Submission #217167

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
217167	2020-03-29 07:13:00	rama_pang	별자리 3 (JOI20_constellation3)	C++14	100 / 100	667 ms	45696 KiB

constellation3

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#include <bits/stdc++.h>
using namespace std;
class Dyanmic_Programming { // O(N^2) DP solution
 
 private:
  int N, M;
  int A[2005], X[2005], Y[2005], C[2005];
  long long DP[2005][2005]; // DP[height][column] = DP with domain(height, column) if we are forced to pick cell (heigth, column).
  int Star[2005][2005];
  void init() {
    for (int i = 0; i < M; i++) {
      for (int height = Y[i]; height <= N + 1; height++) {
        Star[height][X[i]] = max(Star[height][X[i]], C[i]);
      }
    }
  }
 
 public:
  long long solve() {
    init();
    for (int height = 1; height <= N + 1; height++) { // height N + 1 to merge all components into one
      for (int left = 1, right = left; left <= N; left = (++right)) {
        if (A[left] >= height) continue; // this cell is still occupied by a building (white cell).
        while (right + 1 <= N && A[right + 1] < height) {
 
 
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Compilation message (stderr)

constellation3.cpp: In member function 'std::vector<std::vector<std::pair<int, int> > > Constellation::CalculateStarDifference()':
constellation3.cpp:212:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
       for (int j = 1; j < stars_per_column[i].size(); j++) {
                       ~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
constellation3.cpp:218:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
       for (int j = 0; j < stars_per_column[i].size(); j++) {
                       ~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
constellation3.cpp: In member function 'long long int Constellation::solve()':
constellation3.cpp:338:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for (; ptr < LR_bounds_old.size(); ptr++) {
                ~~~~^~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 14 / 14
• Subtask 2: 21 / 21
• Subtask 3: 65 / 65