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답안 #386439

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
386439 2021-04-06T14:25:12 Z nafis_shifat Mergers (JOI19_mergers) C++14
100 / 100
 1509 ms 154732 KB 
#include<bits/stdc++.h>
#define ll long long
#define pii pair<int,int>
using namespace std;
const int mxn=5e5+5;
const int inf=1e9;
vector<int> v;
vector<int> adj[mxn];

int S[mxn];
vector<int> con[mxn];
int level[mxn];
int dp[mxn][20];

struct DSU {
    int parent[mxn];
    void init() {
        for(int i = 1; i < mxn; i++) parent[i] = i;
    }
    int findrep(int u) {
        return parent[u] == u ? u : parent[u] = findrep(parent[u]);
    }
    void unite(int u,int v) {
        u = findrep(u);
        v = findrep(v);
        if(u == v) return;
        if(level[u] < level[v]) swap(u,v);
        parent[u] = v;
    }

} dsu1,dsu2;


bool dfs(int cur,int prev,int src) {
    if(cur == src) return true;


    bool f = false;

    for(int u : adj[cur]) {
        if(u == prev) continue;
        f |= dfs(u,cur,src);
    }
    if(f) v.push_back(cur);
    return f;
}

void DFS(int cur,int prev) {
    level[cur] = level[prev] + 1;
    dp[cur][0] = prev;
    for(int i = 1; i < 20; i++) dp[cur][i] = dp[dp[cur][i - 1]][i - 1];
    for(int u : adj[cur]) {
        if(u != prev) {
            DFS(u,cur);
            if(S[u] == S[cur]) dsu1.unite(u,cur);
        }
    }
}

int findLCA(int u,int v){
    if(level[u] < level[v])swap(u,v);
    int diff = level[u] - level[v];
    for(int i = 0; i < 20; i++) if((diff>>i) & 1) u = dp[u][i];
    if(u == v) return u;
    for(int i = 19; i >= 0; i--) {
        if(dp[u][i] != dp[v][i]) {
            u = dp[u][i];
            v = dp[v][i];
        }
    }
    return dp[u][0];
}

void process(int u,int lv) {
    int cu = dsu1.findrep(u);
    int clv = level[cu];
    while(clv > lv) {
        int ccu = dsu1.findrep(dp[cu][0]);
        dsu1.unite(cu,ccu);
        dsu2.unite(S[cu],S[ccu]);
        cu = ccu;
        clv = level[cu];
    }
}


int main() {
    int n,k;
    cin >> n >> k;

    for(int i = 1; i < n; i++) {
        int u,v;
        cin >> u >> v;

        adj[u].push_back(v);
        adj[v].push_back(u);

    }

    for(int i = 1; i <= n; i++) {
        cin >> S[i];
        con[S[i]].push_back(i);
    }

    DFS(1,0);

    dsu1.init();
    dsu2.init();

    for(int i = 1; i <= k; i++) {
        sort(con[i].begin(),con[i].end(),[](int a,int b) {
            return level[a] < level[b];
        });
        for(int j = 1; j < con[i].size(); j++) {
            v.clear();
            int u = con[i][j];
            int v = con[i][j - 1];
            int lca = findLCA(u,v);

            process(u,level[lca]);
            process(v,level[lca]);
        }
    }
    int deg[k + 1] = {};

    for(int i = 1; i <= n; i++) {
        int x = dsu2.findrep(S[i]);
        for(int u : adj[i]) {
            if(x == dsu2.findrep(S[u])) continue;
            deg[dsu2.findrep(S[u])]++;
        }
    }

    int leaf = 0;
    for(int i = 1; i <= k; i++) {
        if(dsu2.parent[i] == i && deg[i] == 1) leaf++;
    }
    cout<<(leaf + 1) / 2<<endl;




}

Compilation message

mergers.cpp: In function 'int main()':
mergers.cpp:114:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  114 |         for(int j = 1; j < con[i].size(); j++) {
      |                        ~~^~~~~~~~~~~~~~~

