Submission #890980

#	Time	Username	Problem	Language	Result	Execution time	Memory
890980		Muhammad_Aneeq	Pairs (IOI07_pairs)	C++17	37 / 100	4074 ms	29012 KiB

pairs

/*
بسم الله الرحمن الرحيم
Author:
                          (:Muhammad Aneeq:)
*/
#include <iostream>
#include <map>
#include <set>
#include <vector>
#include <algorithm>
using namespace std;
#define int long long
inline int dis(vector<int>&a,vector<int>&b)
{
  int z=0;
  for (int j=0;j<b.size();j++)
    z+=abs(a[j]-b[j]);
  return z;
}
inline void solve()
{
  long long B,N,D,M;
  cin>>B>>N>>D>>M;
  int a[N][B];
  vector<int>mi(B,1e9+10),ma(B,0);
  map<vector<int>,int>d;
  for (int i=0;i<N;i++)
  {
    for (int j=0;j<B;j++)
      cin>>a[i][j];
    for (int j=0;j<B;j++)
    {
      mi[j]=min(mi[j],a[i][j]);
      ma[j]=max(ma[j],a[i][j]);
    }
  }
  if (dis(mi,ma)<=D)
  {
    cout<<(N*(N-1))/2<<endl;
    return;
  }
  if (B==1)
  {
    vector<int>z;
    for (int i=0;i<N;i++)
      z.push_back(a[i][0]);
    sort(begin(z),end(z));
    int ans=0;
    for (int i=0;i<N;i++)
    {
      int x=upper_bound(begin(z),end(z),z[i]+D)-begin(z);
      ans+=x-i-1;
    }
    cout<<ans<<endl;return;
  }
  int g=1;
  for (int i=0;i<B;i++)
    g*=D;
  int ans=0;
  set<vector<int>>s;
  for (int i=0;i<N;i++)
  {
    vector<int>g;
    for (int j=0;j<B;j++)
      g.push_back(a[i][j]);
    d[g]++;
    s.insert(g);
  }
  vector<vector<int>>z={begin(s),end(s)};
  int y=z.size();
  // cout<<y<<endl;
  if (B==3)
  {
    M=min(M,D);
    for (int i=0;i<y;i++)
    {
      for (int j=max(mi[0],z[i][0]-M);j<=min(ma[0],z[i][0]+M);j++)
      {
        for (int k=max(mi[1],z[i][1]-(M-abs(z[i][0]-j)));k<=min(ma[1],z[i][1]+(M-abs(z[i][0]-j)));k++)
        {
          for (int l=max(mi[2],z[i][2]-(M-abs(z[i][0]-j)+abs(z[i][1]-k)));l<=min(ma[2],z[i][2])+(M-abs(z[i][0]-j)+abs(z[i][1]-k));l++)
          {
            if (d.find({j,k,l})==d.end())
              continue;
            vector<int>y={j,k,l};
            int di=dis(z[i],y);
            if (di<=D)
            {
              if (y==z[i])
                ans+=d[z[i]]*(d[z[i]]-1);
              else
                ans+=d[z[i]]*d[y];
            }
          }
        }
      }
    }
    cout<<ans/2<<endl;
    return;
  }
  for (int i=0;i<z.size();i++)
  {
    int g=d[z[i]];
    ans+=(g*(g-1))/2;
    for (int j=i+1;j<z.size();j++)
    {
      int di=dis(z[i],z[j]);
      if (di<=D)
        ans+=d[z[i]]*d[z[j]];
    }
  }
  cout<<ans<<endl;
}
signed main()
{
  ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
        solve();
}

Compilation message (stderr)

pairs.cpp: In function 'long long int dis(std::vector<long long int>&, std::vector<long long int>&)':
pairs.cpp:16:17: 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]
   16 |   for (int j=0;j<b.size();j++)
      |                ~^~~~~~~~~
pairs.cpp: In function 'void solve()':
pairs.cpp:101:17: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::vector<long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  101 |   for (int i=0;i<z.size();i++)
      |                ~^~~~~~~~~
pairs.cpp:105:21: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::vector<long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  105 |     for (int j=i+1;j<z.size();j++)
      |                    ~^~~~~~~~~

• Subtask 1: 6 / 6
• Subtask 2: 6 / 6
• Subtask 3: 6 / 6
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