oj.uz

Submission #343112

# Submission time Handle Problem Language Result Execution time Memory
343112 2021-01-03T12:22:52 Z urd05 Village (BOI20_village) C++14
100 / 100
 215 ms 91492 KB 
#include <bits/stdc++.h>
using namespace std;

vector<int> adj[100000];
vector<int> son[100000];
int dp0[100000];
int dp1[100000];
int p[100000];
int group[100000];
int save[100000];
int nxt[100000];
int nxt2[100000];
int sz[100000];
typedef pair<int,int> P;

void dfs(int v,int prev) {
    p[v]=prev;
    sz[v]=1;
    for(int i=0;i<adj[v].size();i++) {
        int nt=adj[v][i];
        if (nt!=prev) {
            son[v].push_back(nt);
            dfs(nt,v);
            sz[v]+=sz[nt];
        }
    }
    for(int i=0;i<son[v].size();i++) {
        int nt=son[v][i];
        dp1[v]+=max(dp0[nt],dp1[nt]);
    }
    int mx=-1e6;
    dp0[v]=1;
    for(int i=0;i<son[v].size();i++) {
        int nt=son[v][i];
        mx=max(mx,dp1[nt]-dp0[nt]);
        dp0[v]+=max(dp0[nt],dp1[nt]);
    }
    if (mx<0) {
        dp0[v]+=mx;
    }
}

int n;
vector<int> v;

void dfs2(int v,int type) {
    if (type==0) {
        group[v]=v;
        save[v]=v;
        int pos=-1;
        int mx=-1e6;
        for(int i=0;i<son[v].size();i++) {
            int nt=son[v][i];
            if (dp1[nt]-dp0[nt]>mx) {
                mx=dp1[nt]-dp0[nt];
                pos=i;
            }
        }
        for(int i=0;i<son[v].size();i++) {
            int nt=son[v][i];
            if (dp1[nt]>dp0[nt]||pos==i) {
                dfs2(nt,1);
            }
            else {
                dfs2(nt,0);
            }
        }
    }
    else {
        group[v]=group[p[v]];
        nxt[v]=save[group[v]];
        save[group[v]]=v;
        for(int i=0;i<son[v].size();i++) {
            int nt=son[v][i];
            if (dp1[nt]>dp0[nt]) {
                dfs2(nt,1);
            }
            else {
                dfs2(nt,0);
            }
        }
    }
}

int getcent(int v,int prev,int half) {
    for(int i=0;i<adj[v].size();i++) {
        int nt=adj[v][i];
        if (nt==prev) {
            continue;
        }
        if (sz[nt]>half) {
            return getcent(nt,v,half);
        }
    }
    return v;
}

stack<int> s[100000];

void psh(int v,int type) {
    s[type].push(v);
    for(int i=0;i<son[v].size();i++) {
        psh(son[v][i],type);
    }
}

void dfs_sz(int v,int prev) {
    sz[v]=1;
    for(int i=0;i<adj[v].size();i++) {
        int nt=adj[v][i];
        if (nt==prev) {
            continue;
        }
        dfs_sz(nt,v);
        sz[v]+=sz[nt];
    }
}

int main(void) {
    memset(save,-1,sizeof(save));
    scanf("%d",&n);
    if (n==2) {
        printf("2 2\n2 1\n2 1");
        return 0;
    }
    for(int i=1;i<n;i++) {
        int u,v;
        scanf("%d %d",&u,&v);
        u--;
        v--;
        adj[u].push_back(v);
        adj[v].push_back(u);
    }
    dfs_sz(0,-1);
    int cent=getcent(0,-1,n/2);
    dfs(cent,-1);
    printf("%d ",2*n-2*dp0[cent]);
    long long ret=0;
    for(int i=0;i<n;i++) {
        if (i!=cent)
            ret+=min(sz[i],n-sz[i])*2;
    }
    printf("%lld\n",ret);
    priority_queue<P> pq;
    for(int i=0;i<son[cent].size();i++) {
        pq.push(P(sz[son[cent][i]],i));
        psh(son[cent][i],i);
    }
    v.push_back(cent);
    int prev=-1;
    for(int i=1;i<n;i++) {
        P now=pq.top();
        P sav=P(-1,-1);
        if (now.second==prev) {
            sav=now;
            pq.pop();
            now=pq.top();
        }
        v.push_back(s[now.second].top());
        s[now.second].pop();
        pq.pop();
        pq.push(P(now.first-1,now.second));
        if (sav.second!=-1) {
            pq.push(sav);
        }
        prev=now.second;
    }
    for(int i=0;i<n;i++) {
        nxt2[v[i]]=v[(i+1)%n];
    }
    dfs2(cent,0);
    for(int i=0;i<n;i++) {
        if (save[i]!=-1) {
            nxt[i]=save[i];
        }
    }
    for(int i=0;i<n;i++) {
        printf("%d ",nxt[i]+1);
    }
    printf("\n");
    for(int i=0;i<n;i++) {
        printf("%d ",nxt2[i]+1);
    }
}