Subtask #1
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 19 ms 27756 KB Output is correct
2 Correct 18 ms 27756 KB Output is correct
3 Correct 18 ms 27756 KB Output is correct
4 Correct 20 ms 27756 KB Output is correct
5 Correct 18 ms 27756 KB Output is correct
6 Correct 18 ms 27756 KB Output is correct
7 Correct 22 ms 27756 KB Output is correct
8 Correct 18 ms 27884 KB Output is correct
9 Correct 18 ms 27756 KB Output is correct
10 Correct 18 ms 27756 KB Output is correct
11 Correct 18 ms 27756 KB Output is correct
12 Correct 18 ms 27756 KB Output is correct
13 Correct 18 ms 27756 KB Output is correct
14 Correct 18 ms 27756 KB Output is correct
15 Correct 18 ms 27884 KB Output is correct
16 Correct 19 ms 27756 KB Output is correct
17 Correct 18 ms 27756 KB Output is correct
18 Correct 18 ms 27756 KB Output is correct
19 Correct 18 ms 27756 KB Output is correct
20 Correct 18 ms 27756 KB Output is correct
21 Correct 19 ms 27756 KB Output is correct
22 Correct 18 ms 27756 KB Output is correct
23 Correct 19 ms 27756 KB Output is correct
24 Correct 19 ms 27756 KB Output is correct

Subtask #2
24.0 / 24.0

# 결과 실행 시간 메모리 Grader output
1 Correct 19 ms 27756 KB Output is correct
2 Correct 18 ms 27756 KB Output is correct
3 Correct 18 ms 27756 KB Output is correct
4 Correct 20 ms 27756 KB Output is correct
5 Correct 18 ms 27756 KB Output is correct
6 Correct 18 ms 27756 KB Output is correct
7 Correct 22 ms 27756 KB Output is correct
8 Correct 18 ms 27884 KB Output is correct
9 Correct 18 ms 27756 KB Output is correct
10 Correct 18 ms 27756 KB Output is correct
11 Correct 18 ms 27756 KB Output is correct
12 Correct 18 ms 27756 KB Output is correct
13 Correct 18 ms 27756 KB Output is correct
14 Correct 18 ms 27756 KB Output is correct
15 Correct 18 ms 27884 KB Output is correct
16 Correct 19 ms 27756 KB Output is correct
17 Correct 18 ms 27756 KB Output is correct
18 Correct 18 ms 27756 KB Output is correct
19 Correct 18 ms 27756 KB Output is correct
20 Correct 18 ms 27756 KB Output is correct
21 Correct 19 ms 27756 KB Output is correct
22 Correct 18 ms 27756 KB Output is correct
23 Correct 19 ms 27756 KB Output is correct
24 Correct 19 ms 27756 KB Output is correct
25 Correct 18 ms 27756 KB Output is correct
26 Correct 22 ms 28140 KB Output is correct
27 Correct 21 ms 28160 KB Output is correct
28 Correct 22 ms 28396 KB Output is correct
29 Correct 23 ms 28268 KB Output is correct
30 Correct 22 ms 28140 KB Output is correct
31 Correct 18 ms 27756 KB Output is correct
32 Correct 22 ms 28524 KB Output is correct
33 Correct 19 ms 27756 KB Output is correct
34 Correct 21 ms 28140 KB Output is correct
35 Correct 22 ms 28268 KB Output is correct
36 Correct 22 ms 28140 KB Output is correct
37 Correct 22 ms 28140 KB Output is correct
38 Correct 18 ms 27756 KB Output is correct
39 Correct 22 ms 28140 KB Output is correct
40 Correct 22 ms 28140 KB Output is correct
41 Correct 22 ms 28140 KB Output is correct
42 Correct 21 ms 28140 KB Output is correct
43 Correct 22 ms 28524 KB Output is correct
44 Correct 18 ms 27756 KB Output is correct
45 Correct 24 ms 28284 KB Output is correct
46 Correct 22 ms 28140 KB Output is correct
47 Correct 19 ms 27756 KB Output is correct
48 Correct 22 ms 28140 KB Output is correct
49 Correct 22 ms 28268 KB Output is correct
50 Correct 23 ms 28268 KB Output is correct
51 Correct 22 ms 28140 KB Output is correct
52 Correct 21 ms 28140 KB Output is correct
53 Correct 21 ms 28140 KB Output is correct
54 Correct 21 ms 28140 KB Output is correct

