oj.uz

Submission #635910

# Submission time Handle Problem Language Result Execution time Memory
635910 2022-08-27T11:14:29 Z slime Catfish Farm (IOI22_fish) C++17
9 / 100
 477 ms 100228 KB 
#include "fish.h"
#include "bits/stdc++.h"


#include <vector>

using namespace std;


vector<pair<int, long long> > cs[100010];

long long columnSum(int i, int R) {
  if(R < 0) return 0;
  if(cs[i].empty()) return 0;
  int lb = 0, rb = cs[i].size() - 1;
  while(lb < rb) {
    int mid = (lb + rb + 1) >> 1;
    if(cs[i][mid].first <= R) lb = mid;
    else rb = mid - 1;
  }
  if(cs[i][lb].first <= R) return cs[i][lb].second;
  else return 0;
}


vector<int> possible_heights[100010];


long long max_weights(int N, int M, std::vector<int> X, std::vector<int> Y, std::vector<int> W) {

  for(int i=0; i<M; i++) {
    cs[X[i]].push_back({Y[i], W[i]});
    possible_heights[X[i]].push_back(Y[i]);
  }

  for(int i=0; i<N; i++) {
    possible_heights[i].push_back(0);
    possible_heights[i].push_back(N);
  }

  for(int i=0; i<N; i++) {
    sort(possible_heights[i].begin(), possible_heights[i].end());
  }

  for(int i=0; i<N; i++) sort(cs[i].begin(), cs[i].end());

  for(int i=0; i<N; i++) {
    for(int j=1; j<cs[i].size(); j++) {
      cs[i][j].second += cs[i][j-1].second;
    }
  }


  unordered_map<int, long long> DP[N][2];//0-> upwards, 1->downwards or plains

  for(int i=1; i<N; i++) {
    // State = 0: upwards (H[i-1] < H[i])
    {
      // H[i-1] > 0

      long long ptr = -1, qq = 0;
      for(int x: possible_heights[i]) {
        while(ptr + 1 < possible_heights[i-1].size() && possible_heights[i-1][ptr + 1] < x) {
          ptr++;
          int hh = possible_heights[i-1][ptr];
          if(hh > 0 || i == 1) qq = max(qq, DP[i-1][0][hh] - columnSum(i-1, hh-1)); // If i = 1, hh = 0 is ok
        }
        DP[i][0][x] = max(DP[i][0][x], qq + columnSum(i-1, x-1));
      }
      // H[i-1] = 0
      if(i > 1) {
        // y 0 x, y < x
        ptr = -1, qq = 0;
        for(int x: possible_heights[i]) {
          while(ptr + 1 < possible_heights[i-2].size() && possible_heights[i-2][ptr + 1] < x) {
            ptr++;
            int hh = possible_heights[i-2][ptr];
            long long vv = max(DP[i-2][0][hh], DP[i-2][1][hh]);
            qq = max(qq, vv);
          }
          DP[i][0][x] = max(DP[i][0][x], qq + columnSum(i-1, x-1));
        }
        // y 0 x, y > x
        ptr = possible_heights[i-2].size(), qq = 0;
        reverse(possible_heights[i].begin(), possible_heights[i].end());
        for(int x: possible_heights[i]) {
          while(ptr - 1 >= 0 && possible_heights[i-2][ptr - 1] > x) {
            ptr--;
            int hh = possible_heights[i-2][ptr];
            long long vv = max(DP[i-2][0][hh], DP[i-2][1][hh]);
            qq = max(qq, vv + columnSum(i-1, hh-1));
          }
          DP[i][0][x] = max(DP[i][0][x], qq);
        }
        reverse(possible_heights[i].begin(), possible_heights[i].end());
      }
    }
    // State = 1: downwards (H[i-1] >= H[i])
    {
      reverse(possible_heights[i].begin(), possible_heights[i].end());
      long long ptr = possible_heights[i-1].size(), qq = 0;
      for(int x: possible_heights[i]) {
        while(ptr - 1 >= 0 && possible_heights[i-1][ptr - 1] >= x) {
          ptr--;
          int hh = possible_heights[i-1][ptr];
          qq = max(qq, max(DP[i-1][0][hh], DP[i-1][1][hh]) + columnSum(i, hh-1));
        }
        DP[i][1][x] = max(DP[i][1][x], qq - columnSum(i, x-1));
      }
      reverse(possible_heights[i].begin(), possible_heights[i].end());
    }

    for(int x: possible_heights[i]) {
      DP[i][0][x] = max(DP[i][0][x], 0ll);
      DP[i][1][x] = max(DP[i][1][x], 0ll);
    }
  }

  long long ans = 0;
  for(int x: possible_heights[N-1]) ans = max(ans, max(DP[N-1][0][x], DP[N-1][1][x]));
  return ans;
}

Compilation message

fish.cpp: In function 'long long int max_weights(int, int, std::vector<int>, std::vector<int>, std::vector<int>)':
fish.cpp:48:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   48 |     for(int j=1; j<cs[i].size(); j++) {
      |                  ~^~~~~~~~~~~~~
fish.cpp:63:23: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   63 |         while(ptr + 1 < possible_heights[i-1].size() && possible_heights[i-1][ptr + 1] < x) {
      |               ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
fish.cpp:75:25: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   75 |           while(ptr + 1 < possible_heights[i-2].size() && possible_heights[i-2][ptr + 1] < x) {
      |                 ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
3.0 / 3.0

