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Submission #443491

# Submission time Handle Problem Language Result Execution time Memory
443491 2021-07-10T15:13:50 Z leinad2 Fountain Parks (IOI21_parks) C++17
55 / 100
 2439 ms 74736 KB 
#include "parks.h"
#include<bits/stdc++.h>
using namespace std;
int par[400010], chk[400010], chk2[400010], A[400010][2], vis[400010];
int Find(int v){return v==par[v]?v:par[v]=Find(par[v]);}
vector<pair<int, int> >v;
int cnt;
map<pair<int, int>, int>mp;
vector<pair<int, int> >adj[400010];
vector<int>_u, _v, _a, _b;
void dfs(int v)
{
    for(int i=0;i<adj[v].size();i++)
    {
        int p=adj[v][i].first;
        if(!vis[p])vis[p]=1,dfs(p),_a[adj[v][i].second]=p;
    }
}
int construct_roads(vector<int>x, vector<int>y)
{
    int n, i, j, k, a, b;
    n=x.size();
    vector<pair<pair<int, int>, int> >V;
    for(i=0;i<n;i++)
    {
        V.push_back({{x[i], y[i]}, i});
    }
    sort(V.begin(), V.end());
    for(i=1;i<V.size();i++)
    {
        if(V[i].first.first==V[i-1].first.first&&V[i].first.second==V[i-1].first.second+2)
        {
            v.push_back({V[i].second, V[i-1].second});
        }
    }
    for(i=0;i<n;i++)
    {
        swap(V[i].first.first, V[i].first.second);
    }
    sort(V.begin(), V.end());
    for(i=1;i<V.size();i++)
    {
        if(V[i].first.first==V[i-1].first.first&&V[i].first.second==V[i-1].first.second+2)
        {
            v.push_back({V[i].second, V[i-1].second});
        }
    }
    for(int rng=0;rng<5;rng++)
    {
        for(i=0;i<n;i++)par[i]=i;
        random_shuffle(v.begin(), v.end());
        _u.clear();_v.clear();_a.clear();_b.clear();cnt=0;mp.clear();for(i=1;i<=2*n;i++)vis[i]=chk[i]=chk2[i]=0,adj[i].clear();
        for(i=0;i<v.size();i++)
        {
            if(Find(v[i].first)!=Find(v[i].second))
            {
                _u.push_back(v[i].first);
                _v.push_back(v[i].second);
                par[Find(v[i].first)]=Find(v[i].second);
            }
        }
        if(_u.size()!=n-1)return 0;
        vector<pair<int, int> >edge;
        _a.resize(n-1);_b.resize(n-1);
        for(i=0;i<_u.size();i++)
        {
            int a=_u[i], b=_v[i], q, w, e, r;
            if(x[a]==x[b])
            {
                q=x[a]-1;e=x[a]+1;
                w=r=(y[a]+y[b])/2;
            }
            else
            {
                w=y[a]-1;r=y[a]+1;
                q=e=(x[a]+x[b])/2;
            }
            if(mp.find({q, w})==mp.end())mp[{q, w}]=++cnt,A[cnt][0]=q,A[cnt][1]=w;
            if(mp.find({e, r})==mp.end())mp[{e, r}]=++cnt,A[cnt][0]=e,A[cnt][1]=r;
            int x=mp[{q, w}];int y=mp[{e, r}];
            edge.push_back({x, y});
        }
        for(i=0;i++<cnt;)par[i]=i;
        for(i=0;i<edge.size();i++)par[Find(edge[i].first)]=Find(edge[i].second);
        for(i=0;i++<cnt;)chk[Find(i)]++;
        for(i=0;i<edge.size();i++)chk2[Find(edge[i].first)]++;
        for(i=0;i<edge.size();i++)
        {
            adj[edge[i].first].push_back({edge[i].second, i});
            adj[edge[i].second].push_back({edge[i].first, i});
        }
        bool flag=true;
        for(i=0;i++<cnt;)
        {
            if(chk[i])
            {
                if(chk[i]<chk2[i]){flag=false;break;}
                else vis[i]=1,dfs(i);
            }
        }
        if(!flag)continue;
        for(i=0;i<_a.size();i++)
        {
            if(_a[i]==0)_a[i]=Find(edge[i].first);
            int a=_a[i];
            _a[i]=A[a][0];_b[i]=A[a][1];
        }
        build(_u, _v, _a, _b);
        return 1;
    }
    return 0;
}

Compilation message

parks.cpp: In function 'void dfs(int)':
parks.cpp:13:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   13 |     for(int i=0;i<adj[v].size();i++)
      |                 ~^~~~~~~~~~~~~~
parks.cpp: In function 'int construct_roads(std::vector<int>, std::vector<int>)':
parks.cpp:29:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<std::pair<int, int>, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   29 |     for(i=1;i<V.size();i++)
      |             ~^~~~~~~~~
parks.cpp:41:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<std::pair<int, int>, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   41 |     for(i=1;i<V.size();i++)
      |             ~^~~~~~~~~
