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Submission #584257

# Submission time Handle Problem Language Result Execution time Memory
584257 2022-06-27T05:59:40 Z 조영욱(#8377) Meetings 2 (JOI21_meetings2) C++17
100 / 100
 394 ms 40964 KB 
#include <bits/stdc++.h>
using namespace std;

int sz[200001];
vector<int> adj[200001];
typedef pair<int,int> P;
P val[200001];
int ret[100001];
int table[200001][18];
int dep[200001];

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

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;
}

int lca(int a,int b) {
    if (dep[a]<dep[b]) {
        swap(a,b);
    }
    int diff=dep[a]-dep[b];
    for(int i=0;diff;i++) {
        if (diff&1) {
            a=table[a][i];
        }
        diff/=2;
    }
if (a==b) return a;
    for(int i=16;i>=0;i--) {
        if (table[a][i]!=0&&table[a][i]!=table[b][i]) {
            a=table[a][i];
            b=table[b][i];
        }
    }
    return table[a][0];
}

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

int main() {
    int n;
    scanf("%d",&n);
    for(int i=1;i<n;i++) {
        int u,v;
        scanf("%d %d",&u,&v);
        adj[u].push_back(v);
        adj[v].push_back(u);
    }
    dfs(1,0);
    int c=getcent(1,0,n/2);
    dep[c]=0;
    dfs(c,0);
    for(int j=1;j<17;j++) {
        for(int i=1;i<=n;i++) {
            if (table[i][j-1]!=0) {
                table[i][j]=table[table[i][j-1]][j-1];
            }
        }
    }
    for(int i=1;i<=n;i++) {
        val[i].first=n;
if (i==c) {
int mx=0;
        for(int j=0;j<adj[i].size();j++) {
            mx=max(mx,sz[adj[i][j]]);
        }
val[i].first=n-mx;
}
else {
val[i].first=sz[i];
}
//printf("%d\n",val[i].first);
        val[i].second=i;
    }
    sort(val+1,val+n+1);
    reverse(val+1,val+n+1);
    int ind=1;
    int one=0;
    int two=0;
    int mx=-1;
    for(int i=n;i>0;i--) {
        while (ind<=n&&val[ind].first==i) {
            int now=val[ind].second;
            if (one==0) {
                one=now;
                two=now;
                mx=0;
                continue;
            }
            if (dist(one,now)>mx) {
                mx=dist(one,now);
                two=now;
            }
            else if (dist(now,two)>mx) {
                mx=dist(now,two);
                one=now;
            }
ind++;
        }
if (i<=n/2)
        ret[i]=mx+1;
    }
    for(int i=1;i<=n;i++) {
        printf("%d\n",i%2==0?ret[i/2]:1);
    }
    return 0;
}

Compilation message

meetings2.cpp: In function 'void dfs(int, int)':
meetings2.cpp:15:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   15 |     for(int i=0;i<adj[v].size();i++) {
      |                 ~^~~~~~~~~~~~~~
meetings2.cpp: In function 'int getcent(int, int, int)':
meetings2.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<adj[v].size();i++) {
      |                 ~^~~~~~~~~~~~~~
meetings2.cpp: In function 'int main()':
meetings2.cpp:88:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   88 |         for(int j=0;j<adj[i].size();j++) {
      |                     ~^~~~~~~~~~~~~~
meetings2.cpp:66:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   66 |     scanf("%d",&n);
      |     ~~~~~^~~~~~~~~
meetings2.cpp:69:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   69 |         scanf("%d %d",&u,&v);
      |         ~~~~~^~~~~~~~~~~~~~~

Subtask #1
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 4948 KB Output is correct
2 Correct 2 ms 4948 KB Output is correct
3 Correct 2 ms 4948 KB Output is correct
4 Correct 2 ms 4948 KB Output is correct
5 Correct 3 ms 4948 KB Output is correct
6 Correct 3 ms 4948 KB Output is correct
7 Correct 3 ms 4948 KB Output is correct
8 Correct 3 ms 4948 KB Output is correct
9 Correct 2 ms 4948 KB Output is correct
10 Correct 3 ms 4948 KB Output is correct
11 Correct 3 ms 4948 KB Output is correct
12 Correct 3 ms 4948 KB Output is correct
13 Correct 3 ms 4948 KB Output is correct
14 Correct 3 ms 4948 KB Output is correct
15 Correct 3 ms 4948 KB Output is correct
16 Correct 4 ms 4936 KB Output is correct
17 Correct 3 ms 4948 KB Output is correct
18 Correct 2 ms 4948 KB Output is correct
19 Correct 3 ms 4980 KB Output is correct
20 Correct 3 ms 4948 KB Output is correct
21 Correct 3 ms 4948 KB Output is correct

