oj.uz

Submission #937468

# Submission time Handle Problem Language Result Execution time Memory
937468 2024-03-04T06:23:03 Z william950615 Cat Exercise (JOI23_ho_t4) C++14
100 / 100
 332 ms 48024 KB 

#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 );
		tin[0] = 0;
		tout[0] = 1000000000;
	}	
};

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 << dp[ NodeOf[N] ] << '\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

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 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 0 ms 348 KB Output is correct
10 Correct 0 ms 596 KB Output is correct

Subtask #2
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 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 0 ms 348 KB Output is correct
10 Correct 0 ms 596 KB Output is correct
11 Correct 0 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 0 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

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 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 0 ms 348 KB Output is correct
10 Correct 0 ms 596 KB Output is correct
11 Correct 0 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 0 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 1368 KB Output is correct
19 Correct 2 ms 1372 KB Output is correct
20 Correct 2 ms 1368 KB Output is correct
21 Correct 2 ms 1372 KB Output is correct
22 Correct 3 ms 1372 KB Output is correct
23 Correct 2 ms 1372 KB Output is correct
24 Correct 2 ms 1372 KB Output is correct

Subtask #4
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 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 0 ms 348 KB Output is correct
10 Correct 0 ms 596 KB Output is correct
11 Correct 0 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 0 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 1368 KB Output is correct
19 Correct 2 ms 1372 KB Output is correct
20 Correct 2 ms 1368 KB Output is correct
21 Correct 2 ms 1372 KB Output is correct
22 Correct 3 ms 1372 KB Output is correct
23 Correct 2 ms 1372 KB Output is correct
24 Correct 2 ms 1372 KB Output is correct
25 Correct 0 ms 348 KB Output is correct
26 Correct 3 ms 1372 KB Output is correct
27 Correct 2 ms 1372 KB Output is correct
28 Correct 3 ms 1372 KB Output is correct
29 Correct 3 ms 1372 KB Output is correct
30 Correct 3 ms 1372 KB Output is correct
31 Correct 3 ms 1624 KB Output is correct
32 Correct 3 ms 1372 KB Output is correct
33 Correct 3 ms 1232 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 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 0 ms 348 KB Output is correct
10 Correct 0 ms 596 KB Output is correct
11 Correct 0 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 0 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 1368 KB Output is correct
19 Correct 2 ms 1372 KB Output is correct
20 Correct 2 ms 1368 KB Output is correct
21 Correct 2 ms 1372 KB Output is correct
22 Correct 3 ms 1372 KB Output is correct
23 Correct 2 ms 1372 KB Output is correct
24 Correct 2 ms 1372 KB Output is correct
25 Correct 124 ms 47316 KB Output is correct
26 Correct 110 ms 47424 KB Output is correct
27 Correct 111 ms 47292 KB Output is correct
28 Correct 140 ms 47392 KB Output is correct
29 Correct 130 ms 47348 KB Output is correct
30 Correct 130 ms 47428 KB Output is correct
31 Correct 130 ms 47264 KB Output is correct

Subtask #6
23.0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 248 ms 43308 KB Output is correct
4 Correct 221 ms 43076 KB Output is correct
5 Correct 274 ms 43308 KB Output is correct

Subtask #7
26.0 / 26.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 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 0 ms 348 KB Output is correct
10 Correct 0 ms 596 KB Output is correct
11 Correct 0 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 0 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 1368 KB Output is correct
19 Correct 2 ms 1372 KB Output is correct
20 Correct 2 ms 1368 KB Output is correct
21 Correct 2 ms 1372 KB Output is correct
22 Correct 3 ms 1372 KB Output is correct
23 Correct 2 ms 1372 KB Output is correct
24 Correct 2 ms 1372 KB Output is correct
25 Correct 0 ms 348 KB Output is correct
26 Correct 3 ms 1372 KB Output is correct
27 Correct 2 ms 1372 KB Output is correct
28 Correct 3 ms 1372 KB Output is correct
29 Correct 3 ms 1372 KB Output is correct
30 Correct 3 ms 1372 KB Output is correct
31 Correct 3 ms 1624 KB Output is correct
32 Correct 3 ms 1372 KB Output is correct
33 Correct 3 ms 1232 KB Output is correct
34 Correct 124 ms 47316 KB Output is correct
35 Correct 110 ms 47424 KB Output is correct
36 Correct 111 ms 47292 KB Output is correct
37 Correct 140 ms 47392 KB Output is correct
38 Correct 130 ms 47348 KB Output is correct
39 Correct 130 ms 47428 KB Output is correct
40 Correct 130 ms 47264 KB Output is correct
41 Correct 1 ms 348 KB Output is correct
42 Correct 0 ms 348 KB Output is correct
43 Correct 248 ms 43308 KB Output is correct
44 Correct 221 ms 43076 KB Output is correct
45 Correct 274 ms 43308 KB Output is correct
46 Correct 282 ms 47548 KB Output is correct
47 Correct 304 ms 46916 KB Output is correct
48 Correct 251 ms 48024 KB Output is correct
49 Correct 272 ms 46912 KB Output is correct
50 Correct 332 ms 43772 KB Output is correct
51 Correct 281 ms 43300 KB Output is correct
52 Correct 284 ms 43328 KB Output is correct
53 Correct 313 ms 43356 KB Output is correct