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답안 #817772

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
817772 2023-08-09T16:06:19 Z LucaIlie Mergers (JOI19_mergers) C++17
100 / 100
 1583 ms 211776 KB 
#include <bits/stdc++.h>

using namespace std;

const int MAX_N = 5e5;
const int MAX_LOG_N = 19;
int state[MAX_N + 1], parent[MAX_LOG_N + 1][MAX_N + 1], depth[MAX_N + 1], updates[MAX_N + 1];
vector<int> edges[MAX_N + 1], cities[MAX_N + 1];
set<int> stateEdges[MAX_N + 1];

struct DSU {
    int p[MAX_N + 1];

    void init( int k ) {
        for ( int u = 1; u <= k; u++ )
            p[u] = u;
    }

    int find( int u ) {
        if ( p[u] == u )
            return u;
        p[u] = find( p[u] );
        return p[u];
    }

    void merge( int u, int v ) {
        u = find( u );
        v = find( v );
        if ( u == v )
            return;

        p[u] = v;
    }
} dsu;

void dfs( int u, int p ) {
    depth[u] = depth[p] + 1;
    parent[0][u] = p;
    for ( int v: edges[u] ) {
        if ( v == p )
            continue;
        dfs( v, u );
    }
}

void init() {
    for ( int p = 1; p <= MAX_LOG_N; p++ ) {
        for ( int u = 0; u <= MAX_N; u++ )
            parent[p][u] = parent[p - 1][parent[p - 1][u]];
    }
}

int lca( int u, int v ) {
    if ( depth[u] > depth[v] )
        swap( u, v );

    for ( int p = MAX_LOG_N; p >= 0; p-- ) {
        if ( depth[parent[p][v]] >= depth[u] )
            v = parent[p][v];
    }

    if ( u == v )
        return u;

    for ( int p = MAX_LOG_N; p >= 0; p-- ) {
        if ( parent[p][u] != parent[p][v] ) {
            u = parent[p][u];
            v = parent[p][v];
        }
    }

    return parent[0][u];
}

void dfsMerge( int u, int p ) {
    for ( int v: edges[u] ) {
        if ( v == p )
            continue;
        dfsMerge( v, u );
        updates[u] += updates[v];
    }

    if ( updates[u] > 0 )
        dsu.merge( state[u], state[parent[0][u]] );
}

int main() {
    int n, k;

    cin >> n >> k;
    for ( int i = 0; i < n - 1; i++ ) {
        int u, v;
        cin >> u >> v;
        edges[u].push_back( v );
        edges[v].push_back( u );
    }
    for ( int u = 1; u <= n; u++ ) {
        cin >> state[u];
        cities[state[u]].push_back( u );
    }

    dfs( 1, 0 );

    init();
    for ( int s = 1; s <= k; s++ ) {
        for ( int i = 0; i < cities[s].size() - 1; i++ ) {
            int u = cities[s][i], v = cities[s][i + 1];
            int l = lca( u, v );
            updates[u]++;
            updates[v]++;
            updates[l] -= 2;
        }
    }

    dsu.init( k );
    dfsMerge( 1, 0 );
    for ( int u = 1; u <= n; u++ )
        state[u] = dsu.find( state[u] );

    for ( int u = 1; u <= n; u++ ) {
        for ( int v: edges[u] ) {
            if ( state[u] == state[v] )
                continue;
            stateEdges[state[u]].insert( state[v] );
            stateEdges[state[v]].insert( state[u] );
        }
    }

    int leafs = 0;
    for ( int s = 1; s <= k; s++ ) {
        if ( stateEdges[s].size() == 1 )
            leafs++;
    }

    cout << (leafs + 1) / 2;

    return 0;
}

Compilation message

mergers.cpp: In function 'int main()':
mergers.cpp:106:28: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  106 |         for ( int i = 0; i < cities[s].size() - 1; i++ ) {
      |                          ~~^~~~~~~~~~~~~~~~~~~~~~

