Submission #391938

#	Time	Username	Problem	Language	Result	Execution time	Memory
391938		MrDomino	Painting Walls (APIO20_paint)	C++14	28 / 100	1593 ms	18372 KiB

paint

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

using namespace std;

int sum(int a, int b) {
  return a * b;
}

const int INF = (int) 1e9;

int minimumInstructions(int n, int m, int k, vector<int> c, vector<int> a, vector<vector<int>> b) {
  vector<int> can(n, 0);
  vector<set<int>> match(m);
  vector<vector<int>> guys(k);
  for (int i = 0; i < m; i++) {
    for (auto &j : b[i]) {
      match[i].insert(j);
      guys[j].push_back(i);
    }
  }
  deque<int> dq;
  for (int i = 0; i + m - 1 < n; i++) {
    /// can[i] = 1?
    /// de la i la i + m - 1 imi pasa de cel cu dimensiunea minima
    while (!dq.empty() && dq.front() < i) {
      dq.pop_front();
    }
    if (i == 0) {
      for (int j = 0; j < m; j++) {
        while (!dq.empty() && (int) guys[c[j]].size() <= (int) guys[c[dq.back()]].size()) {
          dq.pop_back();
        }
        dq.push_back(j);
      }
    } else {
      int j = i + m - 1;
      while (!dq.empty() && (int) guys[c[j]].size() <= (int) guys[c[dq.back()]].size()) {
        dq.pop_back();
      }
      dq.push_back(j);
    }
    int raz = dq.front() - i;
    for (auto &val : guys[c[i + raz]]) {
      int x = (val - raz + m) % m;
      assert(x >= 0);
      bool good = 1;
      for (int l = 0; l < m; l++) {
        if (!match[(x + l) % m].count(c[i + l])) {
          good = 0;
          break;
        }
      }
      if (good) {
        can[i] = 1;
        break;
      }
    }
  }
  { /// shift can by 1
    reverse(can.begin(), can.end());
    can.push_back(0);
    reverse(can.begin(), can.end());
  }
  vector<int> dp(n + 1, INF);
  dp[0] = 0;
  dq.clear();
  dq.push_back(0);
  for (int i = m; i <= n; i++) {
    /// finish at position i => I've started at position i-k+1
    int start = i - m + 1;
    if (!can[start]) {
      continue;
    }
    while (!dq.empty() && dq.front() < start - 1) {
      dq.pop_front();
    }
    while (!dq.empty() && dp[i] <= dp[dq.back()]) {
      dq.pop_back();
    }
    if (!dq.empty()) {
      dp[i] = dp[dq.front()] + 1;
    }
    dq.push_back(i);
  }
  if (dp[n] == INF) {
    dp[n] = -1;
  }
  return dp[n];
}

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