Submission #566188

#	Time	Username	Problem	Language	Result	Execution time	Memory
566188		hollwo_pelw	Painting Walls (APIO20_paint)	C++17	100 / 100	1279 ms	262768 KiB

paint

#include "paint.h"

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

int minimumInstructions(int N, int M, int K, vector<int> C, vector<int> A, vector<vector<int>> B) {

	vector<vector<int>> pos(K), pos_ok(M);

	vector<int> ok, vis(N);

	for (int i = 0; i < M; i++) {
		for (int col : B[i])
			pos[col].push_back(i);
	}

	for (int i = 0; i < N; i++) {
		if (C[i] >= K || C[i] < 0) continue;
		for (int j : pos[C[i]])
			pos_ok[((j - i) % M + M) % M].push_back(i);
	}

	for (int i = 0; i < M; i++) {
		for (int l = 0, r = M - 1; r < (int) pos_ok[i].size(); l ++, r ++) {
			if (pos_ok[i][r] - pos_ok[i][l] + 1 == M)
				vis[pos_ok[i][l]] = 1;
		}
	}

	for (int i = 0; i < N; i++)
		if (vis[i]) ok.push_back(i);

	ok.push_back(N);

	int res = 0, p = 0;

	if (!vis[0]) return -1;

	for (int np; p < N; res ++, p = np) {
		if (p == (np = *prev(upper_bound(ok.begin(), ok.end(), p + M)))) 
			return -1;
	}

	return res;
}

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