Subtask #1
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 42 ms 84384 KB Output is correct
2 Correct 43 ms 84368 KB Output is correct
3 Correct 41 ms 84396 KB Output is correct
4 Correct 42 ms 84436 KB Output is correct
5 Correct 42 ms 84392 KB Output is correct
6 Correct 42 ms 84444 KB Output is correct
7 Correct 40 ms 84436 KB Output is correct
8 Correct 42 ms 84436 KB Output is correct
9 Correct 41 ms 84384 KB Output is correct
10 Correct 41 ms 84428 KB Output is correct
11 Correct 42 ms 84484 KB Output is correct
12 Correct 42 ms 84428 KB Output is correct
13 Correct 43 ms 84436 KB Output is correct
14 Correct 42 ms 84356 KB Output is correct
15 Correct 43 ms 84408 KB Output is correct
16 Correct 50 ms 84472 KB Output is correct
17 Correct 47 ms 84380 KB Output is correct
18 Correct 41 ms 84480 KB Output is correct
19 Correct 41 ms 84436 KB Output is correct
20 Correct 42 ms 84428 KB Output is correct
21 Correct 44 ms 84416 KB Output is correct
22 Correct 42 ms 84480 KB Output is correct
23 Correct 50 ms 84472 KB Output is correct
24 Correct 53 ms 84448 KB Output is correct

Subtask #2
24.0 / 24.0

# 결과 실행 시간 메모리 Grader output
1 Correct 42 ms 84384 KB Output is correct
2 Correct 43 ms 84368 KB Output is correct
3 Correct 41 ms 84396 KB Output is correct
4 Correct 42 ms 84436 KB Output is correct
5 Correct 42 ms 84392 KB Output is correct
6 Correct 42 ms 84444 KB Output is correct
7 Correct 40 ms 84436 KB Output is correct
8 Correct 42 ms 84436 KB Output is correct
9 Correct 41 ms 84384 KB Output is correct
10 Correct 41 ms 84428 KB Output is correct
11 Correct 42 ms 84484 KB Output is correct
12 Correct 42 ms 84428 KB Output is correct
13 Correct 43 ms 84436 KB Output is correct
14 Correct 42 ms 84356 KB Output is correct
15 Correct 43 ms 84408 KB Output is correct
16 Correct 50 ms 84472 KB Output is correct
17 Correct 47 ms 84380 KB Output is correct
18 Correct 41 ms 84480 KB Output is correct
19 Correct 41 ms 84436 KB Output is correct
20 Correct 42 ms 84428 KB Output is correct
21 Correct 44 ms 84416 KB Output is correct
22 Correct 42 ms 84480 KB Output is correct
23 Correct 50 ms 84472 KB Output is correct
24 Correct 53 ms 84448 KB Output is correct
25 Correct 41 ms 84472 KB Output is correct
26 Correct 45 ms 84812 KB Output is correct
27 Correct 45 ms 84684 KB Output is correct
28 Correct 45 ms 85036 KB Output is correct
29 Correct 45 ms 84944 KB Output is correct
30 Correct 45 ms 84692 KB Output is correct
31 Correct 42 ms 84476 KB Output is correct
32 Correct 46 ms 85040 KB Output is correct
33 Correct 41 ms 84364 KB Output is correct
34 Correct 45 ms 84688 KB Output is correct
35 Correct 47 ms 84948 KB Output is correct
36 Correct 44 ms 84552 KB Output is correct
37 Correct 45 ms 84648 KB Output is correct
38 Correct 43 ms 84480 KB Output is correct
39 Correct 45 ms 84668 KB Output is correct
40 Correct 45 ms 84616 KB Output is correct
41 Correct 44 ms 84648 KB Output is correct
42 Correct 45 ms 84740 KB Output is correct
43 Correct 46 ms 84872 KB Output is correct
44 Correct 42 ms 84452 KB Output is correct
45 Correct 43 ms 84740 KB Output is correct
46 Correct 45 ms 84636 KB Output is correct
47 Correct 43 ms 84468 KB Output is correct
48 Correct 44 ms 84620 KB Output is correct
49 Correct 45 ms 84936 KB Output is correct
50 Correct 44 ms 85032 KB Output is correct
51 Correct 46 ms 84616 KB Output is correct
52 Correct 44 ms 84600 KB Output is correct
53 Correct 44 ms 84684 KB Output is correct
54 Correct 45 ms 84620 KB Output is correct

