Submission #1084086

#	Time	Username	Problem	Language	Result	Execution time	Memory
1084086		Mighilon	Naval battle (CEOI24_battle)	C++17	0 / 100	410 ms	30152 KiB

Main

#include <bits/stdc++.h>
using namespace std;

#ifdef DEBUG
#include "../Library/debug.h"
#else
#define dbg(x...)
#endif

typedef long long ll;
typedef long double ld;
typedef pair<int, int> pi;
typedef pair<ll, ll> pl;
typedef vector<int> vi;
typedef vector<ll> vl;
typedef vector<pi> vpi;
typedef vector<pl> vpl;

#define FOR(i, a, b) for (int i = (a); i < (b); ++i)
#define F0R(i, a) for (int i = 0; i < (a); ++i)
#define FORd(i, a, b) for (int i = (b) - 1; i >= (a); --i)
#define F0Rd(i, a) for (int i = (a) - 1; i >= 0; --i)
#define trav(a, x) for (auto& a : x)
#define f first
#define s second
#define pb push_back
#define sz(x) (int)(x).size()
#define all(x) x.begin(), x.end()

const char nl = '\n';
const int INF = 1e9;
const int MOD = 1e9 + 7;

struct point{
    int x, y, d;
};

vector<point> p;
int n;

int distance(point a, point b){
    return abs(a.y - b.y) + abs(a.x - b.x);
}
int distance(pi a){
    return distance(p[a.f], p[a.s]);
}

vpi diagonal_compute(int l, int r, int x){
    map<int, vi> mp;
    dbg(l, r, x)
    F0R(i, n){
        if(p[i].d == l || p[i].d == r){
            dbg(i)
            mp[p[i].x + p[i].y * x].pb(i);
        }
    }
    trav(k, mp){
        sort(all(k.s), [&](int i, int j){return (p[i].x - p[i].y * x) * (x == -1 ? -1 : 1) < p[j].x - p[j].y * x;});
        dbg(k.s)
    }
    vpi ans;
    trav(i, mp){
        stack<int> st;
        trav(j, i.s){
            if(p[j].d == l)
                st.push(j);
            else if(!st.empty()){
                dbg(1)
                ans.pb({st.top(), j});
                st.pop();
            }
        }
    }
    dbg(ans)
    return ans;
}

vpi front_front(){
    vpi ans;
    {
        map<int, vi> mp;
        F0R(i, n){
            if(p[i].d == 0 || p[i].d == 2){
                mp[p[i].x].pb(i);
            }
        }
        trav(i, mp){
            sort(all(i.s), [&](int a, int b){return p[a].y < p[b].y;});
            stack<int> st;
            trav(j, i.s){
                if(p[j].d == 0)
                    st.push(j);
                else if(!st.empty()){
                    ans.pb({st.top(), j});
                    st.pop();
                }
            }
        }
    }
    {
        map<int, vi> mp;
        F0R(i, n){
            if(p[i].d == 1 || p[i].d == 3){
                mp[p[i].y].pb(i);
            }
        }
        trav(i, mp){
            sort(all(i.s), [&](int a, int b){return p[a].x < p[b].x;});
            stack<int> st;
            trav(j, i.s){
                if(p[j].d == 3)
                    st.push(j);
                else if(!st.empty()){
                    ans.pb({st.top(), j});
                    st.pop();
                }
            }
        }
    }
    dbg(ans)
    return ans;
}

void solve(){
    cin >> n;
    p.resize(n);
    F0R(i, n){
        char c;
        cin >> p[i].x >> p[i].y >> c;
        if(c == 'S') p[i].d = 0;
        else if(c == 'W') p[i].d = 1;
        else if(c == 'N') p[i].d = 2;
        else p[i].d = 3;
    }
    auto comp = [&](pi a, pi b){return distance(a) < distance(b);};
    priority_queue<pi, vector<pi>, decltype(comp)> pq(comp);
    F0R(i, 4){
        vpi x = diagonal_compute(i, (i + 1) % 4, i % 2 == 0 ? -1 : 1);
        dbg(x)
        trav(j, x)
            pq.push(j);
    }
    vpi x = front_front();
    dbg(x)
    trav(j, x)
        pq.push(j);
    vi dist(n, -1);
    while(!pq.empty()){
        auto [i, j] = pq.top();
        dbg(i, j)
        pq.pop();
        int d = distance({i, j});
        if((dist[i] == -1 || dist[i] == d) && (dist[j] == -1 || dist[j] == d)){
            dist[i] = d;
            dist[j] = d;
        }
    }
    F0R(i, n)
        if(dist[i] == -1)
            cout << i + 1 << nl;

}

int32_t main(){
    ios::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);

    int TC = 1;
    // cin >> TC;
    while(TC--){
        solve();
    }
    return 0;
}

• Subtask 0: 0 / 0
• Subtask 1: 0 / 6
• Subtask 2: 0 / 12
• Subtask 3: 0 / 8
• Subtask 4: 0 / 11
• Subtask 5: 0 / 9
• Subtask 6: 0 / 30
• Subtask 7: 0 / 24