Submission #387397

#	Time	Username	Problem	Language	Result	Execution time	Memory
387397		talant117408	Painting Walls (APIO20_paint)	C++17	100 / 100	417 ms	14316 KiB

paint

#include "paint.h"
#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef pair <int, int> pii;
typedef pair <ll, ll> pll;

#define sz(v) (int)v.size()
#define pb push_back
#define mp make_pair
#define all(v) v.begin(), v.end()

const int MAXN = 1e5+7;
int n, m, k;
int color[MAXN], can[MAXN], L[MAXN];
pii last[2][MAXN];
vector <int> isLikedBy[MAXN];

int g(int i) {
	if (i >= n) return 0;
	else if (i - L[i] >= m) return 1e9;
	return 1+g(L[i]+m);
}

int minimumInstructions(int N, int M, int K, vector<int> C, vector<int> A, vector<vector<int>> B) {
	n = N; m = M; k = K;
	for (int i = 0; i < n; i++) color[i] = C[i];
	for (int i = 0; i < m; i++) {
		for (auto to : B[i]) {
			isLikedBy[to].pb(i);
		}
	}
	for (int i = n-1; i >= 0; i--) {
		int type = (i & 1 ? 1 : 0);
		for (int j = sz(isLikedBy[color[i]])-1; j >= 0; j--) {
			auto worker = isLikedBy[color[i]][j];
			if (i == n-1) {
				last[type][worker] = mp(i, i);
			}
			else {
				if (last[type^1][(worker+1)%m].first != i+1) {
					last[type][worker] = mp(i, i);
				}
				else {
					last[type][worker] = mp(i, last[type^1][(worker+1)%m].second);
				}
			}
		}
		for (auto worker : isLikedBy[color[i]]) {
			if (last[type][worker].second-i >= m-1) {
				can[i] = 1;
			}
		}
	}

	int prev = -1e9;
	for (int i = 0; i < n; i++) {
		if (can[i]) prev = i;
		L[i] = prev;
	}
	
	auto ans = g(0);
	return (ans >= 1e8 ? -1 : ans);
}

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