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Submission #634372

# Submission time Handle Problem Language Result Execution time Memory
634372 2022-08-24T10:09:32 Z Rafi22 Parking (CEOI22_parking) C++14
100 / 100
 641 ms 48988 KB 
#include <bits/stdc++.h>

using namespace std;

//#define endl '\n'
#define st first
#define nd second
#define pb push_back
#define sz(x) (int)(x).size()
#define all(x) (x).begin(), (x).end()
#define ll long long
#define ld long double
ll mod=1000000007;
int inf=1000000007;
ll infl=1000000000000000007;

const int N=200007;

int a[2*N];
set<int>id[2*N];
vector<pair<int,int>>ans;

set<int>fre;
set<int>one;

void check(int x) ;

void mov(int x,int y)
{
    fre.erase(y);
    ans.pb({x,y});
    if(a[2*x+1]>0)
    {
        one.insert(x);
        id[a[2*x+1]].erase(2*x+1);
        if(a[2*y]==0)
        {
            one.insert(y);
            a[2*y]=a[2*x+1];
            id[a[2*x+1]].insert(2*y);
        }
        else
        {
            one.erase(y);
            a[2*y+1]=a[2*x+1];
            id[a[2*x+1]].insert(2*y+1);
        }
        int t=a[2*x+1];
        a[2*x+1]=0;
        check(a[2*x]);
        check(t);
    }
    else
    {
        one.erase(x);
        fre.insert(x);
        id[a[2*x]].erase(2*x);
        if(a[2*y]==0)
        {
            one.insert(y);
            a[2*y]=a[2*x];
            id[a[2*x]].insert(2*y);
        }
        else
        {
            one.erase(y);
            a[2*y+1]=a[2*x];
            id[a[2*x]].insert(2*y+1);
        }
        int t=a[2*x];
        a[2*x]=0;
        check(t);
    }
}

void check(int x)
{
    int i=*id[x].begin(),j=*++id[x].begin();
    if(i%2==1&&j%2==0&&a[j+1]==0) mov(i/2,j/2);
    if(i%2==0&&j%2==1&&a[i+1]==0) mov(j/2,i/2);
    if(i%2==0&&j%2==0&&a[i+1]==0&&a[j+1]==0) mov(i/2,j/2);
}

void gg()
{
    cout<<-1;
    exit(0);
}

void check_one()
{
    while(sz(one)>0)
    {
        int x=*one.begin(),y;
        x*=2;
        bool top=0;
        while(true)
        {
            y=a[x];
            if(x%2==0)
            {
                if(top)
                {
                    if(sz(fre)==0) gg();
                    mov(x/2,*fre.begin());
                    break;
                }
                top=0;
            }
            else top=1;
            if(*id[y].begin()==x) x=*++id[y].begin();
            else x=*id[y].begin();
            x^=1;
        }
    }
}

int main()
{
  //  freopen("parking.in.3a","r",stdin);
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    int n,m;
    cin>>n>>m;
    for(int i=1;i<=m;i++)
    {
        cin>>a[2*i]>>a[2*i+1];
        if(a[2*i]==0&&a[2*i+1]==0) fre.insert(i);
        else if(a[2*i+1]==0) one.insert(i);
        id[a[2*i]].insert(2*i);
        id[a[2*i+1]].insert(2*i+1);
    }
    //kasuje to co mo¿na od razu
    for(int i=1;i<=n;i++) check(i);
    //kasuje wszytsko co zaczyna siê od pojedynczego
    check_one();
    //teraz cykle z 2 gornymi elementami
   for(int i=1;i<=n;i++)
    {
        if(*id[i].begin()%2==1&&*++id[i].begin()%2==1)
        {
            if(sz(fre)==0) gg();
            mov(*id[i].begin()/2,*fre.begin());
            check_one();
        }
    }
    //teraz zwykle cykle
    for(int i=1;i<=m;i++)
    {
        if(a[2*i]>0&&a[2*i]!=a[2*i+1])
        {
            if(sz(fre)==0) gg();
            mov(i,*fre.begin());
        }
    }
     for(int i=1;i<=m;i++) if(a[2*i]!=a[2*i+1]) return 2137;
    cout<<sz(ans)<<endl;
    for(auto x:ans) cout<<x.st<<" "<<x.nd<<endl;