# Verdict Execution time Memory Grader output
1 Correct 142 ms 59688 KB Output is correct
2 Correct 179 ms 68276 KB Output is correct
3 Correct 98 ms 53512 KB Output is correct
4 Correct 94 ms 53396 KB Output is correct
5 Correct 357 ms 100228 KB Output is correct
6 Correct 477 ms 94400 KB Output is correct

Subtask #2
6.0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 4948 KB Output is correct
2 Correct 227 ms 71184 KB Output is correct
3 Correct 282 ms 83284 KB Output is correct
4 Correct 144 ms 59692 KB Output is correct
5 Correct 163 ms 68240 KB Output is correct
6 Correct 2 ms 4948 KB Output is correct
7 Correct 2 ms 4948 KB Output is correct
8 Correct 2 ms 4948 KB Output is correct
9 Correct 2 ms 4964 KB Output is correct
10 Correct 95 ms 53536 KB Output is correct
11 Correct 94 ms 53508 KB Output is correct
12 Correct 153 ms 59708 KB Output is correct
13 Correct 173 ms 68200 KB Output is correct
14 Correct 156 ms 59724 KB Output is correct
15 Correct 170 ms 67072 KB Output is correct
16 Correct 182 ms 59744 KB Output is correct
17 Correct 162 ms 67000 KB Output is correct

Subtask #3
0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 97 ms 53400 KB Output is correct
2 Correct 102 ms 53404 KB Output is correct
3 Incorrect 126 ms 52256 KB 1st lines differ - on the 1st token, expected: '21261825233649', found: '20897672610412'
4 Halted 0 ms 0 KB -

Subtask #4
0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 4948 KB Output is correct
2 Correct 3 ms 4948 KB Output is correct
3 Correct 2 ms 4948 KB Output is correct
4 Correct 3 ms 4948 KB Output is correct
5 Correct 3 ms 4948 KB Output is correct
6 Correct 3 ms 4948 KB Output is correct
7 Correct 2 ms 4948 KB Output is correct
8 Correct 3 ms 4948 KB Output is correct
9 Incorrect 3 ms 5076 KB 1st lines differ - on the 1st token, expected: '216624184325', found: '215553967157'
10 Halted 0 ms 0 KB -

Subtask #5
0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 4948 KB Output is correct
2 Correct 3 ms 4948 KB Output is correct
3 Correct 2 ms 4948 KB Output is correct
4 Correct 3 ms 4948 KB Output is correct
5 Correct 3 ms 4948 KB Output is correct
6 Correct 3 ms 4948 KB Output is correct
7 Correct 2 ms 4948 KB Output is correct
8 Correct 3 ms 4948 KB Output is correct
9 Incorrect 3 ms 5076 KB 1st lines differ - on the 1st token, expected: '216624184325', found: '215553967157'
10 Halted 0 ms 0 KB -

Subtask #6
0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 4948 KB Output is correct
2 Correct 3 ms 4948 KB Output is correct
3 Correct 2 ms 4948 KB Output is correct
4 Correct 3 ms 4948 KB Output is correct
5 Correct 3 ms 4948 KB Output is correct
6 Correct 3 ms 4948 KB Output is correct
7 Correct 2 ms 4948 KB Output is correct
8 Correct 3 ms 4948 KB Output is correct
9 Incorrect 3 ms 5076 KB 1st lines differ - on the 1st token, expected: '216624184325', found: '215553967157'
10 Halted 0 ms 0 KB -

Subtask #7
0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 97 ms 53400 KB Output is correct
2 Correct 102 ms 53404 KB Output is correct
3 Incorrect 126 ms 52256 KB 1st lines differ - on the 1st token, expected: '21261825233649', found: '20897672610412'
4 Halted 0 ms 0 KB -

Subtask #8
0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 142 ms 59688 KB Output is correct
2 Correct 179 ms 68276 KB Output is correct
3 Correct 98 ms 53512 KB Output is correct
4 Correct 94 ms 53396 KB Output is correct
5 Correct 357 ms 100228 KB Output is correct
6 Correct 477 ms 94400 KB Output is correct
7 Correct 2 ms 4948 KB Output is correct
8 Correct 227 ms 71184 KB Output is correct
9 Correct 282 ms 83284 KB Output is correct
10 Correct 144 ms 59692 KB Output is correct
11 Correct 163 ms 68240 KB Output is correct
12 Correct 2 ms 4948 KB Output is correct
13 Correct 2 ms 4948 KB Output is correct
14 Correct 2 ms 4948 KB Output is correct
15 Correct 2 ms 4964 KB Output is correct
16 Correct 95 ms 53536 KB Output is correct
17 Correct 94 ms 53508 KB Output is correct
18 Correct 153 ms 59708 KB Output is correct
19 Correct 173 ms 68200 KB Output is correct
20 Correct 156 ms 59724 KB Output is correct
21 Correct 170 ms 67072 KB Output is correct
22 Correct 182 ms 59744 KB Output is correct
23 Correct 162 ms 67000 KB Output is correct
24 Correct 97 ms 53400 KB Output is correct
25 Correct 102 ms 53404 KB Output is correct
26 Incorrect 126 ms 52256 KB 1st lines differ - on the 1st token, expected: '21261825233649', found: '20897672610412'
27 Halted 0 ms 0 KB -