Compilation message

Village.cpp: In function 'void dfs(int, int)':
Village.cpp:19:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   19 |     for(int i=0;i<adj[v].size();i++) {
      |                 ~^~~~~~~~~~~~~~
Village.cpp:27:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   27 |     for(int i=0;i<son[v].size();i++) {
      |                 ~^~~~~~~~~~~~~~
Village.cpp:33:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   33 |     for(int i=0;i<son[v].size();i++) {
      |                 ~^~~~~~~~~~~~~~
Village.cpp: In function 'void dfs2(int, int)':
Village.cpp:52:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   52 |         for(int i=0;i<son[v].size();i++) {
      |                     ~^~~~~~~~~~~~~~
Village.cpp:59:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   59 |         for(int i=0;i<son[v].size();i++) {
      |                     ~^~~~~~~~~~~~~~
Village.cpp:73:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   73 |         for(int i=0;i<son[v].size();i++) {
      |                     ~^~~~~~~~~~~~~~
Village.cpp: In function 'int getcent(int, int, int)':
Village.cpp:86:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   86 |     for(int i=0;i<adj[v].size();i++) {
      |                 ~^~~~~~~~~~~~~~
Village.cpp: In function 'void psh(int, int)':
Village.cpp:102:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  102 |     for(int i=0;i<son[v].size();i++) {
      |                 ~^~~~~~~~~~~~~~
Village.cpp: In function 'void dfs_sz(int, int)':
Village.cpp:109:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  109 |     for(int i=0;i<adj[v].size();i++) {
      |                 ~^~~~~~~~~~~~~~
Village.cpp: In function 'int main()':
Village.cpp:145:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  145 |     for(int i=0;i<son[cent].size();i++) {
      |                 ~^~~~~~~~~~~~~~~~~
Village.cpp:121:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  121 |     scanf("%d",&n);
      |     ~~~~~^~~~~~~~~
Village.cpp:128:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  128 |         scanf("%d %d",&u,&v);
      |         ~~~~~^~~~~~~~~~~~~~~

Subtask #1
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 52 ms 72812 KB Output is correct
2 Correct 65 ms 72812 KB Output is correct
3 Correct 50 ms 72684 KB Output is correct
4 Correct 57 ms 72812 KB Output is correct
5 Correct 57 ms 72812 KB Output is correct
6 Correct 50 ms 72812 KB Output is correct
7 Correct 52 ms 72812 KB Output is correct
8 Correct 50 ms 72812 KB Output is correct
9 Correct 53 ms 72812 KB Output is correct
10 Correct 53 ms 72812 KB Output is correct
11 Correct 51 ms 72812 KB Output is correct
12 Correct 51 ms 72832 KB Output is correct
13 Correct 61 ms 72812 KB Output is correct
14 Correct 56 ms 72812 KB Output is correct
15 Correct 52 ms 72812 KB Output is correct
16 Correct 53 ms 72812 KB Output is correct
17 Correct 58 ms 72812 KB Output is correct

Subtask #2
38.0 / 38.0

# Verdict Execution time Memory Grader output
1 Correct 57 ms 72812 KB Output is correct
2 Correct 55 ms 72812 KB Output is correct
3 Correct 54 ms 72812 KB Output is correct
4 Correct 59 ms 72812 KB Output is correct
5 Correct 60 ms 72812 KB Output is correct
6 Correct 58 ms 72812 KB Output is correct
7 Correct 52 ms 72940 KB Output is correct
8 Correct 60 ms 73004 KB Output is correct
9 Correct 55 ms 72812 KB Output is correct
10 Correct 54 ms 72812 KB Output is correct
11 Correct 55 ms 72812 KB Output is correct
12 Correct 59 ms 72812 KB Output is correct
13 Correct 56 ms 72812 KB Output is correct
14 Correct 58 ms 72812 KB Output is correct
15 Correct 57 ms 72812 KB Output is correct
16 Correct 58 ms 72812 KB Output is correct
17 Correct 56 ms 72812 KB Output is correct
18 Correct 54 ms 72812 KB Output is correct
19 Correct 65 ms 72812 KB Output is correct
20 Correct 56 ms 72928 KB Output is correct
21 Correct 57 ms 72812 KB Output is correct
22 Correct 54 ms 72812 KB Output is correct
23 Correct 55 ms 72832 KB Output is correct
24 Correct 55 ms 72812 KB Output is correct
25 Correct 49 ms 72764 KB Output is correct
26 Correct 56 ms 72944 KB Output is correct
27 Correct 60 ms 72812 KB Output is correct
28 Correct 54 ms 72812 KB Output is correct
29 Correct 58 ms 72812 KB Output is correct
30 Correct 59 ms 72816 KB Output is correct