    return 0;
}

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 19028 KB Output is correct
2 Correct 10 ms 19028 KB Output is correct
3 Correct 9 ms 19028 KB Output is correct
4 Correct 9 ms 19028 KB Output is correct
5 Correct 11 ms 19156 KB Output is correct
6 Correct 9 ms 19120 KB Output is correct
7 Correct 9 ms 19028 KB Output is correct
8 Correct 10 ms 19028 KB Output is correct
9 Correct 9 ms 19028 KB Output is correct
10 Correct 11 ms 19156 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 425 ms 48720 KB Output is correct
2 Correct 510 ms 48224 KB Output is correct
3 Correct 361 ms 48856 KB Output is correct
4 Correct 341 ms 48836 KB Output is correct
5 Correct 495 ms 48988 KB Output is correct

Subtask #3
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 19156 KB Output is correct
2 Correct 11 ms 19132 KB Output is correct
3 Correct 11 ms 19156 KB Output is correct
4 Correct 12 ms 19156 KB Output is correct
5 Correct 12 ms 19156 KB Output is correct
6 Correct 10 ms 19156 KB Output is correct
7 Correct 13 ms 19284 KB Output is correct
8 Correct 11 ms 19156 KB Output is correct
9 Correct 12 ms 19156 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 19156 KB Output is correct
2 Correct 11 ms 19132 KB Output is correct
3 Correct 11 ms 19156 KB Output is correct
4 Correct 12 ms 19156 KB Output is correct
5 Correct 12 ms 19156 KB Output is correct
6 Correct 10 ms 19156 KB Output is correct
7 Correct 13 ms 19284 KB Output is correct
8 Correct 11 ms 19156 KB Output is correct
9 Correct 12 ms 19156 KB Output is correct
10 Correct 596 ms 44460 KB Output is correct
11 Correct 121 ms 38920 KB Output is correct
12 Correct 160 ms 39076 KB Output is correct
13 Correct 504 ms 43424 KB Output is correct
14 Correct 179 ms 39768 KB Output is correct
15 Correct 180 ms 38996 KB Output is correct
16 Correct 638 ms 44916 KB Output is correct
17 Correct 172 ms 38876 KB Output is correct
18 Correct 548 ms 44424 KB Output is correct

Subtask #5
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 19156 KB Output is correct
2 Correct 10 ms 19156 KB Output is correct
3 Correct 12 ms 19156 KB Output is correct
4 Correct 11 ms 19156 KB Output is correct
5 Correct 10 ms 19156 KB Output is correct
6 Correct 12 ms 19156 KB Output is correct
7 Correct 11 ms 19156 KB Output is correct
8 Correct 12 ms 19156 KB Output is correct
9 Correct 12 ms 19156 KB Output is correct
10 Correct 10 ms 19156 KB Output is correct
11 Correct 12 ms 19156 KB Output is correct
12 Correct 12 ms 19156 KB Output is correct
13 Correct 10 ms 19156 KB Output is correct
14 Correct 11 ms 19156 KB Output is correct
15 Correct 10 ms 19156 KB Output is correct
16 Correct 12 ms 19156 KB Output is correct
17 Correct 12 ms 19220 KB Output is correct
18 Correct 15 ms 19248 KB Output is correct
19 Correct 12 ms 19156 KB Output is correct
20 Correct 12 ms 19156 KB Output is correct
21 Correct 9 ms 19156 KB Output is correct
22 Correct 12 ms 19156 KB Output is correct
23 Correct 11 ms 19156 KB Output is correct
24 Correct 11 ms 19156 KB Output is correct

