Submission #1251278

#	Time	Username	Problem	Language	Result	Execution time	Memory
1251278		guymmk	Triple Peaks (IOI25_triples)	C++20	8 / 100	2117 ms	486400 KiB

triples

// Source: https://usaco.guide/general/io

#include <bits/stdc++.h>
#include "triples.h"
using namespace std;
vector<int> v;
int n;
map<vector<int>,int>mp;
int is_triple(vector<int>g){
  sort(g.begin(),g.end());
  if(mp[g]||(g[0]==g[1]||g[0]==g[2]||g[1]==g[2])||g[0]<0||g[2]>=n)return 0;
  mp[g]++;
  vector<int>a,b;
  a={g[1]-g[0],g[2]-g[0],g[2]-g[1]};
  b={v[g[0]],v[g[1]],v[g[2]]};
  sort(a.begin(),a.end());
  sort(b.begin(),b.end());
  return (int)(a==b);
}
long long count_triples(vector<int> hsh) {
    v=hsh;
    int ans=0;
    n=v.size();
    for(int i=0;i<n;i++){
        for(int j=i+1;j<n;j++){
              ans+=is_triple({i,j,i+v[i]});
              ans+=is_triple({i,j,j+v[i]});
              ans+=is_triple({i,j,i+v[j]});
              ans+=is_triple({i,j,j+v[j]});
              ans+=is_triple({i,j,i-v[i]});
              ans+=is_triple({i,j,j-v[i]});
              ans+=is_triple({i,j,i-v[j]});
              ans+=is_triple({i,j,j-v[j]});
             
            
        }
    }return ans;
}

vector<int> construct_range(int M, int K) {
  vector<int>pred;
  int mx=0,cnt=200;
  srand(time(0));
  while(mx<K&&cnt--){
    vector<int>idk(M);
    for(auto& i:idk){
      i=rand()%(M-1)+1;
    }
    int f=count_triples(idk);
    if(f>mx){
      mx=f;
      pred=idk;
    }
  }return pred;
  
}

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