Subtask #3
14.0 / 14.0

# 결과 실행 시간 메모리 Grader output
1 Correct 42 ms 84384 KB Output is correct
2 Correct 43 ms 84368 KB Output is correct
3 Correct 41 ms 84396 KB Output is correct
4 Correct 42 ms 84436 KB Output is correct
5 Correct 42 ms 84392 KB Output is correct
6 Correct 42 ms 84444 KB Output is correct
7 Correct 40 ms 84436 KB Output is correct
8 Correct 42 ms 84436 KB Output is correct
9 Correct 41 ms 84384 KB Output is correct
10 Correct 41 ms 84428 KB Output is correct
11 Correct 42 ms 84484 KB Output is correct
12 Correct 42 ms 84428 KB Output is correct
13 Correct 43 ms 84436 KB Output is correct
14 Correct 42 ms 84356 KB Output is correct
15 Correct 43 ms 84408 KB Output is correct
16 Correct 50 ms 84472 KB Output is correct
17 Correct 47 ms 84380 KB Output is correct
18 Correct 41 ms 84480 KB Output is correct
19 Correct 41 ms 84436 KB Output is correct
20 Correct 42 ms 84428 KB Output is correct
21 Correct 44 ms 84416 KB Output is correct
22 Correct 42 ms 84480 KB Output is correct
23 Correct 50 ms 84472 KB Output is correct
24 Correct 53 ms 84448 KB Output is correct
25 Correct 49 ms 84428 KB Output is correct
26 Correct 136 ms 90568 KB Output is correct
27 Correct 161 ms 90236 KB Output is correct
28 Correct 44 ms 84612 KB Output is correct
29 Correct 41 ms 84464 KB Output is correct
30 Correct 42 ms 84428 KB Output is correct
31 Correct 158 ms 90180 KB Output is correct
32 Correct 44 ms 84584 KB Output is correct
33 Correct 179 ms 100400 KB Output is correct
34 Correct 158 ms 91156 KB Output is correct
35 Correct 44 ms 84556 KB Output is correct
36 Correct 164 ms 92236 KB Output is correct
37 Correct 45 ms 84668 KB Output is correct
38 Correct 54 ms 84572 KB Output is correct
39 Correct 141 ms 91440 KB Output is correct
40 Correct 45 ms 84992 KB Output is correct
41 Correct 149 ms 91040 KB Output is correct
42 Correct 193 ms 94520 KB Output is correct
43 Correct 42 ms 84464 KB Output is correct
44 Correct 165 ms 101568 KB Output is correct
45 Correct 179 ms 96400 KB Output is correct
46 Correct 45 ms 84688 KB Output is correct
47 Correct 45 ms 84584 KB Output is correct

