Submission #681033

#	Time	Username	Problem	Language	Result	Execution time	Memory
681033		QwertyPi	Painting Walls (APIO20_paint)	C++14	100 / 100	822 ms	14564 KiB

paint

#include "paint.h"

#include <bits/stdc++.h>

using namespace std;

int newest[50001], streak[50001];
vector<int> contractors[100001];
bool ok[100001];
int M;
void update(int t, int x){
	x = ((x - t) % M + M) % M;
	if(newest[x] + 1 == t){
		streak[x]++;
	}else{
		streak[x] = 1;
	}
	newest[x] = t;
	if(streak[x] >= M){
		ok[t] = true;
	} 
}

int minimumInstructions(int N, int M, int K, vector<int> C, vector<int> A, vector<vector<int>> B) {
	::M = M;
	for(int i = 0; i < M; i++){
		for(int j = 0; j < A[i]; j++){
			contractors[B[i][j]].push_back(i);
		}
	}
	fill(newest, newest + 50001, -1); 
	for(int i = 0; i < N; i++){
		for(auto j : contractors[C[i]]){
			update(i, j);
		}
	}
	int ans = 0, l = 0;
	while(l < N){
		int r = min(N - 1, l + M - 1);
		while(!ok[r] && r >= l) r--;
		if(r < l) return -1l;
		l = r + 1; ans++; 
	}
	return ans;
}

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