Subtask #3
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 52 ms 72812 KB Output is correct
2 Correct 65 ms 72812 KB Output is correct
3 Correct 50 ms 72684 KB Output is correct
4 Correct 57 ms 72812 KB Output is correct
5 Correct 57 ms 72812 KB Output is correct
6 Correct 50 ms 72812 KB Output is correct
7 Correct 52 ms 72812 KB Output is correct
8 Correct 50 ms 72812 KB Output is correct
9 Correct 53 ms 72812 KB Output is correct
10 Correct 53 ms 72812 KB Output is correct
11 Correct 51 ms 72812 KB Output is correct
12 Correct 51 ms 72832 KB Output is correct
13 Correct 61 ms 72812 KB Output is correct
14 Correct 56 ms 72812 KB Output is correct
15 Correct 52 ms 72812 KB Output is correct
16 Correct 53 ms 72812 KB Output is correct
17 Correct 58 ms 72812 KB Output is correct
18 Correct 57 ms 72812 KB Output is correct
19 Correct 55 ms 72812 KB Output is correct
20 Correct 54 ms 72812 KB Output is correct
21 Correct 59 ms 72812 KB Output is correct
22 Correct 60 ms 72812 KB Output is correct
23 Correct 58 ms 72812 KB Output is correct
24 Correct 52 ms 72940 KB Output is correct
25 Correct 60 ms 73004 KB Output is correct
26 Correct 55 ms 72812 KB Output is correct
27 Correct 54 ms 72812 KB Output is correct
28 Correct 55 ms 72812 KB Output is correct
29 Correct 59 ms 72812 KB Output is correct
30 Correct 56 ms 72812 KB Output is correct
31 Correct 58 ms 72812 KB Output is correct
32 Correct 57 ms 72812 KB Output is correct
33 Correct 58 ms 72812 KB Output is correct
34 Correct 56 ms 72812 KB Output is correct
35 Correct 54 ms 72812 KB Output is correct
36 Correct 65 ms 72812 KB Output is correct
37 Correct 56 ms 72928 KB Output is correct
38 Correct 57 ms 72812 KB Output is correct
39 Correct 54 ms 72812 KB Output is correct
40 Correct 55 ms 72832 KB Output is correct
41 Correct 55 ms 72812 KB Output is correct
42 Correct 49 ms 72764 KB Output is correct
43 Correct 56 ms 72944 KB Output is correct
44 Correct 60 ms 72812 KB Output is correct
45 Correct 54 ms 72812 KB Output is correct
46 Correct 58 ms 72812 KB Output is correct
47 Correct 59 ms 72816 KB Output is correct
48 Correct 175 ms 81596 KB Output is correct
49 Correct 184 ms 82444 KB Output is correct
50 Correct 174 ms 82408 KB Output is correct
51 Correct 158 ms 80356 KB Output is correct
52 Correct 185 ms 82276 KB Output is correct
53 Correct 165 ms 81384 KB Output is correct
54 Correct 112 ms 81900 KB Output is correct
55 Correct 215 ms 91492 KB Output is correct
56 Correct 214 ms 86500 KB Output is correct
57 Correct 209 ms 85176 KB Output is correct
58 Correct 206 ms 84076 KB Output is correct
59 Correct 175 ms 82284 KB Output is correct
60 Correct 157 ms 81896 KB Output is correct
61 Correct 161 ms 81284 KB Output is correct
62 Correct 214 ms 81636 KB Output is correct
63 Correct 147 ms 81252 KB Output is correct
64 Correct 166 ms 81916 KB Output is correct
65 Correct 150 ms 81892 KB Output is correct
66 Correct 143 ms 81256 KB Output is correct
67 Correct 120 ms 79076 KB Output is correct
68 Correct 133 ms 80488 KB Output is correct
69 Correct 149 ms 81892 KB Output is correct
70 Correct 139 ms 81388 KB Output is correct
71 Correct 116 ms 79084 KB Output is correct
72 Correct 130 ms 80092 KB Output is correct
73 Correct 148 ms 81892 KB Output is correct
74 Correct 143 ms 81124 KB Output is correct
75 Correct 172 ms 82244 KB Output is correct
76 Correct 171 ms 81892 KB Output is correct
77 Correct 152 ms 81768 KB Output is correct
78 Correct 117 ms 78828 KB Output is correct
79 Correct 129 ms 79720 KB Output is correct
80 Correct 194 ms 82404 KB Output is correct
81 Correct 156 ms 81764 KB Output is correct
82 Correct 157 ms 81508 KB Output is correct