답안 #937464

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
937464	2024-03-04T06:02:08 Z	william950615	Cat Exercise (JOI23_ho_t4)	C++14	41 / 100	135 ms	51232 KB

Main


#include<bits/stdc++.h>
using namespace std;
#define F first
#define S second
#define mkp make_pair
#define MEM(x) memset(x,0,sizeof(x))
#define ALL(x) begin(x), end(x)
#define PH push
#define PB push_back
#define REP(i,N) for( int i = 0; i <(N); ++i )
#define FOR(i,a,b) for( int i = (a); i <= (b); ++i )

typedef long long ll;
typedef pair<ll,ll> pll;
typedef pair<int,int> pii;
template<typename T>
using V = vector<T>;

#ifdef LOCAL
int __lg( int x ) {
	return 31 - __builtin_clz( x );
}
#endif
struct DSU {
	const int N;
	V<int> fth;

	int find( int a ) { return a == fth[a] ? a : fth[a] = find(fth[a]);};
	int merge( int a, int b ) { // make a be father
		const int fa = find( a ), fb = find( b );
		if( fa == fb ) return 0;
		fth[ fb ] = fa;
		return 1;
	}
	DSU( int N ) : N(N) {
		fth.assign( N+1, 0 );
		iota( ALL(fth), 0 );
	}
};

struct LCA {
	const int N;
	int lgN, tm;
	V<int> dis;
	V<int> tin, tout;

	V<V<int>> fth;

	V<V<int>> G;


	void dfs( int cur, int par ) {
		tin[cur]=++tm;
		for( int i = 1; i < lgN; ++i ) 
			fth[ i ][ cur ] = fth[ i-1 ][ fth[i-1][cur] ];

		for( auto &i : G[cur] ) {
			if( i == par ) continue;
			fth[ 0 ][ i ] = cur;
			dis[ i ] = dis[ cur ] + 1;
			dfs( i, cur );
		}	
		tout[cur]=++tm;
	}

	bool isfather( int a, int b ) { 
		return tin[a] <= tin[b] && tout[b] <= tout[a];
	}

	int lca( int a, int b ) {
		if( isfather(a,b) ) return a;
		if( isfather(b,a) ) return b;
		for( int i = lgN-1; i >= 0; --i ) {
			if( !isfather( fth[ i ][ a ], b ) )
				a = fth[ i ][ a];
		}	
		return fth[ 0 ][ a ];
	}


	int Dis( int a, int b ) {
		return dis[a]+dis[b]-2*dis[lca(a,b)];
	}



	LCA( V<V<int>>&_G, int N ) : N(N) {
		tm = 0;
		lgN = __lg( N ) + 1;
		tin.assign( N+1, 0 );
		tout.assign( N+1, 0 );
		fth.assign( lgN, V<int>(N+1,0));
		dis.assign( N+1, 0 );

		G=_G;
		dfs( 1, 0 );
		V<V<int>>().swap( G );
	}	
};

void solve() {
	int N; cin >> N;
	V<int> NodeOf(N+1,0);
	FOR(i,1,N) {
		int p; cin >> p;
		NodeOf[ p ] = i;
	}

	V<V<int>> G(N+1);

	FOR(i,2,N) {
		int a, b; cin >> a >> b;
		G[a].PB( b );
		G[b].PB( a );
	}

	LCA lca(G, N);
	DSU dsu(N+1);

	V<int> vis(N+1,0);
	V<ll> dp(N+1,0);

	FOR(_,1,N) {
		auto nd = NodeOf[_];


		for( auto&j : G[nd] ) {
			if( !vis[j] ) continue;
			auto to  = dsu.find( j );
			dp[ nd ] = max( dp[ nd ], dp[ to ] + lca.Dis(nd,to));
			dsu.merge( nd, j );
		}

		vis[ nd ] = true;
	}
	cout << *max_element( ALL(dp) ) << '\n';
}

int main () {
	int T=1;
#ifdef LOCAL
	freopen( "input.txt", "r", stdin );
	freopen( "output.txt", "w", stdout );
	cin >> T;
#else
	ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
#endif
	while(T--) solve();
}