Subtask #2
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 4948 KB Output is correct
2 Correct 2 ms 4948 KB Output is correct
3 Correct 2 ms 4948 KB Output is correct
4 Correct 2 ms 4948 KB Output is correct
5 Correct 3 ms 4948 KB Output is correct
6 Correct 3 ms 4948 KB Output is correct
7 Correct 3 ms 4948 KB Output is correct
8 Correct 3 ms 4948 KB Output is correct
9 Correct 2 ms 4948 KB Output is correct
10 Correct 3 ms 4948 KB Output is correct
11 Correct 3 ms 4948 KB Output is correct
12 Correct 3 ms 4948 KB Output is correct
13 Correct 3 ms 4948 KB Output is correct
14 Correct 3 ms 4948 KB Output is correct
15 Correct 3 ms 4948 KB Output is correct
16 Correct 4 ms 4936 KB Output is correct
17 Correct 3 ms 4948 KB Output is correct
18 Correct 2 ms 4948 KB Output is correct
19 Correct 3 ms 4980 KB Output is correct
20 Correct 3 ms 4948 KB Output is correct
21 Correct 3 ms 4948 KB Output is correct
22 Correct 5 ms 5460 KB Output is correct
23 Correct 5 ms 5460 KB Output is correct
24 Correct 5 ms 5460 KB Output is correct
25 Correct 5 ms 5460 KB Output is correct
26 Correct 7 ms 5496 KB Output is correct
27 Correct 5 ms 5460 KB Output is correct
28 Correct 5 ms 5508 KB Output is correct
29 Correct 7 ms 5460 KB Output is correct
30 Correct 7 ms 5460 KB Output is correct
31 Correct 6 ms 5460 KB Output is correct
32 Correct 10 ms 5616 KB Output is correct
33 Correct 7 ms 5716 KB Output is correct
34 Correct 6 ms 5460 KB Output is correct
35 Correct 5 ms 5460 KB Output is correct
36 Correct 7 ms 5544 KB Output is correct
37 Correct 5 ms 5460 KB Output is correct
38 Correct 5 ms 5588 KB Output is correct

Subtask #3
80.0 / 80.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 4948 KB Output is correct
2 Correct 2 ms 4948 KB Output is correct
3 Correct 2 ms 4948 KB Output is correct
4 Correct 2 ms 4948 KB Output is correct
5 Correct 3 ms 4948 KB Output is correct
6 Correct 3 ms 4948 KB Output is correct
7 Correct 3 ms 4948 KB Output is correct
8 Correct 3 ms 4948 KB Output is correct
9 Correct 2 ms 4948 KB Output is correct
10 Correct 3 ms 4948 KB Output is correct
11 Correct 3 ms 4948 KB Output is correct
12 Correct 3 ms 4948 KB Output is correct
13 Correct 3 ms 4948 KB Output is correct
14 Correct 3 ms 4948 KB Output is correct
15 Correct 3 ms 4948 KB Output is correct
16 Correct 4 ms 4936 KB Output is correct
17 Correct 3 ms 4948 KB Output is correct
18 Correct 2 ms 4948 KB Output is correct
19 Correct 3 ms 4980 KB Output is correct
20 Correct 3 ms 4948 KB Output is correct
21 Correct 3 ms 4948 KB Output is correct
22 Correct 5 ms 5460 KB Output is correct
23 Correct 5 ms 5460 KB Output is correct
24 Correct 5 ms 5460 KB Output is correct
25 Correct 5 ms 5460 KB Output is correct
26 Correct 7 ms 5496 KB Output is correct
27 Correct 5 ms 5460 KB Output is correct
28 Correct 5 ms 5508 KB Output is correct
29 Correct 7 ms 5460 KB Output is correct
30 Correct 7 ms 5460 KB Output is correct
31 Correct 6 ms 5460 KB Output is correct
32 Correct 10 ms 5616 KB Output is correct
33 Correct 7 ms 5716 KB Output is correct
34 Correct 6 ms 5460 KB Output is correct
35 Correct 5 ms 5460 KB Output is correct
36 Correct 7 ms 5544 KB Output is correct
37 Correct 5 ms 5460 KB Output is correct
38 Correct 5 ms 5588 KB Output is correct
39 Correct 236 ms 29032 KB Output is correct
40 Correct 248 ms 30840 KB Output is correct
41 Correct 216 ms 31568 KB Output is correct
42 Correct 246 ms 32028 KB Output is correct
43 Correct 234 ms 32004 KB Output is correct
44 Correct 240 ms 31976 KB Output is correct
45 Correct 394 ms 36932 KB Output is correct
46 Correct 245 ms 40964 KB Output is correct
47 Correct 202 ms 32276 KB Output is correct
48 Correct 141 ms 32460 KB Output is correct
49 Correct 258 ms 32556 KB Output is correct
50 Correct 164 ms 32560 KB Output is correct
51 Correct 232 ms 39840 KB Output is correct