Submission #564582

#	Time	Username	Problem	Language	Result	Execution time	Memory
564582		AbdullahMW	Building Skyscrapers (CEOI19_skyscrapers)	C++14	0 / 100	3578 ms	1108 KiB

skyscrapers

#include <bits/stdc++.h>

#define all(vec) vec.begin(), vec.end()
#define ll int
#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);
    }
}

map <pair <ll, ll>, bool> occ;
map <ll, vector <ll>> fx, fy;
bool C(ll x, ll y)
{
    if (occ[{x + 1, y}]) return 1;
    else if (occ[{x - 1, y}]) return 1;
    else if (occ[{x, y + 1}]) return 1;
    else if (occ[{x, y - 1}]) return 1;
    
    if (occ[{x + 1, y + 1}]) return 1;
    else if (occ[{x + 1, y - 1}]) return 1;
    else if (occ[{x - 1, y + 1}]) return 1;
    else if (occ[{x - 1, y - 1}]) return 1;
    
    return 0;
}

bool cyc;
map <ll, map <ll, bool>> vis;
void dfs(ll px, ll py, ll x, ll y)
{
    if (occ[{x + 1, y}])
    {
        if (!vis[x + 1][y]) 
        {
            vis[x + 1][y] = true;
            dfs(x, y, x + 1, y);
        }
        else if (px != x + 1 && py != y) cyc = true;
    }
    
    if (occ[{x - 1, y}])
    {
        if (!vis[x - 1][y]) 
        {
            vis[x - 1][y] = true;
            dfs(x, y, x - 1, y);
        }
        else if (px != x - 1 && py != y) cyc = true;
    }
    
    if (occ[{x, y + 1}])
    {
        if (!vis[x][y + 1]) 
        {
            vis[x][y + 1] = true;
            dfs(x, y, x, y + 1);
        }
        else if (px != x && py != y + 1) cyc = true;
    }
    
    if (occ[{x, y - 1}])
    {
        if (!vis[x][y - 1]) 
        {
            vis[x][y - 1] = true;
            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>> vec(n);
    vector <ll> per(n);
    for (ll i = 0; i < n; i++) 
    {
        cin >> vec[i].f >> vec[i].s;
        per[i] = i;
    }
    
    if (n == 1) 
    {
        cout << "YES" << newl << 1;
        return 0;
    }
    
    do
    {
        if (occ.size()) occ.clear();
        if (fx.size()) fx.clear();
        if (fy.size()) fy.clear();
        
        bool works = true;
        
        ll c = 0;
        for (auto idx : per)
        {
            cyc = 0;
            if (vis.size()) vis.clear();
            
            ll x = vec[idx].f, y = vec[idx].s;
            c++;
            occ[vec[idx]] = true;
            fx[x].pb(y);
            fy[y].pb(x);
            
            if (!C(x, y) && c != 1)
            {
                works = false;
                break;
            }
            
            
            ll yy = upper_bound(all(fx[x]), y) - fx[x].begin();
            ll xx = upper_bound(all(fy[y]), x) - fy[y].begin();
            if (yy != fx[x].size()) dfs(x, fx[x][yy], x, fx[x][yy]);
            else if (xx != fy[y].size()) dfs(fy[y][xx], y, fy[y][xx], y);
            
            
            if (cyc) 
            {
                works = false;
                break;
            }
            
            
        }
        
        if (works) 
        {
            cout << "YES" << newl;
            for (auto v : per) cout << v + 1 << newl;
            return 0;
        }
        
    } while(next_permutation(all(per)));
    
    cout << "NO";
}
    

Compilation message (stderr)

skyscrapers.cpp: In function 'int main()':
skyscrapers.cpp:142:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  142 |             if (yy != fx[x].size()) dfs(x, fx[x][yy], x, fx[x][yy]);
      |                 ~~~^~~~~~~~~~~~~~~
skyscrapers.cpp:143:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  143 |             else if (xx != fy[y].size()) dfs(fy[y][xx], y, fy[y][xx], y);
      |                      ~~~^~~~~~~~~~~~~~~

• 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