Subtask #3
14.0 / 14.0

# 결과 실행 시간 메모리 Grader output
1 Correct 19 ms 27756 KB Output is correct
2 Correct 18 ms 27756 KB Output is correct
3 Correct 18 ms 27756 KB Output is correct
4 Correct 20 ms 27756 KB Output is correct
5 Correct 18 ms 27756 KB Output is correct
6 Correct 18 ms 27756 KB Output is correct
7 Correct 22 ms 27756 KB Output is correct
8 Correct 18 ms 27884 KB Output is correct
9 Correct 18 ms 27756 KB Output is correct
10 Correct 18 ms 27756 KB Output is correct
11 Correct 18 ms 27756 KB Output is correct
12 Correct 18 ms 27756 KB Output is correct
13 Correct 18 ms 27756 KB Output is correct
14 Correct 18 ms 27756 KB Output is correct
15 Correct 18 ms 27884 KB Output is correct
16 Correct 19 ms 27756 KB Output is correct
17 Correct 18 ms 27756 KB Output is correct
18 Correct 18 ms 27756 KB Output is correct
19 Correct 18 ms 27756 KB Output is correct
20 Correct 18 ms 27756 KB Output is correct
21 Correct 19 ms 27756 KB Output is correct
22 Correct 18 ms 27756 KB Output is correct
23 Correct 19 ms 27756 KB Output is correct
24 Correct 19 ms 27756 KB Output is correct
25 Correct 18 ms 27756 KB Output is correct
26 Correct 171 ms 41828 KB Output is correct
27 Correct 195 ms 41708 KB Output is correct
28 Correct 21 ms 28140 KB Output is correct
29 Correct 18 ms 27756 KB Output is correct
30 Correct 20 ms 27756 KB Output is correct
31 Correct 186 ms 41580 KB Output is correct
32 Correct 21 ms 28140 KB Output is correct
33 Correct 241 ms 54508 KB Output is correct
34 Correct 193 ms 41644 KB Output is correct
35 Correct 22 ms 28140 KB Output is correct
36 Correct 203 ms 42988 KB Output is correct
37 Correct 22 ms 28140 KB Output is correct
38 Correct 22 ms 28140 KB Output is correct
39 Correct 160 ms 41828 KB Output is correct
40 Correct 22 ms 28524 KB Output is correct
41 Correct 192 ms 41576 KB Output is correct
42 Correct 249 ms 46060 KB Output is correct
43 Correct 18 ms 27756 KB Output is correct
44 Correct 221 ms 55020 KB Output is correct
45 Correct 233 ms 48492 KB Output is correct
46 Correct 21 ms 28140 KB Output is correct
47 Correct 22 ms 28140 KB Output is correct