parks.cpp:53:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   53 |         for(i=0;i<v.size();i++)
      |                 ~^~~~~~~~~
parks.cpp:62:21: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   62 |         if(_u.size()!=n-1)return 0;
      |            ~~~~~~~~~^~~~~
parks.cpp:65:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   65 |         for(i=0;i<_u.size();i++)
      |                 ~^~~~~~~~~~
parks.cpp:84:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   84 |         for(i=0;i<edge.size();i++)par[Find(edge[i].first)]=Find(edge[i].second);
      |                 ~^~~~~~~~~~~~
parks.cpp:86:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   86 |         for(i=0;i<edge.size();i++)chk2[Find(edge[i].first)]++;
      |                 ~^~~~~~~~~~~~
parks.cpp:87:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   87 |         for(i=0;i<edge.size();i++)
      |                 ~^~~~~~~~~~~~
parks.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(i=0;i<_a.size();i++)
      |                 ~^~~~~~~~~~
parks.cpp:21:15: warning: unused variable 'j' [-Wunused-variable]
   21 |     int n, i, j, k, a, b;
      |               ^
parks.cpp:21:18: warning: unused variable 'k' [-Wunused-variable]
   21 |     int n, i, j, k, a, b;
      |                  ^
parks.cpp:21:21: warning: unused variable 'a' [-Wunused-variable]
   21 |     int n, i, j, k, a, b;
      |                     ^
parks.cpp:21:24: warning: unused variable 'b' [-Wunused-variable]
   21 |     int n, i, j, k, a, b;
      |                        ^

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 9676 KB Output is correct
2 Correct 7 ms 9676 KB Output is correct
3 Correct 6 ms 9676 KB Output is correct
4 Correct 7 ms 9676 KB Output is correct
5 Correct 6 ms 9676 KB Output is correct
6 Correct 6 ms 9676 KB Output is correct
7 Correct 7 ms 9676 KB Output is correct
8 Correct 6 ms 9676 KB Output is correct
9 Correct 277 ms 42284 KB Output is correct
10 Correct 26 ms 12932 KB Output is correct
11 Correct 116 ms 27200 KB Output is correct
12 Correct 34 ms 14596 KB Output is correct
13 Correct 21 ms 13128 KB Output is correct
14 Correct 7 ms 9692 KB Output is correct
15 Correct 7 ms 9816 KB Output is correct
16 Correct 252 ms 42248 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 9676 KB Output is correct
2 Correct 7 ms 9676 KB Output is correct
3 Correct 6 ms 9676 KB Output is correct
4 Correct 7 ms 9676 KB Output is correct
5 Correct 6 ms 9676 KB Output is correct
6 Correct 6 ms 9676 KB Output is correct
7 Correct 7 ms 9676 KB Output is correct
8 Correct 6 ms 9676 KB Output is correct
9 Correct 277 ms 42284 KB Output is correct
10 Correct 26 ms 12932 KB Output is correct
11 Correct 116 ms 27200 KB Output is correct
12 Correct 34 ms 14596 KB Output is correct
13 Correct 21 ms 13128 KB Output is correct
14 Correct 7 ms 9692 KB Output is correct
15 Correct 7 ms 9816 KB Output is correct
16 Correct 252 ms 42248 KB Output is correct
17 Correct 6 ms 9804 KB Output is correct
18 Correct 6 ms 9676 KB Output is correct
19 Correct 6 ms 9676 KB Output is correct
20 Correct 6 ms 9676 KB Output is correct
21 Correct 6 ms 9676 KB Output is correct
22 Correct 6 ms 9712 KB Output is correct
23 Correct 625 ms 59796 KB Output is correct
24 Correct 6 ms 9676 KB Output is correct
25 Correct 8 ms 9932 KB Output is correct
26 Correct 8 ms 9932 KB Output is correct
27 Correct 9 ms 10004 KB Output is correct
28 Correct 210 ms 29700 KB Output is correct
29 Correct 343 ms 39888 KB Output is correct
30 Correct 492 ms 49540 KB Output is correct
31 Correct 666 ms 59828 KB Output is correct
32 Correct 7 ms 9676 KB Output is correct
33 Correct 7 ms 9676 KB Output is correct
34 Correct 7 ms 9676 KB Output is correct
35 Correct 7 ms 9676 KB Output is correct
36 Correct 6 ms 9676 KB Output is correct
37 Correct 7 ms 9720 KB Output is correct
38 Correct 8 ms 9676 KB Output is correct
39 Correct 6 ms 9676 KB Output is correct
40 Correct 7 ms 9676 KB Output is correct
41 Correct 7 ms 9652 KB Output is correct
42 Correct 6 ms 9676 KB Output is correct
43 Correct 7 ms 9808 KB Output is correct
44 Correct 7 ms 9912 KB Output is correct
45 Correct 300 ms 35772 KB Output is correct
46 Correct 427 ms 47364 KB Output is correct
47 Correct 435 ms 47412 KB Output is correct

