oj.uz

Submission #415987

# Submission time Handle Problem Language Result Execution time Memory
415987 2021-06-01T19:16:53 Z nicolaalexandra Village (BOI20_village) C++14
75 / 100
 168 ms 20420 KB 
#include <bits/stdc++.h>
#define DIM 100010
#define INF 2000000000
using namespace std;

vector <int> L[DIM],w[DIM];
int v[DIM],fth[DIM],sp[DIM],f[DIM],viz[DIM];
pair <int,int> d[DIM];
int n,i,x,y,sol_min,sol_max,k,idx,poz;


void dfs (int nod, int tata){
    fth[nod] = tata;
    sp[nod] = 1;
    for (auto vecin : L[nod])
        if (vecin != tata){
            dfs (vecin,nod);
            sp[nod] += sp[vecin];
        }

    if (nod != 1 && v[nod] == nod){

        sol_min += 2;
        swap (v[nod],v[fth[nod]]);

    }

    sol_max += 2 * min (sp[nod],n-sp[nod]);

}

int get_centroid (int nod, int tata){

    int maxim = 0, heavy_son = 0;
    for (auto vecin : L[nod]){
        if (vecin == tata)
            continue;
        if (sp[vecin] > maxim)
            maxim = sp[vecin], heavy_son = vecin;
    }

    if (maxim <= n/2 && n - sp[nod] <= n/2)
        return nod;
    else return get_centroid(heavy_son,nod);

}


void dfs2 (int nod, int idx){
    w[idx].push_back(nod);
    viz[nod] = 1;
    f[nod] = idx;
    for (auto vecin : L[nod])
        if (!viz[vecin])
            dfs2 (vecin,idx);
}

inline int cmp (int a, int b){
    return (int)w[a].size() >= (int)w[b].size();
}

int main (){

    //ifstream cin ("date.in");
    //ofstream cout ("date.out");

    cin>>n;
    for (i=1;i<n;i++){
        cin>>x>>y;
        L[x].push_back(y);
        L[y].push_back(x);
    }

    for (i=1;i<=n;i++)
        v[i] = i;

    dfs (1,0);

    for (i=1;i<=n;i++)
        if (v[i] == i){
            sol_min += 2;
            if (i != 1)
                swap (v[i],v[fth[i]]);
            else swap (v[i],v[L[1][0]]);
        }

    cout<<sol_min<<" "<<sol_max<<"\n";
    for (i=1;i<=n;i++)
        cout<<v[i]<<" ";

    cout<<"\n";

    memset (v,0,sizeof v);
    int centroid = get_centroid(1,0);

    viz[centroid] = 1;
    w[centroid].push_back(centroid);
    d[++k] = make_pair(-1,centroid);

    int mini = n, poz;
    for (auto vecin : L[centroid]){
        dfs2 (vecin,vecin);

        d[++k] = make_pair(-(int)w[vecin].size(),vecin);
        //cout<<w[vecin].size()<<"\n";
    }


    sort (d+1,d+k+1);

    for (int poz=2;poz<=k;poz++){

        int i = w[d[poz].second].size()-1;
        int j = w[d[poz-1].second].size()-1;

        while (i >= 0){

            v[w[d[poz].second][i]] = w[d[poz-1].second][j];

            i--, j --;
        }

    }

    idx = 2, poz = w[d[2].second].size() - 1;

    for (i=1;i<=k;i++){

        for (int j=0;j<w[d[i].second].size();j++){

            v[w[d[i].second][j]] = w[d[idx].second][poz];
            poz--;
            if (poz < 0){
                idx++;
                if (idx > k)
                    idx = 1;
                poz = w[d[idx].second].size()-1;
            }
        }

    }


    for (i=1;i<=n;i++)
        cout<<v[i]<<" ";

    /*for (i=1;i<=n;i++)
        if (v[i] == 0)
            cout<<"a";*/

    return 0;
}

Compilation message

Village.cpp: In function 'int main()':
Village.cpp:129:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  129 |         for (int j=0;j<w[d[i].second].size();j++){
      |                      ~^~~~~~~~~~~~~~~~~~~~~~
Village.cpp:100:9: warning: unused variable 'mini' [-Wunused-variable]
  100 |     int mini = n, poz;
      |         ^~~~

Subtask #1
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 5324 KB Output is correct
2 Correct 4 ms 5332 KB Output is correct
3 Correct 4 ms 5324 KB Output is correct
4 Correct 4 ms 5324 KB Output is correct
5 Correct 4 ms 5324 KB Output is correct
6 Correct 4 ms 5324 KB Output is correct
7 Correct 4 ms 5324 KB Output is correct
8 Correct 4 ms 5324 KB Output is correct
9 Correct 3 ms 5404 KB Output is correct
10 Correct 3 ms 5324 KB Output is correct
11 Correct 4 ms 5372 KB Output is correct
12 Correct 4 ms 5408 KB Output is correct
13 Correct 4 ms 5324 KB Output is correct
14 Correct 4 ms 5324 KB Output is correct
15 Correct 3 ms 5324 KB Output is correct
16 Correct 4 ms 5360 KB Output is correct
17 Correct 4 ms 5324 KB Output is correct