Subtask #4
22.0 / 22.0

# 결과 실행 시간 메모리 Grader output
1 Correct 155 ms 40420 KB Output is correct
2 Correct 165 ms 43492 KB Output is correct
3 Correct 22 ms 28140 KB Output is correct
4 Correct 21 ms 28140 KB Output is correct
5 Correct 18 ms 27756 KB Output is correct
6 Correct 18 ms 27756 KB Output is correct
7 Correct 21 ms 28140 KB Output is correct
8 Correct 222 ms 43380 KB Output is correct
9 Correct 22 ms 28140 KB Output is correct
10 Correct 193 ms 41708 KB Output is correct
11 Correct 18 ms 27756 KB Output is correct
12 Correct 204 ms 41872 KB Output is correct
13 Correct 212 ms 43116 KB Output is correct
14 Correct 201 ms 44908 KB Output is correct
15 Correct 163 ms 41956 KB Output is correct
16 Correct 22 ms 28140 KB Output is correct
17 Correct 18 ms 27756 KB Output is correct
18 Correct 169 ms 44772 KB Output is correct
19 Correct 227 ms 51564 KB Output is correct
20 Correct 22 ms 28140 KB Output is correct
21 Correct 19 ms 27756 KB Output is correct
22 Correct 171 ms 43368 KB Output is correct
23 Correct 22 ms 28140 KB Output is correct
24 Correct 205 ms 42092 KB Output is correct
25 Correct 212 ms 49132 KB Output is correct
26 Correct 21 ms 28268 KB Output is correct
27 Correct 22 ms 28268 KB Output is correct
28 Correct 22 ms 28140 KB Output is correct
29 Correct 22 ms 28140 KB Output is correct
30 Correct 22 ms 28140 KB Output is correct

