Submission #839078

#	Time	Username	Problem	Language	Result	Execution time	Memory
839078		abczz	Catfish Farm (IOI22_fish)	C++17	100 / 100	227 ms	42444 KiB

fish

#include "fish.h"
#include <iostream>
#include <vector>
#include <algorithm>
#include <array>
#include <map>
#include <queue>
#define ll long long
using namespace std;

vector <array<ll, 2>> V[100000];
vector <ll> pre;
vector <array<ll, 3>> dp[100000];
long long max_weights(int N, int M, std::vector<int> X, std::vector<int> Y,
                      std::vector<int> W) {
  ll f = -1e18, j, k, l, s = 0, t = 0, v, x, u, p = -1e18, mx, mx2, cur;
  map <ll, ll> mp;
  for (int i=0; i<M; ++i) {
    V[X[i]].push_back({Y[i], W[i]});
  }
  for (int i=0; i<N; ++i) {
    sort(V[i].begin(), V[i].end());
  }
  j = 0;
  s = 0;
  for (auto [y, w] : V[1]) {
    s += w;
    dp[0].push_back({y, 0, (ll)-1e18});
    f = max(f, s);
  }
  for (int i=1; i<N; ++i) {
    if (i >= 3) {
      j = 0;
      s = 0;
      for (auto [y, w, a] : dp[i-3]) {
        w = max(w, a);
        while (j < V[i-2].size() && V[i-2][j][0] <= y) {
          s += V[i-2][j][1];
          ++j;
        }
        p = max(p, s+w);
      }
    }
    mp.clear();
    mx = mx2 = -1e18, s = 0;
    if (i >= 2) {
      j = 0;
      for (auto [y, w, a] : dp[i-2]) {
        w = max(w, a);
        while (j < V[i-1].size() && V[i-1][j][0] <= y) {
          s += V[i-1][j][1];
          ++j;
        }
        mx = max(mx, w);
        mx2 = max(mx2, w+s);
      }
    }
    for (auto [y, w] : V[i-1]) {
      ++mp[y];
    }
    if (i != N-1) {
      for (auto [y, w] : V[i+1]) {
        ++mp[y];
      }
    }
    s = j = k = t = 0;
    v = x = -1e18;
    pre.clear();
    for (auto [y, w, a] : dp[i-1]) {
      while (j < V[i].size() && V[i][j][0] <= y) {
        s += V[i][j][1];
        ++j;
      }
      while (k < V[i-1].size() && V[i-1][k][0] <= y) {
        t += V[i-1][k][1];
        ++k;
      }
      v = max(v, max(w, a)+s);
      x = max(x, w-t);
    }
    s = j = k = t = l = u = 0;
    for (auto [y, z] : mp) {
      while (j < V[i].size() && V[i][j][0] <= y) {
        s += V[i][j][1];
        ++j;
      }
      while (k < V[i-1].size() && V[i-1][k][0] <= y) {
        t += V[i-1][k][1];
        ++k;
      }
      while (i != N-1 && l < V[i+1].size() && V[i+1][l][0] <= y) {
        u += V[i+1][l][1];
        ++l;
      }
      cur = max(max(t, p+t), max(mx2, mx+t));
      //cout << v << " " << x << " " << s << " " << t << endl;
      //cout << cur << endl;
      cur = max(cur, x+t);
      //cout << cur << endl;
      dp[i].push_back({y, cur, v-s});
      //cout << i << " " << y << " " << cur << "/" << v-s << endl;
      cur = max(cur, v-s);
      f = max(f, cur + u);
    }
  }
  return f;
}

Compilation message (stderr)

fish.cpp: In function 'long long int max_weights(int, int, std::vector<int>, std::vector<int>, std::vector<int>)':
fish.cpp:37:18: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::array<long long int, 2> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   37 |         while (j < V[i-2].size() && V[i-2][j][0] <= y) {
      |                ~~^~~~~~~~~~~~~~~
fish.cpp:50:18: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::array<long long int, 2> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   50 |         while (j < V[i-1].size() && V[i-1][j][0] <= y) {
      |                ~~^~~~~~~~~~~~~~~
fish.cpp:70:16: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::array<long long int, 2> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   70 |       while (j < V[i].size() && V[i][j][0] <= y) {
      |              ~~^~~~~~~~~~~~~
fish.cpp:74:16: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::array<long long int, 2> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   74 |       while (k < V[i-1].size() && V[i-1][k][0] <= y) {
      |              ~~^~~~~~~~~~~~~~~
fish.cpp:83:16: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::array<long long int, 2> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   83 |       while (j < V[i].size() && V[i][j][0] <= y) {
      |              ~~^~~~~~~~~~~~~
fish.cpp:87:16: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::array<long long int, 2> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   87 |       while (k < V[i-1].size() && V[i-1][k][0] <= y) {
      |              ~~^~~~~~~~~~~~~~~
fish.cpp:91:28: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::array<long long int, 2> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   91 |       while (i != N-1 && l < V[i+1].size() && V[i+1][l][0] <= y) {
      |                          ~~^~~~~~~~~~~~~~~

• Subtask 1: 3 / 3
• Subtask 2: 6 / 6
• Subtask 3: 9 / 9
• Subtask 4: 14 / 14
• Subtask 5: 21 / 21
• Subtask 6: 17 / 17
• Subtask 7: 14 / 14
• Subtask 8: 16 / 16