Submission #1226488

#	Time	Username	Problem	Language	Result	Execution time	Memory
1226488		dzuizz	Painting Walls (APIO20_paint)	C++20	40 / 100	1595 ms	26696 KiB

paint

#include <bits/stdc++.h>
#include "paint.h"
using namespace std;

constexpr int N=1e5,M=5e4,K=1e5;
map<int,int> dp[2];
unordered_set<int> mp[K];
int ans;
bool can[N];

int minimumInstructions(int n,int m,int k,vector<int>c,vector<int>a,vector<vector<int>>b) {
  for(int i=0;i<m;++i) for(int j=0;j<a[i];++j)
    mp[b[i][j]].insert(i);

  for(int i=n-1;i>=0;--i){
    dp[i&1].clear();
    for(auto&j:mp[c[i]]){
      dp[i&1][j]=dp[i&1^1][(j+1)%m]+1;
      can[i]=can[i]||(dp[i&1][j]>=m);
    }
  }

  for(int i=0,p=-1,q=-1;i<n;++i){
    q=(can[i]?i+m-1:q);
    if(i>p) p=q,++ans;
    if(i>p) return -1;
  }
  return ans;
}

• Subtask 1: 12 / 12
• Subtask 2: 15 / 15
• Subtask 3: 13 / 13
• Subtask 4: 0 / 23
• Subtask 5: 0 / 37