Subtask #3
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 9676 KB Output is correct
2 Correct 7 ms 9676 KB Output is correct
3 Correct 6 ms 9676 KB Output is correct
4 Correct 7 ms 9676 KB Output is correct
5 Correct 6 ms 9676 KB Output is correct
6 Correct 6 ms 9676 KB Output is correct
7 Correct 7 ms 9676 KB Output is correct
8 Correct 6 ms 9676 KB Output is correct
9 Correct 277 ms 42284 KB Output is correct
10 Correct 26 ms 12932 KB Output is correct
11 Correct 116 ms 27200 KB Output is correct
12 Correct 34 ms 14596 KB Output is correct
13 Correct 21 ms 13128 KB Output is correct
14 Correct 7 ms 9692 KB Output is correct
15 Correct 7 ms 9816 KB Output is correct
16 Correct 252 ms 42248 KB Output is correct
17 Correct 6 ms 9804 KB Output is correct
18 Correct 6 ms 9676 KB Output is correct
19 Correct 6 ms 9676 KB Output is correct
20 Correct 6 ms 9676 KB Output is correct
21 Correct 6 ms 9676 KB Output is correct
22 Correct 6 ms 9712 KB Output is correct
23 Correct 625 ms 59796 KB Output is correct
24 Correct 6 ms 9676 KB Output is correct
25 Correct 8 ms 9932 KB Output is correct
26 Correct 8 ms 9932 KB Output is correct
27 Correct 9 ms 10004 KB Output is correct
28 Correct 210 ms 29700 KB Output is correct
29 Correct 343 ms 39888 KB Output is correct
30 Correct 492 ms 49540 KB Output is correct
31 Correct 666 ms 59828 KB Output is correct
32 Correct 7 ms 9676 KB Output is correct
33 Correct 7 ms 9676 KB Output is correct
34 Correct 7 ms 9676 KB Output is correct
35 Correct 7 ms 9676 KB Output is correct
36 Correct 6 ms 9676 KB Output is correct
37 Correct 7 ms 9720 KB Output is correct
38 Correct 8 ms 9676 KB Output is correct
39 Correct 6 ms 9676 KB Output is correct
40 Correct 7 ms 9676 KB Output is correct
41 Correct 7 ms 9652 KB Output is correct
42 Correct 6 ms 9676 KB Output is correct
43 Correct 7 ms 9808 KB Output is correct
44 Correct 7 ms 9912 KB Output is correct
45 Correct 300 ms 35772 KB Output is correct
46 Correct 427 ms 47364 KB Output is correct
47 Correct 435 ms 47412 KB Output is correct
48 Correct 6 ms 9676 KB Output is correct
49 Correct 6 ms 9676 KB Output is correct
50 Correct 6 ms 9676 KB Output is correct
51 Correct 6 ms 9680 KB Output is correct
52 Correct 6 ms 9728 KB Output is correct
53 Correct 6 ms 9676 KB Output is correct
54 Correct 7 ms 9676 KB Output is correct
55 Incorrect 2439 ms 55692 KB Solution announced impossible, but it is possible.
56 Halted 0 ms 0 KB -

Subtask #4
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 9676 KB Output is correct
2 Correct 7 ms 9676 KB Output is correct
3 Correct 6 ms 9676 KB Output is correct
4 Correct 7 ms 9676 KB Output is correct
5 Correct 6 ms 9676 KB Output is correct
6 Correct 6 ms 9676 KB Output is correct
7 Correct 7 ms 9676 KB Output is correct
8 Correct 6 ms 9676 KB Output is correct
9 Correct 277 ms 42284 KB Output is correct
10 Correct 26 ms 12932 KB Output is correct
11 Correct 116 ms 27200 KB Output is correct
12 Correct 34 ms 14596 KB Output is correct
13 Correct 21 ms 13128 KB Output is correct
14 Correct 7 ms 9692 KB Output is correct
15 Correct 7 ms 9816 KB Output is correct
16 Correct 252 ms 42248 KB Output is correct
17 Correct 6 ms 9676 KB Output is correct