Subtask #5
30.0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 19 ms 27756 KB Output is correct
2 Correct 18 ms 27756 KB Output is correct
3 Correct 18 ms 27756 KB Output is correct
4 Correct 20 ms 27756 KB Output is correct
5 Correct 18 ms 27756 KB Output is correct
6 Correct 18 ms 27756 KB Output is correct
7 Correct 22 ms 27756 KB Output is correct
8 Correct 18 ms 27884 KB Output is correct
9 Correct 18 ms 27756 KB Output is correct
10 Correct 18 ms 27756 KB Output is correct
11 Correct 18 ms 27756 KB Output is correct
12 Correct 18 ms 27756 KB Output is correct
13 Correct 18 ms 27756 KB Output is correct
14 Correct 18 ms 27756 KB Output is correct
15 Correct 18 ms 27884 KB Output is correct
16 Correct 19 ms 27756 KB Output is correct
17 Correct 18 ms 27756 KB Output is correct
18 Correct 18 ms 27756 KB Output is correct
19 Correct 18 ms 27756 KB Output is correct
20 Correct 18 ms 27756 KB Output is correct
21 Correct 19 ms 27756 KB Output is correct
22 Correct 18 ms 27756 KB Output is correct
23 Correct 19 ms 27756 KB Output is correct
24 Correct 19 ms 27756 KB Output is correct
25 Correct 18 ms 27756 KB Output is correct
26 Correct 22 ms 28140 KB Output is correct
27 Correct 21 ms 28160 KB Output is correct
28 Correct 22 ms 28396 KB Output is correct
29 Correct 23 ms 28268 KB Output is correct
30 Correct 22 ms 28140 KB Output is correct
31 Correct 18 ms 27756 KB Output is correct
32 Correct 22 ms 28524 KB Output is correct
33 Correct 19 ms 27756 KB Output is correct
34 Correct 21 ms 28140 KB Output is correct
35 Correct 22 ms 28268 KB Output is correct
36 Correct 22 ms 28140 KB Output is correct
37 Correct 22 ms 28140 KB Output is correct
38 Correct 18 ms 27756 KB Output is correct
39 Correct 22 ms 28140 KB Output is correct
40 Correct 22 ms 28140 KB Output is correct
41 Correct 22 ms 28140 KB Output is correct
42 Correct 21 ms 28140 KB Output is correct
43 Correct 22 ms 28524 KB Output is correct
44 Correct 18 ms 27756 KB Output is correct
45 Correct 24 ms 28284 KB Output is correct
46 Correct 22 ms 28140 KB Output is correct
47 Correct 19 ms 27756 KB Output is correct
48 Correct 22 ms 28140 KB Output is correct
49 Correct 22 ms 28268 KB Output is correct
50 Correct 23 ms 28268 KB Output is correct
51 Correct 22 ms 28140 KB Output is correct
52 Correct 21 ms 28140 KB Output is correct
53 Correct 21 ms 28140 KB Output is correct
54 Correct 21 ms 28140 KB Output is correct
55 Correct 18 ms 27756 KB Output is correct
56 Correct 171 ms 41828 KB Output is correct
57 Correct 195 ms 41708 KB Output is correct
58 Correct 21 ms 28140 KB Output is correct
59 Correct 18 ms 27756 KB Output is correct
60 Correct 20 ms 27756 KB Output is correct
61 Correct 186 ms 41580 KB Output is correct
62 Correct 21 ms 28140 KB Output is correct
63 Correct 241 ms 54508 KB Output is correct
64 Correct 193 ms 41644 KB Output is correct
65 Correct 22 ms 28140 KB Output is correct
66 Correct 203 ms 42988 KB Output is correct
67 Correct 22 ms 28140 KB Output is correct
68 Correct 22 ms 28140 KB Output is correct
69 Correct 160 ms 41828 KB Output is correct
70 Correct 22 ms 28524 KB Output is correct
71 Correct 192 ms 41576 KB Output is correct
72 Correct 249 ms 46060 KB Output is correct
73 Correct 18 ms 27756 KB Output is correct
74 Correct 221 ms 55020 KB Output is correct
75 Correct 233 ms 48492 KB Output is correct
76 Correct 21 ms 28140 KB Output is correct
77 Correct 22 ms 28140 KB Output is correct
78 Correct 155 ms 40420 KB Output is correct
79 Correct 165 ms 43492 KB Output is correct
80 Correct 22 ms 28140 KB Output is correct
81 Correct 21 ms 28140 KB Output is correct
82 Correct 18 ms 27756 KB Output is correct
83 Correct 18 ms 27756 KB Output is correct
84 Correct 21 ms 28140 KB Output is correct
85 Correct 222 ms 43380 KB Output is correct
86 Correct 22 ms 28140 KB Output is correct
87 Correct 193 ms 41708 KB Output is correct
88 Correct 18 ms 27756 KB Output is correct
89 Correct 204 ms 41872 KB Output is correct
90 Correct 212 ms 43116 KB Output is correct
91 Correct 201 ms 44908 KB Output is correct
92 Correct 163 ms 41956 KB Output is correct
93 Correct 22 ms 28140 KB Output is correct
94 Correct 18 ms 27756 KB Output is correct
95 Correct 169 ms 44772 KB Output is correct
96 Correct 227 ms 51564 KB Output is correct
97 Correct 22 ms 28140 KB Output is correct
98 Correct 19 ms 27756 KB Output is correct
99 Correct 171 ms 43368 KB Output is correct
100 Correct 22 ms 28140 KB Output is correct
101 Correct 205 ms 42092 KB Output is correct
102 Correct 212 ms 49132 KB Output is correct
103 Correct 21 ms 28268 KB Output is correct
104 Correct 22 ms 28268 KB Output is correct
105 Correct 22 ms 28140 KB Output is correct
106 Correct 22 ms 28140 KB Output is correct
107 Correct 22 ms 28140 KB Output is correct
108 Correct 1102 ms 105680 KB Output is correct
109 Correct 1405 ms 129728 KB Output is correct
110 Correct 1426 ms 150108 KB Output is correct
111 Correct 1475 ms 154732 KB Output is correct
112 Correct 1501 ms 137008 KB Output is correct
113 Correct 1018 ms 114260 KB Output is correct
114 Correct 1147 ms 96728 KB Output is correct
115 Correct 1151 ms 96868 KB Output is correct
116 Correct 1483 ms 101808 KB Output is correct
117 Correct 1292 ms 114592 KB Output is correct
118 Correct 1220 ms 97448 KB Output is correct
119 Correct 1296 ms 114576 KB Output is correct
120 Correct 1448 ms 138336 KB Output is correct
121 Correct 1293 ms 114656 KB Output is correct
122 Correct 1509 ms 107560 KB Output is correct
123 Correct 978 ms 116188 KB Output is correct
124 Correct 1363 ms 112368 KB Output is correct