Subtask #4
22.0 / 22.0

# 결과 실행 시간 메모리 Grader output
1 Correct 144 ms 91136 KB Output is correct
2 Correct 199 ms 103052 KB Output is correct
3 Correct 45 ms 84788 KB Output is correct
4 Correct 44 ms 84684 KB Output is correct
5 Correct 43 ms 84364 KB Output is correct
6 Correct 41 ms 84428 KB Output is correct
7 Correct 47 ms 84852 KB Output is correct
8 Correct 177 ms 92488 KB Output is correct
9 Correct 44 ms 84692 KB Output is correct
10 Correct 162 ms 90368 KB Output is correct
11 Correct 43 ms 84376 KB Output is correct
12 Correct 166 ms 90492 KB Output is correct
13 Correct 178 ms 93272 KB Output is correct
14 Correct 189 ms 102588 KB Output is correct
15 Correct 136 ms 90556 KB Output is correct
16 Correct 46 ms 84744 KB Output is correct
17 Correct 42 ms 84428 KB Output is correct
18 Correct 190 ms 100804 KB Output is correct
19 Correct 189 ms 108112 KB Output is correct
20 Correct 46 ms 84672 KB Output is correct
21 Correct 42 ms 84400 KB Output is correct
22 Correct 179 ms 93544 KB Output is correct
23 Correct 44 ms 84708 KB Output is correct
24 Correct 170 ms 91468 KB Output is correct
25 Correct 183 ms 106352 KB Output is correct
26 Correct 45 ms 85032 KB Output is correct
27 Correct 46 ms 85088 KB Output is correct
28 Correct 46 ms 84628 KB Output is correct
29 Correct 45 ms 84576 KB Output is correct
30 Correct 46 ms 84668 KB Output is correct

