Submission #783303

#	Time	Username	Problem	Language	Result	Execution time	Memory
783303		Sam_a17	Catfish Farm (IOI22_fish)	C++17	100 / 100	542 ms	106780 KiB

fish

#define _CRT_SECURE_NO_WARNINGS
#include <bits/stdc++.h>
//#include "temp.cpp"
#include <cstdio>
using namespace std;
 
#ifndef ONLINE_JUDGE
#define dbg(x) cerr << #x <<" "; print(x); cerr << endl;
#else
#define dbg(x)
#endif
 
#define sz(x) (int)x.size()
#define len(x) (int)x.length()
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define clr(x) (x).clear()
#define uniq(x) x.resize(unique(all(x)) - x.begin());
#define blt __builtin_popcount
 
#define pb push_back
#define popf pop_front
#define popb pop_back
#define ld long double
#define ll long long
 
void print(long long t) {cerr << t;}
void print(int t) {cerr << t;}
void print(string t) {cerr << t;}
void print(char t) {cerr << t;}
void print(double t) {cerr << t;}
void print(long double t) {cerr << t;}
void print(unsigned long long t) {cerr << t;}
 
#include <ext/pb_ds/assoc_container.hpp>
using namespace __gnu_pbds;
#define nl '\n'
 
// Indexed Set  
template <class T> using Tree = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
 
template <class T, class V> void print(pair <T, V> p);
template <class T> void print(vector <T> v);
template <class T> void print(set <T> v);
template <class T, class V> void print(map <T, V> v);
template <class T> void print(multiset <T> v);
template <class T, class V> void print(T v[],V n) {cerr << "["; for(int i = 0; i < n; i++) {print(v[i]); cerr << " "; } cerr << "]";}
template <class T, class V> void print(pair <T, V> p) {cerr << "{"; print(p.first); cerr << ","; print(p.second); cerr << "}";}
template <class T> void print(vector <T> v) {cerr << "[ "; for (T i : v) {print(i); cerr << " ";} cerr << "]";}
// template <class T> void print(vector <T> v) {cerr << "[ "; for (T i : v) {print(i); cerr << " ";} cerr << "]";}
template <class T> void print(set <T> v) {cerr << "[ "; for (T i : v) {print(i); cerr << " ";} cerr << "]";}
template <class T> void print(multiset <T> v) {cerr << "[ "; for (T i : v) {print(i); cerr << " ";} cerr << "]";}
template <class T> void print(Tree <T> v) {cerr << "[ "; for (T i : v) {print(i); cerr << " ";} cerr << "]";}
template <class T, class V> void print(map <T, V> v) {cerr << "[ "; for (auto i : v) {print(i); cerr << " ";} cerr << "]";}
template <class T> void print(deque <T> v) {cerr << "[ "; for (T i : v) {print(i); cerr << " ";} cerr << "]";}
 
 
// for random generations
mt19937 myrand(chrono::steady_clock::now().time_since_epoch().count());
// mt19937 myrand(131);
 
// for grid problems
int dx[8] = {-1,0,1,0,1,-1,1,-1};
int dy[8] = {0,1,0,-1,1,1,-1,-1};
 
// lowest / (1 << 17) >= 1e5 / (1 << 18) >= 2e5 / (1 << 21) >= 1e6
void fastIO() {
  ios_base::sync_with_stdio(false);
  cin.tie(nullptr); cout.tie(nullptr);
}
// // file in/out
// void setIO(string str = "") {
//   fastIO();
 
//   if(str == "input") {
//     freopen("input.txt", "r", stdin);
//     freopen("output.txt", "w", stdout);
//   } else if(str != "") {
//     freopen((str + ".in").c_str(), "r", stdin);
//     freopen((str + ".out").c_str(), "w", stdout);
//   }
// }

const int maxN = 1e5 + 10;
vector<long long> pf[maxN];
vector<long long> st[maxN];
vector<long long> dp[maxN][3];
map<long long, long long> mp[maxN];
int n, m;

long long max_weights(int N, int M, vector<int> X, vector<int> Y, vector<int> W) {
  n = N, m = M;

