Submission #777239

#	Time	Username	Problem	Language	Result	Execution time	Memory
777239		Sam_a17	Circle selection (APIO18_circle_selection)	C++17	23 / 100	1235 ms	50488 KiB

circle_selection

#define _CRT_SECURE_NO_WARNINGS
#include <bits/stdc++.h>
//#include "temp.cpp"
#include <cstdio>
using namespace std;
 
#ifndef ONLINE_JUDGE
#define dbg(x) cerr << #x <<" "; print(x); cerr << endl;
#else
#define dbg(x)
#endif
 
#define sz(x) (int)x.size()
#define len(x) (int)x.length()
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define clr(x) (x).clear()
#define uniq(x) x.resize(unique(all(x)) - x.begin());
#define blt __builtin_popcount
 
#define pb push_back
#define popf pop_front
#define popb pop_back
#define ld long double
#define ll long long
 
void print(long long t) {cerr << t;}
void print(int t) {cerr << t;}
void print(string t) {cerr << t;}
void print(char t) {cerr << t;}
void print(double t) {cerr << t;}
void print(long double t) {cerr << t;}
void print(unsigned long long t) {cerr << t;}
 
#include <ext/pb_ds/assoc_container.hpp>
using namespace __gnu_pbds;
#define nl '\n'
 
// Indexed Set  
template <class T> using Tree = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
 
template <class T, class V> void print(pair <T, V> p);
template <class T> void print(vector <T> v);
template <class T> void print(set <T> v);
template <class T, class V> void print(map <T, V> v);
template <class T> void print(multiset <T> v);
template <class T, class V> void print(T v[],V n) {cerr << "["; for(int i = 0; i < n; i++) {print(v[i]); cerr << " "; } cerr << "]";}
template <class T, class V> void print(pair <T, V> p) {cerr << "{"; print(p.first); cerr << ","; print(p.second); cerr << "}";}
template <class T> void print(vector <T> v) {cerr << "[ "; for (T i : v) {print(i); cerr << " ";} cerr << "]";}
// template <class T> void print(vector <T> v) {cerr << "[ "; for (T i : v) {print(i); cerr << " ";} cerr << "]";}
template <class T> void print(set <T> v) {cerr << "[ "; for (T i : v) {print(i); cerr << " ";} cerr << "]";}
template <class T> void print(multiset <T> v) {cerr << "[ "; for (T i : v) {print(i); cerr << " ";} cerr << "]";}
template <class T> void print(Tree <T> v) {cerr << "[ "; for (T i : v) {print(i); cerr << " ";} cerr << "]";}
template <class T, class V> void print(map <T, V> v) {cerr << "[ "; for (auto i : v) {print(i); cerr << " ";} cerr << "]";}
template <class T> void print(deque <T> v) {cerr << "[ "; for (T i : v) {print(i); cerr << " ";} cerr << "]";}
 
 
// for random generations
mt19937 myrand(chrono::steady_clock::now().time_since_epoch().count());
// mt19937 myrand(131);
 
// for grid problems
int dx[8] = {-1,0,1,0,1,-1,1,-1};
int dy[8] = {0,1,0,-1,1,1,-1,-1};
 
// lowest / (1 << 17) >= 1e5 / (1 << 18) >= 2e5 / (1 << 21) >= 1e6
void fastIO() {
  ios_base::sync_with_stdio(false);
  cin.tie(nullptr); cout.tie(nullptr);
}
// file in/out
void setIO(string str = "") {
  fastIO();
 
  // if(str == "input") {
    // freopen("input.txt", "r", stdin);
    // freopen("output.txt", "w", stdout);
  // } else if(str != "") {
    // freopen((str + ".in").c_str(), "r", stdin);
    // freopen((str + ".out").c_str(), "w", stdout);
  // }
}
 
const long long inf = 1e9 + 1;
int n;
 
long long dist(pair<long long, long long> a, pair<long long, long long> b) {
  return abs(a.first - b.first) * abs(a.first - b.first) + abs(a.second - b.second) * abs(a.second - b.second);
}
 
struct node {
  long long x, y, r;
  int index;
};

map<pair<long long, long long>, vector<node>> mp;

bool cmp(node a, node b) {
  if(a.r > b.r) {
    return true;
  } else {
    if(a.index < b.index) {
      return true;
    } else {
      return false;
    }
  }
}
 
void solve_() {
  cin >> n;
 
  vector<node> a;
  long long cur_r, cur;
  for(int i = 1; i <= n; i++) {
    long long x, y, r; cin >> x >> y >> r;
    x += inf, y += inf;
    a.push_back({x, y, r, i});
  }

  sort(all(a), cmp);
 
  vector<int> which(n + 1);
  long long mx = -1;
  
  for(int w = 0; w < n; w++) {
    int ind = a[w].index;
    if(which[ind]) continue;
    if(mx == -1) {
      mx = a[w].r;
      mp.clear();
      mx = max(mx, 1ll);

      for(int i = 0; i < n; i++) {
        if(which[a[i].index]) {
          continue;
        }
        long long cx = a[i].x / mx;
        long long cy = a[i].y / mx;
        mp[{cx, cy}].push_back(a[i]);
      }
    }

    long long cur_x = a[w].x / mx;
    long long cur_y = a[w].y / mx;

    for(int i = cur_x - 2; i <= cur_x + 2; i++) {
      for(int j = cur_y - 2; j <= cur_y + 2; j++) {
        if(mp.find({i, j}) == mp.end()) continue;

        for(auto k: mp[{i, j}]) {
          if(which[k.index]) continue;
          
          if(dist({a[w].x, a[w].y}, {k.x, k.y}) <= (a[w].r + k.r) * (a[w].r + k.r)) {
            which[k.index] = ind;
          }
        }
      }
    }

  }

  for(int i = 1; i <= n; i++) {
    assert(which[i]);
    cout << which[i] << " ";
  }
  cout << '\n';
}
 
int main() {
  setIO();
 
  auto solve = [&](int test_case)-> void {
    for(int i = 1; i <= test_case; i++) {
      solve_();
    }
  };
 
  int test_cases = 1;
  // cin >> test_cases;
  solve(test_cases);
 
  return 0;
} 

Compilation message (stderr)

circle_selection.cpp: In function 'void solve_()':
circle_selection.cpp:114:13: warning: unused variable 'cur_r' [-Wunused-variable]
  114 |   long long cur_r, cur;
      |             ^~~~~
circle_selection.cpp:114:20: warning: unused variable 'cur' [-Wunused-variable]
  114 |   long long cur_r, cur;
      |                    ^~~

• Subtask 1: 0 / 7
• Subtask 2: 0 / 12
• Subtask 3: 0 / 15
• Subtask 4: 23 / 23
• Subtask 5: 0 / 30
• Subtask 6: 0 / 13