Subtask #2
38.0 / 38.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 5368 KB Output is correct
2 Correct 5 ms 5324 KB Output is correct
3 Correct 5 ms 5324 KB Output is correct
4 Correct 5 ms 5396 KB Output is correct
5 Correct 6 ms 5452 KB Output is correct
6 Correct 6 ms 5452 KB Output is correct
7 Correct 5 ms 5452 KB Output is correct
8 Correct 5 ms 5452 KB Output is correct
9 Correct 5 ms 5452 KB Output is correct
10 Correct 6 ms 5420 KB Output is correct
11 Correct 5 ms 5452 KB Output is correct
12 Correct 5 ms 5452 KB Output is correct
13 Correct 5 ms 5452 KB Output is correct
14 Correct 6 ms 5380 KB Output is correct
15 Correct 5 ms 5388 KB Output is correct
16 Correct 5 ms 5452 KB Output is correct
17 Correct 5 ms 5452 KB Output is correct
18 Correct 6 ms 5388 KB Output is correct
19 Correct 6 ms 5452 KB Output is correct
20 Correct 5 ms 5452 KB Output is correct
21 Correct 5 ms 5452 KB Output is correct
22 Correct 5 ms 5452 KB Output is correct
23 Correct 6 ms 5436 KB Output is correct
24 Correct 5 ms 5452 KB Output is correct
25 Correct 5 ms 5324 KB Output is correct
26 Correct 5 ms 5452 KB Output is correct
27 Correct 5 ms 5324 KB Output is correct
28 Correct 6 ms 5452 KB Output is correct
29 Correct 5 ms 5452 KB Output is correct
30 Correct 6 ms 5384 KB Output is correct

Subtask #3
25.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 5324 KB Output is correct
2 Correct 4 ms 5332 KB Output is correct
3 Correct 4 ms 5324 KB Output is correct
4 Correct 4 ms 5324 KB Output is correct
5 Correct 4 ms 5324 KB Output is correct
6 Correct 4 ms 5324 KB Output is correct
7 Correct 4 ms 5324 KB Output is correct
8 Correct 4 ms 5324 KB Output is correct
9 Correct 3 ms 5404 KB Output is correct
10 Correct 3 ms 5324 KB Output is correct
11 Correct 4 ms 5372 KB Output is correct
12 Correct 4 ms 5408 KB Output is correct
13 Correct 4 ms 5324 KB Output is correct
14 Correct 4 ms 5324 KB Output is correct
15 Correct 3 ms 5324 KB Output is correct
16 Correct 4 ms 5360 KB Output is correct
17 Correct 4 ms 5324 KB Output is correct
18 Correct 5 ms 5368 KB Output is correct
19 Correct 5 ms 5324 KB Output is correct
20 Correct 5 ms 5324 KB Output is correct
21 Correct 5 ms 5396 KB Output is correct
22 Correct 6 ms 5452 KB Output is correct
23 Correct 6 ms 5452 KB Output is correct
24 Correct 5 ms 5452 KB Output is correct
25 Correct 5 ms 5452 KB Output is correct
26 Correct 5 ms 5452 KB Output is correct
27 Correct 6 ms 5420 KB Output is correct
28 Correct 5 ms 5452 KB Output is correct
29 Correct 5 ms 5452 KB Output is correct
30 Correct 5 ms 5452 KB Output is correct
31 Correct 6 ms 5380 KB Output is correct
32 Correct 5 ms 5388 KB Output is correct
33 Correct 5 ms 5452 KB Output is correct
34 Correct 5 ms 5452 KB Output is correct
35 Correct 6 ms 5388 KB Output is correct
36 Correct 6 ms 5452 KB Output is correct
37 Correct 5 ms 5452 KB Output is correct
38 Correct 5 ms 5452 KB Output is correct
39 Correct 5 ms 5452 KB Output is correct
40 Correct 6 ms 5436 KB Output is correct
41 Correct 5 ms 5452 KB Output is correct
42 Correct 5 ms 5324 KB Output is correct
43 Correct 5 ms 5452 KB Output is correct
44 Correct 5 ms 5324 KB Output is correct
45 Correct 6 ms 5452 KB Output is correct
46 Correct 5 ms 5452 KB Output is correct
47 Correct 6 ms 5384 KB Output is correct
48 Correct 128 ms 12480 KB Output is correct
49 Correct 152 ms 13084 KB Output is correct
50 Correct 140 ms 13052 KB Output is correct
51 Correct 105 ms 11328 KB Output is correct
52 Correct 141 ms 12968 KB Output is correct
53 Correct 122 ms 12220 KB Output is correct
54 Correct 80 ms 12640 KB Output is correct
55 Partially correct 164 ms 20420 KB Partially correct
56 Partially correct 168 ms 16424 KB Partially correct
57 Correct 168 ms 15248 KB Output is correct
58 Correct 135 ms 14152 KB Output is correct
59 Correct 159 ms 13260 KB Output is correct
60 Correct 139 ms 16504 KB Output is correct
61 Correct 140 ms 13968 KB Output is correct
62 Correct 119 ms 13308 KB Output is correct
63 Correct 123 ms 13000 KB Output is correct
64 Correct 122 ms 13356 KB Output is correct
65 Correct 132 ms 13504 KB Output is correct
66 Correct 120 ms 12912 KB Output is correct
67 Correct 94 ms 11720 KB Output is correct
68 Correct 107 ms 12132 KB Output is correct
69 Correct 141 ms 13540 KB Output is correct
70 Correct 115 ms 12972 KB Output is correct
71 Correct 86 ms 10952 KB Output is correct
72 Correct 125 ms 11744 KB Output is correct
73 Correct 137 ms 13572 KB Output is correct
74 Correct 112 ms 12808 KB Output is correct
75 Correct 134 ms 12832 KB Output is correct
76 Correct 132 ms 12828 KB Output is correct
77 Correct 119 ms 12968 KB Output is correct
78 Correct 83 ms 10508 KB Output is correct
79 Correct 109 ms 11440 KB Output is correct
80 Correct 133 ms 12800 KB Output is correct
81 Correct 120 ms 13124 KB Output is correct
82 Correct 114 ms 13252 KB Output is correct