Subtask #6
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 19028 KB Output is correct
2 Correct 10 ms 19028 KB Output is correct
3 Correct 9 ms 19028 KB Output is correct
4 Correct 9 ms 19028 KB Output is correct
5 Correct 11 ms 19156 KB Output is correct
6 Correct 9 ms 19120 KB Output is correct
7 Correct 9 ms 19028 KB Output is correct
8 Correct 10 ms 19028 KB Output is correct
9 Correct 9 ms 19028 KB Output is correct
10 Correct 11 ms 19156 KB Output is correct
11 Correct 425 ms 48720 KB Output is correct
12 Correct 510 ms 48224 KB Output is correct
13 Correct 361 ms 48856 KB Output is correct
14 Correct 341 ms 48836 KB Output is correct
15 Correct 495 ms 48988 KB Output is correct
16 Correct 12 ms 19156 KB Output is correct
17 Correct 11 ms 19132 KB Output is correct
18 Correct 11 ms 19156 KB Output is correct
19 Correct 12 ms 19156 KB Output is correct
20 Correct 12 ms 19156 KB Output is correct
21 Correct 10 ms 19156 KB Output is correct
22 Correct 13 ms 19284 KB Output is correct
23 Correct 11 ms 19156 KB Output is correct
24 Correct 12 ms 19156 KB Output is correct
25 Correct 596 ms 44460 KB Output is correct
26 Correct 121 ms 38920 KB Output is correct
27 Correct 160 ms 39076 KB Output is correct
28 Correct 504 ms 43424 KB Output is correct
29 Correct 179 ms 39768 KB Output is correct
30 Correct 180 ms 38996 KB Output is correct
31 Correct 638 ms 44916 KB Output is correct
32 Correct 172 ms 38876 KB Output is correct
33 Correct 548 ms 44424 KB Output is correct
34 Correct 12 ms 19156 KB Output is correct
35 Correct 10 ms 19156 KB Output is correct
36 Correct 12 ms 19156 KB Output is correct
37 Correct 11 ms 19156 KB Output is correct
38 Correct 10 ms 19156 KB Output is correct
39 Correct 12 ms 19156 KB Output is correct
40 Correct 11 ms 19156 KB Output is correct
41 Correct 12 ms 19156 KB Output is correct
42 Correct 12 ms 19156 KB Output is correct
43 Correct 10 ms 19156 KB Output is correct
44 Correct 12 ms 19156 KB Output is correct
45 Correct 12 ms 19156 KB Output is correct
46 Correct 10 ms 19156 KB Output is correct
47 Correct 11 ms 19156 KB Output is correct
48 Correct 10 ms 19156 KB Output is correct
49 Correct 12 ms 19156 KB Output is correct
50 Correct 12 ms 19220 KB Output is correct
51 Correct 15 ms 19248 KB Output is correct
52 Correct 12 ms 19156 KB Output is correct
53 Correct 12 ms 19156 KB Output is correct
54 Correct 9 ms 19156 KB Output is correct
55 Correct 12 ms 19156 KB Output is correct
56 Correct 11 ms 19156 KB Output is correct
57 Correct 11 ms 19156 KB Output is correct
58 Correct 639 ms 45372 KB Output is correct
59 Correct 585 ms 44176 KB Output is correct
60 Correct 641 ms 46276 KB Output is correct
61 Correct 577 ms 43820 KB Output is correct
62 Correct 119 ms 39624 KB Output is correct
63 Correct 521 ms 43076 KB Output is correct
64 Correct 187 ms 39752 KB Output is correct
65 Correct 591 ms 43752 KB Output is correct
66 Correct 631 ms 44868 KB Output is correct
67 Correct 159 ms 38580 KB Output is correct
68 Correct 523 ms 43692 KB Output is correct
69 Correct 503 ms 42948 KB Output is correct
70 Correct 168 ms 38872 KB Output is correct
71 Correct 175 ms 39496 KB Output is correct
72 Correct 176 ms 39148 KB Output is correct
73 Correct 575 ms 44884 KB Output is correct
74 Correct 162 ms 38820 KB Output is correct
75 Correct 581 ms 44028 KB Output is correct
76 Correct 607 ms 44524 KB Output is correct
77 Correct 553 ms 43692 KB Output is correct
78 Correct 179 ms 39176 KB Output is correct
79 Correct 558 ms 43796 KB Output is correct
80 Correct 177 ms 38744 KB Output is correct
81 Correct 541 ms 44052 KB Output is correct