Submission #500934

#	Time	Username	Problem	Language	Result	Execution time	Memory
500934		sidon	Painting Walls (APIO20_paint)	C++17	100 / 100	537 ms	15008 KiB

paint

#include <bits/stdc++.h>
using namespace std;
#define V vector<int>

int minimumInstructions(int N, int M, int K, V C, V A, vector<V> B) {
	V g[K], x(M), y(M), dp(N+1);
	int ans = 0, i = M, j;

	while(--i >= 0)
		for(int &s : B[i]) g[s].push_back(i);

	for(i = N; --i >= 0; x.swap(y)) {
		if(i+2 < N)
			for(int s : g[C[i+2]]) x[s] = 0;
		for(int s : g[C[i]]) 
			if((x[s] = 1 + y[(s + 1) % M]) >= M) dp[i] = 1;
	}

	for(dp[N] = dp[i=0]; i < N; i = j, ans++) {
		for(j = min(N, i+M); j > i && !dp[j]; --j);
		if(i == j) return -1;
	}

	return ans;
}

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