18 Correct 6 ms 9676 KB Output is correct
19 Correct 6 ms 9676 KB Output is correct
20 Correct 679 ms 60744 KB Output is correct
21 Correct 605 ms 58136 KB Output is correct
22 Correct 605 ms 57932 KB Output is correct
23 Correct 488 ms 64896 KB Output is correct
24 Correct 97 ms 20660 KB Output is correct
25 Correct 116 ms 25140 KB Output is correct
26 Correct 116 ms 25080 KB Output is correct
27 Correct 651 ms 74692 KB Output is correct
28 Correct 623 ms 74476 KB Output is correct
29 Correct 592 ms 74548 KB Output is correct
30 Correct 611 ms 74680 KB Output is correct
31 Correct 7 ms 9676 KB Output is correct
32 Correct 35 ms 13264 KB Output is correct
33 Correct 44 ms 15212 KB Output is correct
34 Correct 640 ms 63088 KB Output is correct
35 Correct 11 ms 10512 KB Output is correct
36 Correct 33 ms 13480 KB Output is correct
37 Correct 64 ms 17176 KB Output is correct
38 Correct 211 ms 29012 KB Output is correct
39 Correct 312 ms 36024 KB Output is correct
40 Correct 456 ms 43280 KB Output is correct
41 Correct 518 ms 50448 KB Output is correct
42 Correct 622 ms 57528 KB Output is correct
43 Correct 6 ms 9676 KB Output is correct
44 Correct 6 ms 9676 KB Output is correct
45 Correct 6 ms 9676 KB Output is correct
46 Correct 7 ms 9676 KB Output is correct
47 Correct 7 ms 9696 KB Output is correct
48 Correct 6 ms 9676 KB Output is correct
49 Correct 6 ms 9676 KB Output is correct
50 Correct 6 ms 9676 KB Output is correct
51 Correct 7 ms 9676 KB Output is correct
52 Correct 6 ms 9676 KB Output is correct
53 Correct 6 ms 9676 KB Output is correct
54 Correct 7 ms 9804 KB Output is correct
55 Correct 8 ms 9932 KB Output is correct
56 Correct 286 ms 35748 KB Output is correct
57 Correct 417 ms 47336 KB Output is correct
58 Correct 434 ms 47404 KB Output is correct
59 Correct 6 ms 9676 KB Output is correct
60 Correct 6 ms 9676 KB Output is correct
61 Correct 7 ms 9676 KB Output is correct
62 Correct 592 ms 74576 KB Output is correct
63 Correct 600 ms 74556 KB Output is correct
64 Correct 594 ms 74420 KB Output is correct
65 Correct 8 ms 9932 KB Output is correct
66 Correct 10 ms 10188 KB Output is correct
67 Correct 272 ms 35216 KB Output is correct
68 Correct 457 ms 47800 KB Output is correct
69 Correct 637 ms 60600 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 9676 KB Output is correct
2 Correct 7 ms 9676 KB Output is correct
3 Correct 6 ms 9676 KB Output is correct
4 Correct 7 ms 9676 KB Output is correct
5 Correct 6 ms 9676 KB Output is correct
6 Correct 6 ms 9676 KB Output is correct
7 Correct 7 ms 9676 KB Output is correct
8 Correct 6 ms 9676 KB Output is correct
9 Correct 277 ms 42284 KB Output is correct
10 Correct 26 ms 12932 KB Output is correct
11 Correct 116 ms 27200 KB Output is correct
12 Correct 34 ms 14596 KB Output is correct
13 Correct 21 ms 13128 KB Output is correct
14 Correct 7 ms 9692 KB Output is correct
15 Correct 7 ms 9816 KB Output is correct
16 Correct 252 ms 42248 KB Output is correct
17 Correct 617 ms 74568 KB Output is correct
18 Correct 596 ms 74736 KB Output is correct
19 Correct 589 ms 62896 KB Output is correct
20 Correct 702 ms 58628 KB Output is correct
21 Correct 590 ms 60200 KB Output is correct