Subtask #1
7.0 / 7.0

#	결과	실행 시간	메모리	Grader output
1	Correct	0 ms	348 KB	Output is correct
2	Correct	0 ms	348 KB	Output is correct
3	Correct	0 ms	348 KB	Output is correct
4	Correct	0 ms	348 KB	Output is correct
5	Correct	0 ms	348 KB	Output is correct
6	Correct	0 ms	348 KB	Output is correct
7	Correct	0 ms	348 KB	Output is correct
8	Correct	0 ms	348 KB	Output is correct
9	Correct	1 ms	348 KB	Output is correct
10	Correct	0 ms	344 KB	Output is correct

Subtask #2
7.0 / 7.0

#	결과	실행 시간	메모리	Grader output
1	Correct	0 ms	348 KB	Output is correct
2	Correct	0 ms	348 KB	Output is correct
3	Correct	0 ms	348 KB	Output is correct
4	Correct	0 ms	348 KB	Output is correct
5	Correct	0 ms	348 KB	Output is correct
6	Correct	0 ms	348 KB	Output is correct
7	Correct	0 ms	348 KB	Output is correct
8	Correct	0 ms	348 KB	Output is correct
9	Correct	1 ms	348 KB	Output is correct
10	Correct	0 ms	344 KB	Output is correct
11	Correct	1 ms	348 KB	Output is correct
12	Correct	0 ms	348 KB	Output is correct
13	Correct	0 ms	348 KB	Output is correct
14	Correct	0 ms	348 KB	Output is correct
15	Correct	1 ms	348 KB	Output is correct
16	Correct	0 ms	348 KB	Output is correct
17	Correct	0 ms	348 KB	Output is correct

Subtask #3
7.0 / 7.0

#	결과	실행 시간	메모리	Grader output
1	Correct	0 ms	348 KB	Output is correct
2	Correct	0 ms	348 KB	Output is correct
3	Correct	0 ms	348 KB	Output is correct
4	Correct	0 ms	348 KB	Output is correct
5	Correct	0 ms	348 KB	Output is correct
6	Correct	0 ms	348 KB	Output is correct
7	Correct	0 ms	348 KB	Output is correct
8	Correct	0 ms	348 KB	Output is correct
9	Correct	1 ms	348 KB	Output is correct
10	Correct	0 ms	344 KB	Output is correct
11	Correct	1 ms	348 KB	Output is correct
12	Correct	0 ms	348 KB	Output is correct
13	Correct	0 ms	348 KB	Output is correct
14	Correct	0 ms	348 KB	Output is correct
15	Correct	1 ms	348 KB	Output is correct
16	Correct	0 ms	348 KB	Output is correct
17	Correct	0 ms	348 KB	Output is correct
18	Correct	2 ms	1372 KB	Output is correct
19	Correct	2 ms	1372 KB	Output is correct
20	Correct	3 ms	1372 KB	Output is correct
21	Correct	2 ms	1368 KB	Output is correct
22	Correct	2 ms	1372 KB	Output is correct
23	Correct	2 ms	1372 KB	Output is correct
24	Correct	2 ms	1624 KB	Output is correct

Subtask #4
0 / 10.0

#	결과	실행 시간	메모리	Grader output
1	Correct	0 ms	348 KB	Output is correct
2	Correct	0 ms	348 KB	Output is correct
3	Correct	0 ms	348 KB	Output is correct
4	Correct	0 ms	348 KB	Output is correct
5	Correct	0 ms	348 KB	Output is correct
6	Correct	0 ms	348 KB	Output is correct
7	Correct	0 ms	348 KB	Output is correct
8	Correct	0 ms	348 KB	Output is correct
9	Correct	1 ms	348 KB	Output is correct
10	Correct	0 ms	344 KB	Output is correct
11	Correct	1 ms	348 KB	Output is correct
12	Correct	0 ms	348 KB	Output is correct
13	Correct	0 ms	348 KB	Output is correct
14	Correct	0 ms	348 KB	Output is correct
15	Correct	1 ms	348 KB	Output is correct
16	Correct	0 ms	348 KB	Output is correct
17	Correct	0 ms	348 KB	Output is correct
18	Correct	2 ms	1372 KB	Output is correct
19	Correct	2 ms	1372 KB	Output is correct
20	Correct	3 ms	1372 KB	Output is correct
21	Correct	2 ms	1368 KB	Output is correct
22	Correct	2 ms	1372 KB	Output is correct
23	Correct	2 ms	1372 KB	Output is correct
24	Correct	2 ms	1624 KB	Output is correct
25	Correct	0 ms	348 KB	Output is correct
26	Correct	3 ms	1372 KB	Output is correct
27	Incorrect	3 ms	1372 KB	Output isn't correct
28	Halted	0 ms	0 KB	-

