Submission #708654

#	Time	Username	Problem	Language	Result	Execution time	Memory
708654		cig32	Pairs (IOI07_pairs)	C++17	40 / 100	4059 ms	257028 KiB

pairs

#include "bits/stdc++.h"
#include <ext/pb_ds/assoc_container.hpp> // Common file
#include <ext/pb_ds/tree_policy.hpp> // Including tree_order_statistics_node_update
#include <ext/pb_ds/detail/standard_policies.hpp>
using namespace std;
#define int long long
using namespace __gnu_pbds;
typedef tree<pair<pair<int,int>,int>,null_type,less<pair<pair<int,int>,int> >,rb_tree_tag,tree_order_statistics_node_update>ordered_set;
const int MAXN = 2e5 + 10;
const int MOD = 1e9 + 7;
mt19937_64 rng((int)std::chrono::steady_clock::now().time_since_epoch().count());
int rnd(int x, int y) {
  int u = uniform_int_distribution<int>(x, y)(rng); return u;
}
int bm(int b, int p) {
  if(p==0) return 1 % MOD;
  int r = bm(b, p >> 1);
  if(p&1) return (((r*r) % MOD) * b) % MOD;
  return (r*r) % MOD;
}
int inv(int b) { 
  return bm(b, MOD-2);
}
int fastlog(int x) {
  return (x == 0 ? -1 : 64 - __builtin_clzll(x) - 1);
}
void printcase(int i) { cout << "Case #" << i << ": "; }

ordered_set bit[75010]; // 2D bit in regular matrices but only supporting single add/del
int id = 0;
map<pair<int, int>, queue<int> > mp;
void insert(int x, int y) {
  id++;
  mp[{y, x}].push(id);
  for(;x<75010;x+=x&-x) bit[x].insert({{y, x}, id});
}
void erase(int x, int y) {
  int ono = mp[{y, x}].front(); mp[{y, x}].pop();
  for(;x<75010;x+=x&-x) bit[x].erase({{y, x}, ono});
}
int query(int x, int y) {
  int sum = 0;
  for(;x;x-=x&-x) sum += bit[x].order_of_key({{y+1, 0}, 0});
  return sum;
}
bool cmp1(pair<int, int> x, pair<int, int> y) {
  return x.first - x.second < y.first - y.second;
}
bool cmp2(pair<int, int> x, pair<int, int> y) {
  return x.first + x.second < y.first + y.second;
}
void solve(int tc) {
  int b, n, d, m;
  cin >> b >> n >> d >> m;
  if(b == 1) {
    int a[n+1];
    for(int i=1; i<=n; i++) cin >> a[i];
    sort(a+1, a+1+n);
    int ans = 0;
    for(int i=1; i<n; i++) {
      int lb = i+1, rb = n;
      while(lb < rb) {
        int mid = (lb + rb + 1) >> 1;
        if(a[mid] - a[i] <= d) lb = mid;
        else rb = mid - 1;
      }
      if(a[lb] - a[i] <= d) ans += lb - i;
    }
    cout << ans << "\n";
    return;
  }
  if(b == 2) {
    int ans = 0;
    pair<int, int> p[n+1];
    for(int i=1; i<=n; i++) {
      cin >> p[i].first >> p[i].second;
    }
    sort(p+1, p+1+n, cmp1);
    for(int i=1; i<=n; i++) {
      ans += query(p[i].first, 75001-p[i].second);
      insert(p[i].first, 75001-p[i].second);
    }
    for(int i=1; i<=n; i++) erase(p[i].first, 75001-p[i].second);
    sort(p+1, p+1+n, cmp2);
    for(int i=1; i<=n; i++) {
      ans += query(p[i].first, p[i].second);
      insert(p[i].first, p[i].second);
    }
    vector<int> c[75001];
    for(int i=1; i<=n; i++) c[p[i].second].push_back(p[i].first);
    for(int i=1; i<=75000; i++) sort(c[i].begin(), c[i].end());
    for(int i=1; i<=75000; i++) {
      for(int j=0; j+1<c[i].size(); j++) {
        int lb = j+1, rb = c[i].size() - 1;
        while(lb < rb) {
          int mid = (lb + rb + 1) >> 1;
          if(c[i][mid] - c[i][j] <= d) lb = mid;
          else rb = mid-1;
        }
        if(c[i][lb] - c[i][j] <= d) ans -= (lb - j);
      }
    }
    cout << ans << "\n"; return;
  }
  if(b == 3) {
    int x[n+1], y[n+1], z[n+1];
    for(int i=1; i<=n; i++) cin >> x[i] >> y[i] >> z[i];
    int ans = 0;
    for(int i=1; i<=n; i++) for(int j=i+1; j<=n; j++) ans += (abs(x[i] - x[j]) + abs(y[i] - y[j]) + abs(z[i] - z[j]) <= d);
    cout << ans << "\n"; return;
  }
}

int32_t main() {
  ios::sync_with_stdio(0); cin.tie(0);
  int t = 1; //cin >> t;
  for(int i=1; i<=t; i++) solve(i);
}

Compilation message (stderr)

pairs.cpp: In function 'void solve(long long int)':
pairs.cpp:93:23: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   93 |       for(int j=0; j+1<c[i].size(); j++) {
      |                    ~~~^~~~~~~~~~~~

• Subtask 1: 6 / 6
• Subtask 2: 6 / 6
• Subtask 3: 6 / 6
• Subtask 4: 6 / 6
• Subtask 5: 6 / 6
• Subtask 6: 0 / 7
• Subtask 7: 0 / 7
• Subtask 8: 0 / 8
• Subtask 9: 0 / 8
• Subtask 10: 10 / 10
• Subtask 11: 0 / 10
• Subtask 12: 0 / 10
• Subtask 13: 0 / 10