Subtask #5
30.0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 42 ms 84384 KB Output is correct
2 Correct 43 ms 84368 KB Output is correct
3 Correct 41 ms 84396 KB Output is correct
4 Correct 42 ms 84436 KB Output is correct
5 Correct 42 ms 84392 KB Output is correct
6 Correct 42 ms 84444 KB Output is correct
7 Correct 40 ms 84436 KB Output is correct
8 Correct 42 ms 84436 KB Output is correct
9 Correct 41 ms 84384 KB Output is correct
10 Correct 41 ms 84428 KB Output is correct
11 Correct 42 ms 84484 KB Output is correct
12 Correct 42 ms 84428 KB Output is correct
13 Correct 43 ms 84436 KB Output is correct
14 Correct 42 ms 84356 KB Output is correct
15 Correct 43 ms 84408 KB Output is correct
16 Correct 50 ms 84472 KB Output is correct
17 Correct 47 ms 84380 KB Output is correct
18 Correct 41 ms 84480 KB Output is correct
19 Correct 41 ms 84436 KB Output is correct
20 Correct 42 ms 84428 KB Output is correct
21 Correct 44 ms 84416 KB Output is correct
22 Correct 42 ms 84480 KB Output is correct
23 Correct 50 ms 84472 KB Output is correct
24 Correct 53 ms 84448 KB Output is correct
25 Correct 41 ms 84472 KB Output is correct
26 Correct 45 ms 84812 KB Output is correct
27 Correct 45 ms 84684 KB Output is correct
28 Correct 45 ms 85036 KB Output is correct
29 Correct 45 ms 84944 KB Output is correct
30 Correct 45 ms 84692 KB Output is correct
31 Correct 42 ms 84476 KB Output is correct
32 Correct 46 ms 85040 KB Output is correct
33 Correct 41 ms 84364 KB Output is correct
34 Correct 45 ms 84688 KB Output is correct
35 Correct 47 ms 84948 KB Output is correct
36 Correct 44 ms 84552 KB Output is correct
37 Correct 45 ms 84648 KB Output is correct
38 Correct 43 ms 84480 KB Output is correct
39 Correct 45 ms 84668 KB Output is correct
40 Correct 45 ms 84616 KB Output is correct
41 Correct 44 ms 84648 KB Output is correct
42 Correct 45 ms 84740 KB Output is correct
43 Correct 46 ms 84872 KB Output is correct
44 Correct 42 ms 84452 KB Output is correct
45 Correct 43 ms 84740 KB Output is correct
46 Correct 45 ms 84636 KB Output is correct
47 Correct 43 ms 84468 KB Output is correct
48 Correct 44 ms 84620 KB Output is correct
49 Correct 45 ms 84936 KB Output is correct
50 Correct 44 ms 85032 KB Output is correct
51 Correct 46 ms 84616 KB Output is correct
52 Correct 44 ms 84600 KB Output is correct
53 Correct 44 ms 84684 KB Output is correct
54 Correct 45 ms 84620 KB Output is correct
55 Correct 49 ms 84428 KB Output is correct
56 Correct 136 ms 90568 KB Output is correct
57 Correct 161 ms 90236 KB Output is correct
58 Correct 44 ms 84612 KB Output is correct
59 Correct 41 ms 84464 KB Output is correct
60 Correct 42 ms 84428 KB Output is correct
61 Correct 158 ms 90180 KB Output is correct
62 Correct 44 ms 84584 KB Output is correct
63 Correct 179 ms 100400 KB Output is correct
64 Correct 158 ms 91156 KB Output is correct
65 Correct 44 ms 84556 KB Output is correct
66 Correct 164 ms 92236 KB Output is correct
67 Correct 45 ms 84668 KB Output is correct
68 Correct 54 ms 84572 KB Output is correct
69 Correct 141 ms 91440 KB Output is correct
70 Correct 45 ms 84992 KB Output is correct
71 Correct 149 ms 91040 KB Output is correct
72 Correct 193 ms 94520 KB Output is correct
73 Correct 42 ms 84464 KB Output is correct
74 Correct 165 ms 101568 KB Output is correct
75 Correct 179 ms 96400 KB Output is correct
76 Correct 45 ms 84688 KB Output is correct
77 Correct 45 ms 84584 KB Output is correct
78 Correct 144 ms 91136 KB Output is correct
79 Correct 199 ms 103052 KB Output is correct
80 Correct 45 ms 84788 KB Output is correct
81 Correct 44 ms 84684 KB Output is correct
82 Correct 43 ms 84364 KB Output is correct
83 Correct 41 ms 84428 KB Output is correct
84 Correct 47 ms 84852 KB Output is correct
85 Correct 177 ms 92488 KB Output is correct
86 Correct 44 ms 84692 KB Output is correct
87 Correct 162 ms 90368 KB Output is correct
88 Correct 43 ms 84376 KB Output is correct
89 Correct 166 ms 90492 KB Output is correct
90 Correct 178 ms 93272 KB Output is correct
91 Correct 189 ms 102588 KB Output is correct
92 Correct 136 ms 90556 KB Output is correct
93 Correct 46 ms 84744 KB Output is correct
94 Correct 42 ms 84428 KB Output is correct
95 Correct 190 ms 100804 KB Output is correct
96 Correct 189 ms 108112 KB Output is correct
97 Correct 46 ms 84672 KB Output is correct
98 Correct 42 ms 84400 KB Output is correct
99 Correct 179 ms 93544 KB Output is correct
100 Correct 44 ms 84708 KB Output is correct
101 Correct 170 ms 91468 KB Output is correct
102 Correct 183 ms 106352 KB Output is correct
103 Correct 45 ms 85032 KB Output is correct
104 Correct 46 ms 85088 KB Output is correct
105 Correct 46 ms 84628 KB Output is correct
106 Correct 45 ms 84576 KB Output is correct
107 Correct 46 ms 84668 KB Output is correct
108 Correct 1269 ms 131244 KB Output is correct
109 Correct 1512 ms 143464 KB Output is correct
110 Correct 1509 ms 159280 KB Output is correct
111 Correct 1277 ms 211776 KB Output is correct
112 Correct 1168 ms 179852 KB Output is correct
113 Correct 1308 ms 173588 KB Output is correct
114 Correct 917 ms 118128 KB Output is correct
115 Correct 878 ms 118068 KB Output is correct
116 Correct 1583 ms 123440 KB Output is correct
117 Correct 1112 ms 182968 KB Output is correct
118 Correct 1245 ms 119596 KB Output is correct
119 Correct 1106 ms 182992 KB Output is correct
120 Correct 1184 ms 202740 KB Output is correct
121 Correct 1082 ms 182836 KB Output is correct
122 Correct 1552 ms 137116 KB Output is correct
123 Correct 1461 ms 182624 KB Output is correct
124 Correct 1085 ms 165012 KB Output is correct