 50048 KB
in19.txt AC 869 ms 50048 KB
in2.txt AC 3 ms 4992 KB
in20.txt AC 870 ms 50048 KB
in21.txt AC 859 ms 50176 KB
in22.txt AC 864 ms 50176 KB
in23.txt AC 851 ms 50176 KB
in24.txt AC 859 ms 50176 KB
in25.txt AC 867 ms 50176 KB
in26.txt AC 893 ms 50048 KB
in27.txt AC 878 ms 50048 KB
in28.txt AC 885 ms 50048 KB
in29.txt AC 879 ms 50048 KB
in3.txt AC 3 ms 4992 KB
in30.txt AC 914 ms 50048 KB
in31.txt AC 984 ms 53120 KB
in32.txt AC 1001 ms 53120 KB
in33.txt AC 977 ms 53120 KB
in34.txt AC 978 ms 53120 KB
in35.txt AC 985 ms 53120 KB
in36.txt AC 980 ms 53120 KB
in37.txt AC 982 ms 53120 KB
in38.txt AC 919 ms 52992 KB
in39.txt AC 906 ms 53120 KB
in4.txt AC 387 ms 51840 KB
in40.txt AC 853 ms 54784 KB
in41.txt AC 1031 ms 53120 KB
in42.txt AC 1054 ms 53120 KB
in43.txt AC 1031 ms 53120 KB
in44.txt AC 1019 ms 53120 KB
in45.txt AC 1029 ms 53120 KB
in46.txt AC 905 ms 53120 KB
in47.txt AC 851 ms 53120 KB
in5.txt AC 387 ms 51840 KB
in6.txt AC 907 ms 53120 KB
in7.txt AC 393 ms 51840 KB
in8.txt AC 386 ms 51840 KB
in9.txt AC 389 ms 51840 KB
sample1.txt AC 3 ms 4992 KB
sample2.txt AC 3 ms 4992 KB
sample3.txt AC 3 ms 4992 KB