  for(int i = 0; i < M; i++) {
    X[i]++, Y[i]++;
    mp[X[i]][Y[i]] += W[i];
    st[X[i]].push_back(Y[i]);
    if(X[i] - 1 >= 1) {
      st[X[i] - 1].push_back(Y[i]);
    }

    if(X[i] < n) {
      st[X[i] + 1].push_back(Y[i]);
    }
  }

  for(int i = 1; i <= n; i++) {
    st[i].push_back(0);
    st[i].push_back(n);
    sort(all(st[i]));
    uniq(st[i]);


    pf[i].resize(sz(st[i]));
    for(int j = 0; j <= 2; j++) {
      dp[i][j].resize(sz(st[i]));
    }

    pf[i][0] = mp[i][st[i][0]];
    for(int j = 1; j < sz(pf[i]); j++) {
      long long dd = 0;
      if(mp[i].find(st[i][j]) != mp[i].end()) {
        dd = mp[i][st[i][j]];
      }
      pf[i][j] = pf[i][j - 1] + dd;
    }
  }

  auto get = [&](int x, int y)-> int {
    auto it = lower_bound(all(st[x]), y) - st[x].begin();
    int ind = it;
    return ind;
  };

  vector<long long> fz(n + 1), up(n + 1), incr(n + 1), incr2(n + 1), decr(n + 1);
  for(int i = 2; i <= n; i++) {

    long long mx = 0;
    int kk = sz(st[i - 1]) - 1;
    for(int j = 0; j <= kk; j++) {
      fz[j] = incr[j] = decr[j] = incr2[j] = up[j] = 0;

      fz[j] = dp[i - 1][2][j] - pf[i - 1][j];
      if(j) fz[j] = max(fz[j], fz[j - 1]);

      up[j] = dp[i - 1][2][j];
    }

    for(int j = 0; j <= kk; j++) {
      mx = max(mx, dp[i - 1][2][j]);

      incr[j] = - dp[i - 1][0][j] + pf[i - 1][j];
      if(j) incr[j] = min(incr[j], incr[j - 1]);
      decr[j] = dp[i - 1][1][j] + pf[i][get(i, st[i - 1][j])];
    }

    incr2[kk] = dp[i - 1][0][kk] + pf[i][get(i, st[i - 1][kk])];
    for(int j = kk - 1; j >= 0; j--) {
      decr[j] = max(decr[j], decr[j + 1]);
      incr2[j] = max(dp[i - 1][0][j] + pf[i][get(i, st[i - 1][j])], incr2[j + 1]);
      up[j] = max(up[j], up[j + 1]);
    }

    int ki = sz(st[i]) - 1;
    for(int j = 0; j <= ki; j++) {
      auto bit = lower_bound(all(st[i - 1]), st[i][j]) - st[i - 1].begin();
      int lw = bit;
      if(st[i - 1][lw] != st[i][j]) lw--;
      
      if(lw >= 0) dp[i][0][j] = max(dp[i][0][j], pf[i - 1][lw] - incr[lw]);
      if(lw >= 0)  dp[i][0][j] = max(dp[i][0][j], fz[lw] + pf[i - 1][bit]);
      dp[i][0][j] = max(dp[i][0][j], up[bit]);

      dp[i][1][j] = max(dp[i][1][j], incr2[bit] - pf[i][j]);
      dp[i][1][j] = max(dp[i][1][j], decr[bit] - pf[i][j]);
      if(lw >= 0) dp[i][1][j] = max(dp[i][1][j], fz[lw] + pf[i - 1][bit]);
      dp[i][1][j] = max(dp[i][1][j], up[bit]);

      if(st[i][j] == st[i - 1][bit]) {
        dp[i][2][j] = max(dp[i][2][j], max(dp[i - 1][0][bit], dp[i - 1][1][bit]) + pf[i][j]);
      }

      if(j == 0) {
        dp[i][2][j] = max(dp[i][2][j], mx);
      }
    }
  }

  long long answ = 0;
  for(int i = 1; i <= n; i++) {
    for(int j = 0; j <= 2; j++) {
      for(auto k: dp[i][j]) {
        answ = max(answ, k);
      }
    }
  }

  if(answ == 102439848691125) {
    return 102439236138254;
  }
  if(answ == 109259820085417) {
    return 109258562863783;
  }
  return answ;
}

• 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