Submission #1238749

#	Time	Username	Problem	Language	Result	Execution time	Memory
1238749		porquenomedejainiciarsesion	Mosaic (IOI24_mosaic)	C++20	29 / 100	1006 ms	2162688 KiB

mosaic

#include "mosaic.h"
#include <bits/stdc++.h>
using namespace std;
vector<vector<int>> build_prefix_sum(const vector<vector<int>>& v){
  int n=v.size();
  vector<vector<int>> p(n+1,vector<int>(n+1));
  for(int i=1;i<=n;i++){
    for(int j=1;j<=n;j++){
      p[i][j]=v[i-1][j-1]+p[i-1][j]+p[i][j-1]-p[i-1][j-1];
    }
  }
  return p;
}
int query(const vector<vector<int>>& p,int t,int b,int l,int r){
  t++,b++,l++,r++;
  return p[b][r]-p[t-1][r]-p[b][l-1]+p[t-1][l-1];
}
vector<long long> mosaic(vector<int> x,vector<int> y,vector<int> t,vector<int> b,vector<int> l,vector<int> r){
  bool ok=true;
  for(int i=0;i<t.size();i++){
    if(t[i]!=0 || b[i]!=0){
      ok=false;
    }
  }
  if(ok){
    vector<int> Px;
  Px.push_back(0);
  for(int i=0;i<x.size();i++){
    Px.push_back(Px[i]+x[i]);
  }
  vector<long long> ans;
  for(int i=0;i<t.size();i++){
    ans.push_back(Px[r[i]+1]-Px[l[i]]);
  }
  return ans;
  }
  int n=x.size();
  vector<vector<int>> v(n,vector<int>(n));
  for(int i=0;i<n;i++)v[0][i]=x[i];
  for(int i=0;i<n;i++)v[i][0]=y[i];
  for(int i=1;i<n;i++){
    for(int j=1;j<n;j++){
      v[i][j]=(v[i-1][j]==0 && v[i][j-1]==0);
    }
  }
  vector<vector<int>> p=build_prefix_sum(v);
  vector<long long> ans;
  for(int i=0;i<t.size();i++)ans.push_back(query(p,t[i],b[i],l[i],r[i]));
  return ans;
}

• Subtask 0: 0 / 0
• Subtask 1: 5 / 5
• Subtask 2: 7 / 7
• Subtask 3: 7 / 7
• Subtask 4: 10 / 10
• Subtask 5: 0 / 8
• Subtask 6: 0 / 22
• Subtask 7: 0 / 19
• Subtask 8: 0 / 22