Submission #564663

#	Time	Username	Problem	Language	Result	Execution time	Memory
564663		AbdullahMW	Building Skyscrapers (CEOI19_skyscrapers)	C++14	0 / 100	135 ms	14848 KiB

skyscrapers

#include <bits/stdc++.h>

#define all(vec) vec.begin(), vec.end()
#define ll long long
#define db double
#define pb push_back
#define pf push_front
#define newl "\n"
#define fast ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
#define f first
#define s second
#define MOD 1000000007

using namespace std;

#pragma GCC diagnostic ignored "-Wunused-result"
void setIO(string name = "") {
    ios_base::sync_with_stdio(0); cin.tie(0);
    cout << fixed << setprecision(15);
    if (name.size()) {
        freopen((name+".in").c_str(), "r", stdin);
        freopen((name+".out").c_str(), "w", stdout);
    }
}

ll c = 0;
map <pair <ll, ll>, bool> vis, exist;
unordered_map <ll, bool> occ;
void C(ll x, ll y)
{
    if (exist[{x, y}])
    {
        vis[{x, y}] = true;
        c++;
        
        if (!vis[{x + 1, y}])
        {
            C(x + 1, y);
        }
        
        if (!vis[{x - 1, y}])
        {
            C(x - 1, y);
        }
        
        if (!vis[{x, y + 1}])
        {
            C(x, y + 1);
        }
        
        if (!vis[{x, y - 1}])
        {
            C(x, y - 1);
        }
        
        /*if (!vis[{x + 1, y + 1}])
        {
            C(x + 1, y + 1);
        }
        
        if (!vis[{x + 1, y - 1}])
        {
            C(x + 1, y - 1);
        }
        
        if (!vis[{x - 1, y + 1}])
        {
            C(x - 1, y + 1);
        }
        
        if (!vis[{x - 1, y - 1}])
        {
            C(x - 1, y - 1);
        }*/
    }
}

bool cyc = 0;
void dfs(ll px, ll py, ll x, ll y)
{
    if (exist[{x, y}]) 
    {
        vis[{x, y}] = true;
        
        if (!vis[{x + 1, y}])
        {
            dfs(x, y, x + 1, y);
        }
        else if (px != x + 1 && py != y)
        {
            cyc = true;
        }
        
        if (!vis[{x - 1, y}])
        {
            dfs(x, y, x - 1, y);
        }
        else if (px != x - 1 && py != y)
        {
            cyc = true;
        }
        
        if (!vis[{x, y + 1}])
        {
            dfs(x, y, x, y + 1);
        }
        else if (px != x && py != y + 1)
        {
            cyc = true;
        }
        
        if (!vis[{x, y - 1}])
        {
            dfs(x, y, x, y - 1);
        }
        else if (px != x && py != y - 1)
        {
            cyc = true;
        }
    }
    
}


int main()
{
    //fast
    //setIO("");
    
    //freopen("filename.in", "r", stdin);
    //freopen("filename.out", "w", stdout);
    
    ll n, t; cin >> n >> t;
    vector <pair <ll, ll>> a(n);
    for (ll i = 0; i < n; i++) 
    {
        cin >> a[i].f >> a[i].s;
        exist[a[i]] = true;
    }

    C(a[0].f, a[0].s);
    //cout << newl << c << newl << newl << newl;
    if (c != n) 
    {
        cout << "NO";
        return 0;
    }
    
    vector <ll> ans;
    for (ll i = 0; i < n; i++)
    {
        if (vis.size()) vis.clear();
        cyc = 0;
        dfs(a[i].f, a[i].s, a[i].f, a[i].s);
        
        if (cyc) occ[i] = true;
    }
    
    if (ans.size() > 1) 
    {
        cout << "NO";
        return 0;
    }
    
    cout << "YES" << newl;
    for (ll i = 0; i < n; i++)
    {
        if (!occ[i]) cout << i + 1 << newl;
    }
    
    for (ll i = 0; i < n; i++)
    {
        if (occ[i]) cout << i + 1 << newl;
    }
    
    //cout << 1;



    
    
    
}

• Subtask 1: 0 / 8
• Subtask 2: 0 / 14
• Subtask 3: 0 / 12
• Subtask 4: 0 / 17
• Subtask 5: 0 / 20
• Subtask 6: 0 / 10
• Subtask 7: 0 / 19