22 Correct 6 ms 9676 KB Output is correct
23 Correct 73 ms 17868 KB Output is correct
24 Correct 17 ms 11260 KB Output is correct
25 Correct 48 ms 15292 KB Output is correct
26 Correct 74 ms 18732 KB Output is correct
27 Correct 281 ms 34524 KB Output is correct
28 Correct 366 ms 41516 KB Output is correct
29 Correct 482 ms 46928 KB Output is correct
30 Correct 576 ms 52920 KB Output is correct
31 Correct 625 ms 59088 KB Output is correct
32 Correct 676 ms 63592 KB Output is correct
33 Correct 599 ms 74640 KB Output is correct
34 Correct 9 ms 10060 KB Output is correct
35 Correct 11 ms 10436 KB Output is correct
36 Correct 247 ms 35488 KB Output is correct
37 Correct 435 ms 48464 KB Output is correct
38 Correct 644 ms 61172 KB Output is correct

Subtask #6
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 9676 KB Output is correct
2 Correct 7 ms 9676 KB Output is correct
3 Correct 6 ms 9676 KB Output is correct
4 Correct 7 ms 9676 KB Output is correct
5 Correct 6 ms 9676 KB Output is correct
6 Correct 6 ms 9676 KB Output is correct
7 Correct 7 ms 9676 KB Output is correct
8 Correct 6 ms 9676 KB Output is correct
9 Correct 277 ms 42284 KB Output is correct
10 Correct 26 ms 12932 KB Output is correct
11 Correct 116 ms 27200 KB Output is correct
12 Correct 34 ms 14596 KB Output is correct
13 Correct 21 ms 13128 KB Output is correct
14 Correct 7 ms 9692 KB Output is correct
15 Correct 7 ms 9816 KB Output is correct
16 Correct 252 ms 42248 KB Output is correct
17 Correct 6 ms 9804 KB Output is correct
18 Correct 6 ms 9676 KB Output is correct
19 Correct 6 ms 9676 KB Output is correct
20 Correct 6 ms 9676 KB Output is correct
21 Correct 6 ms 9676 KB Output is correct
22 Correct 6 ms 9712 KB Output is correct
23 Correct 625 ms 59796 KB Output is correct
24 Correct 6 ms 9676 KB Output is correct
25 Correct 8 ms 9932 KB Output is correct
26 Correct 8 ms 9932 KB Output is correct
27 Correct 9 ms 10004 KB Output is correct
28 Correct 210 ms 29700 KB Output is correct
29 Correct 343 ms 39888 KB Output is correct
30 Correct 492 ms 49540 KB Output is correct
31 Correct 666 ms 59828 KB Output is correct
32 Correct 7 ms 9676 KB Output is correct
33 Correct 7 ms 9676 KB Output is correct
34 Correct 7 ms 9676 KB Output is correct
35 Correct 7 ms 9676 KB Output is correct
36 Correct 6 ms 9676 KB Output is correct
37 Correct 7 ms 9720 KB Output is correct
38 Correct 8 ms 9676 KB Output is correct
39 Correct 6 ms 9676 KB Output is correct
40 Correct 7 ms 9676 KB Output is correct
41 Correct 7 ms 9652 KB Output is correct
42 Correct 6 ms 9676 KB Output is correct
43 Correct 7 ms 9808 KB Output is correct
44 Correct 7 ms 9912 KB Output is correct
45 Correct 300 ms 35772 KB Output is correct
46 Correct 427 ms 47364 KB Output is correct
47 Correct 435 ms 47412 KB Output is correct
48 Correct 6 ms 9676 KB Output is correct
49 Correct 6 ms 9676 KB Output is correct
50 Correct 6 ms 9676 KB Output is correct
51 Correct 6 ms 9680 KB Output is correct
52 Correct 6 ms 9728 KB Output is correct
53 Correct 6 ms 9676 KB Output is correct
54 Correct 7 ms 9676 KB Output is correct
55 Incorrect 2439 ms 55692 KB Solution announced impossible, but it is possible.
56 Halted 0 ms 0 KB -