Subtask #5
20.0 / 20.0

#	결과	실행 시간	메모리	Grader output
1	Correct	0 ms	348 KB	Output is correct
2	Correct	0 ms	348 KB	Output is correct
3	Correct	0 ms	348 KB	Output is correct
4	Correct	0 ms	348 KB	Output is correct
5	Correct	0 ms	348 KB	Output is correct
6	Correct	0 ms	348 KB	Output is correct
7	Correct	0 ms	348 KB	Output is correct
8	Correct	0 ms	348 KB	Output is correct
9	Correct	1 ms	348 KB	Output is correct
10	Correct	0 ms	344 KB	Output is correct
11	Correct	1 ms	348 KB	Output is correct
12	Correct	0 ms	348 KB	Output is correct
13	Correct	0 ms	348 KB	Output is correct
14	Correct	0 ms	348 KB	Output is correct
15	Correct	1 ms	348 KB	Output is correct
16	Correct	0 ms	348 KB	Output is correct
17	Correct	0 ms	348 KB	Output is correct
18	Correct	2 ms	1372 KB	Output is correct
19	Correct	2 ms	1372 KB	Output is correct
20	Correct	3 ms	1372 KB	Output is correct
21	Correct	2 ms	1368 KB	Output is correct
22	Correct	2 ms	1372 KB	Output is correct
23	Correct	2 ms	1372 KB	Output is correct
24	Correct	2 ms	1624 KB	Output is correct
25	Correct	109 ms	47408 KB	Output is correct
26	Correct	113 ms	51012 KB	Output is correct
27	Correct	133 ms	50992 KB	Output is correct
28	Correct	135 ms	51232 KB	Output is correct
29	Correct	132 ms	51148 KB	Output is correct
30	Correct	133 ms	51200 KB	Output is correct
31	Correct	129 ms	51000 KB	Output is correct

Subtask #6
0 / 23.0

#	결과	메모리	Grader output
1	Correct	348 KB	Output is correct
2	Incorrect	348 KB	Output isn't correct
3	Halted	0 KB	-

Subtask #7
0 / 26.0

#	결과	실행 시간	메모리	Grader output
1	Correct	0 ms	348 KB	Output is correct
2	Correct	0 ms	348 KB	Output is correct
3	Correct	0 ms	348 KB	Output is correct
4	Correct	0 ms	348 KB	Output is correct
5	Correct	0 ms	348 KB	Output is correct
6	Correct	0 ms	348 KB	Output is correct
7	Correct	0 ms	348 KB	Output is correct
8	Correct	0 ms	348 KB	Output is correct
9	Correct	1 ms	348 KB	Output is correct
10	Correct	0 ms	344 KB	Output is correct
11	Correct	1 ms	348 KB	Output is correct
12	Correct	0 ms	348 KB	Output is correct
13	Correct	0 ms	348 KB	Output is correct
14	Correct	0 ms	348 KB	Output is correct
15	Correct	1 ms	348 KB	Output is correct
16	Correct	0 ms	348 KB	Output is correct
17	Correct	0 ms	348 KB	Output is correct
18	Correct	2 ms	1372 KB	Output is correct
19	Correct	2 ms	1372 KB	Output is correct
20	Correct	3 ms	1372 KB	Output is correct
21	Correct	2 ms	1368 KB	Output is correct
22	Correct	2 ms	1372 KB	Output is correct
23	Correct	2 ms	1372 KB	Output is correct
24	Correct	2 ms	1624 KB	Output is correct
25	Correct	0 ms	348 KB	Output is correct
26	Correct	3 ms	1372 KB	Output is correct
27	Incorrect	3 ms	1372 KB	Output isn't correct
28	Halted	0 ms	0 KB	-

답안 #937464

Compilation message

Subtask #1 7.0 / 7.0

Subtask #2 7.0 / 7.0

Subtask #3 7.0 / 7.0

Subtask #4 0 / 10.0

Subtask #5 20.0 / 20.0

Subtask #6 0 / 23.0

Subtask #7 0 / 26.0

Subtask #1
7.0 / 7.0

Subtask #2
7.0 / 7.0

Subtask #3
7.0 / 7.0

Subtask #4
0 / 10.0

Subtask #5
20.0 / 20.0

Subtask #6
0 / 23.0

Subtask #7
0 / 26.0