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답안 #713472

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
713472 2023-03-22T07:51:21 Z _martynas Park (BOI16_park) C++11
100 / 100
 815 ms 40344 KB 
#include <bits/stdc++.h>

using namespace std;

using ll = long long;
using pii = pair<int, int>;
using pli = pair<ll, int>;
using pll = pair<ll, ll>;
using vi = vector<int>;
using vl = vector<ll>;

const int MOD = 1e9+7;

#define F first
#define S second
#define PB push_back
#define all(a) (a).begin(), (a).end()
#define rall(a) (a).rbegin(), (a).rend()

void FASTIO() {ios::sync_with_stdio(0); cin.tie(0); cout.tie(0); }

const int MXN = 2005;
const int MXM = 1e5+5;

int n, m;
ll w, h;
ll X[MXN], Y[MXN], R[MXN];
double dist[MXN][MXN];
vector<pii> edges;
// n - down, n+1 - right, n+2 - up, n+3 - left
double connected_at[4][4];
// dsu
int par[MXN], sz[MXN];
void init() {
    iota(par, par+n+4, 0);
    fill(sz, sz+n+4, 1);
}
int find_set(int a) {
    return par[a] == a ? a : par[a] = find_set(par[a]);
}
void unite(int a, int b) {
    a = find_set(a), b = find_set(b);
    if(a == b) return;
    if(sz[a] < sz[b]) swap(a, b);
    par[b] = a;
    sz[a] += sz[b];
}
//
int main() {
    FASTIO();
    cin >> n >> m;
    cin >> w >> h;
    for(int i = 0; i < n; i++) {
        cin >> X[i] >> Y[i] >> R[i];
    }
    for(int i = 0; i < n; i++) {
        for(int j = 0; j < i; j++) {
            dist[i][j] = sqrt(1.0*(X[i]-X[j])*(X[i]-X[j])+(Y[i]-Y[j])*(Y[i]-Y[j]))-R[i]-R[j];
            edges.PB({i, j});
        }
        dist[i][n] = Y[i] - R[i];
        dist[i][n+1] = (w - X[i]) - R[i];
        dist[i][n+2] = (h - Y[i]) - R[i];
        dist[i][n+3] = X[i] - R[i];
        edges.PB({i, n});
        edges.PB({i, n+1});
        edges.PB({i, n+2});
        edges.PB({i, n+3});
    }
    sort(all(edges), [&](pii a, pii b){
        return dist[a.F][a.S] < dist[b.F][b.S];
    });
    init();
    for(int i = 0; i < 4; i++) for(int j = 0; j < 4; j++) connected_at[i][j] = w*h;
    for(auto e : edges) {
        unite(e.F, e.S);
        double d = dist[e.F][e.S];
        for(int i = 0; i < 4; i++) for(int j = 0; j < 4; j++) {
            if(find_set(n+i) == find_set(n+j)) {
                connected_at[i][j] = min(connected_at[i][j], d);
            }
        }
    }
//    for(int i = 0; i < 4; i++) for(int j = 0; j < 4; j++) {
//        cerr << i << " " << j << ": " << fixed << setprecision(0) << connected_at[i][j] << "\n";
//    }
    for(int i = 0; i < m; i++) {
        ll r, e; cin >> r >> e; e--;
        for(int j = 0; j < 4; j++) {
            bool ok = true;
            ok &= connected_at[e][(e+3)%4]+1e-3 >= 2*r;
            ok &= connected_at[j][(j+3)%4]+1e-3 >= 2*r;
            if((j+2)%4 == e) {
                // opposite
                ok &= connected_at[j][(j+2)%4]+1e-3 >= 2*r;
                ok &= connected_at[(j+1)%4][(j+3)%4]+1e-3 >= 2*r;
            }
            else if((j+1)%4 == e) {
                ok &= connected_at[j][(j+2)%4]+1e-3 >= 2*r;
            }
            else {
                ok &= connected_at[e][(e+2)%4]+1e-3 >= 2*r;
            }
            if(j == e) ok = true;
            if(ok) {
                cout << j+1;
            }
        }
        cout << "\n";
    }
    return 0;
}

/*
5 3
16 11
11 8 1
6 10 1
7 3 2
10 4 1
15 5 1
1 1
2 2
2 1

*/

Subtask #1
27.0 / 27.0

# 결과 실행 시간 메모리 Grader output
1 Correct 700 ms 38932 KB Output is correct
2 Correct 799 ms 38980 KB Output is correct
3 Correct 727 ms 39008 KB Output is correct
4 Correct 746 ms 38928 KB Output is correct
5 Correct 815 ms 38936 KB Output is correct
6 Correct 724 ms 38932 KB Output is correct
7 Correct 458 ms 38968 KB Output is correct
8 Correct 477 ms 38928 KB Output is correct
9 Correct 0 ms 340 KB Output is correct
10 Correct 1 ms 340 KB Output is correct

Subtask #2
31.0 / 31.0

# 결과 실행 시간 메모리 Grader output
1 Correct 50 ms 2160 KB Output is correct
2 Correct 41 ms 2108 KB Output is correct
3 Correct 43 ms 2068 KB Output is correct
4 Correct 35 ms 2012 KB Output is correct
5 Correct 37 ms 2084 KB Output is correct
6 Correct 37 ms 2100 KB Output is correct
7 Correct 31 ms 636 KB Output is correct
8 Correct 32 ms 1748 KB Output is correct

Subtask #3
42.0 / 42.0

# 결과 실행 시간 메모리 Grader output
1 Correct 700 ms 38932 KB Output is correct
2 Correct 799 ms 38980 KB Output is correct
3 Correct 727 ms 39008 KB Output is correct
4 Correct 746 ms 38928 KB Output is correct
5 Correct 815 ms 38936 KB Output is correct
6 Correct 724 ms 38932 KB Output is correct
7 Correct 458 ms 38968 KB Output is correct
8 Correct 477 ms 38928 KB Output is correct
9 Correct 0 ms 340 KB Output is correct
10 Correct 1 ms 340 KB Output is correct
11 Correct 50 ms 2160 KB Output is correct
12 Correct 41 ms 2108 KB Output is correct
13 Correct 43 ms 2068 KB Output is correct
14 Correct 35 ms 2012 KB Output is correct
15 Correct 37 ms 2084 KB Output is correct
16 Correct 37 ms 2100 KB Output is correct
17 Correct 31 ms 636 KB Output is correct
18 Correct 32 ms 1748 KB Output is correct
19 Correct 777 ms 40312 KB Output is correct
20 Correct 741 ms 40232 KB Output is correct
21 Correct 751 ms 40340 KB Output is correct
22 Correct 789 ms 40328 KB Output is correct
23 Correct 752 ms 40216 KB Output is correct
24 Correct 488 ms 40344 KB Output is correct