Submission #625864

#	Time	Username	Problem	Language	Result	Execution time	Memory
625864		xynex	Catfish Farm (IOI22_fish)	C++17	3 / 100	124 ms	18160 KiB

fish

/**
  * Author: Tenjin
  * Created: 11.08.2022 05:09
  * Why am I so stupid? :c
  * Slishkom slab
**/

#include <bits/stdc++.h>
#include "fish.h"
// #pragma GCC optimize("inline")
// #pragma GCC optimize("-fgcse,-fgcse-lm")
// #pragma GCC optimize("-ftree-pre,-ftree-vrp")
// #pragma GCC optimize("-ffast-math")
// #pragma GCC optimize("-fipa-sra")
// #pragma GCC optimize("-fpeephole2")
// #pragma GCC optimize("-fsched-spec")
// #pragma GCC optimize("Ofast,no-stack-protector")
// #pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,avx2,tune=native")
// #pragma GCC optimize("unroll-loops")

using namespace std;

#define ll long long
#define dl double long
#define ull unsigned long long
#define pr pair
#define vt vector
#define ff first
#define ss second
#define mp make_pair
#define sz(a) (int)a.size()
#define pb push_back
#define pf push_front
#define popB pop_back
#define popF pop_front
#define bit_count __builtin_popcount
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define sp(x) fixed << setprecision(x)

template<typename T> T get_rand(T l, T r) {
  random_device rd;
  mt19937 gen(rd());
  return uniform_int_distribution<T>(l, r)(gen);
}
template<typename T> T lcm(T a, T b) { return a * (b / __gcd(a, b)); }

template<class A> void read(vt<A>& v);
template<class A, size_t S> void read(array<A, S>& a);
template<class T> void read(T& x) { cin >> x; }
void read(double& d) { string t; read(t); d = stod(t); }
void read(long double& d) { string t; read(t); d = stold(t); }
template<class H, class... T> void read(H& h, T&... t) { read(h); read(t...); }
template<class A> void read(vt<A>& x) { for (auto& a : x) read(a); }
template<class A, size_t S> void read(array<A, S>& x) { for (auto& a : x) read(a); }

string to_string(char c) { return string(1, c); }
string to_string(bool b) { return b ? "true" : "false"; }
string to_string(const char* s) { return string(s); }
string to_string(string s) { return s; }
string to_string(vt<bool> v) { string res; for (int i = 0; i < sz(v); ++i) res += char('0' + v[i]); return res; }
template<size_t S> string to_string(bitset<S> b) { string res; for (int i = 0; i < S; ++i) res += char('0' + b[i]); return res; }
template<class T> string to_string(T v) { bool f = 1; string res; for (auto x : v) { if (!f) res += ' '; f = 0; res += to_string(x); } return res; }

template<class A> void write(A x) { cout << to_string(x); }
template<class H, class... T> void write(const H& h, const T&... t) { write(h); write(t...); }

void print() { write("\n"); }
template<class H, class... T> void print(const H& h, const T&... t) { write(h); if (sizeof...(t)) write(' '); print(t...); }

void freop(string s) {
  freopen((s + ".in").c_str(), "r", stdin);
  freopen((s + ".out").c_str(), "w", stdout);
}

const int MOD = 1e9 + 7;
const int N = 3e6 + 5;
const ll INF = 9e12;
const int M = 3e3 + 5;
const dl pi = acos(-1);
const dl eps = 1e-12;
const int sq = 700;

int dx[] = {-1, 0, 1, 0};
int dy[] = {0, -1, 0, 1};
/* ll vs int*/

ll max_weights(int n, int m, vector<int> x, vector<int> y, vector<int> w) {
  vt<vt<pr<int, ll> >> fishes(n);
  for(int i = 0; i < m; ++i) {
    fishes[x[i]].pb({y[i], w[i]});
  }
  vt<ll> pref(n, -INF);
  vt<ll> last1, last2;
  for(int x = 0; x < n; ++x) {
    sort(all(fishes[x]));
    vt<ll> cur1(sz(fishes[x]), -INF);
    ll mx1 = -INF, lastmx1 = -INF;
    if(x > 0) {
      int pos = sz(fishes[x - 1]) - 1;
      for(int i = sz(fishes[x]) - 1; i >= 0; --i) {
        int Y = fishes[x][i].ff;
        ll W = fishes[x][i].ss;
        cur1[i] = max(0ll, mx1) + W;
        if(x > 1) {
          cur1[i] = max(cur1[i], pref[x - 2] + W);
        }
        while(pos >= 0) {
          if(fishes[x - 1][pos].ff <= Y) break;
          lastmx1 = max(lastmx1, last1[pos]);
          pos--;
        }
        cur1[i] = max(cur1[i], lastmx1 + W);
        mx1 = max(mx1, cur1[i]);
      }
    }
    if(!last1.empty()) mx1 = *max_element(all(last1));
    swap(last1, cur1);
    vt<ll> cur2(sz(fishes[x]), -INF);
    ll mx2 = -INF, lastmx2 = -INF;
    if(x < n - 1) {
      int pos = 0;
      for(int i = 0; i < sz(fishes[x]); ++i) {
        int Y = fishes[x][i].ff;
        ll W = fishes[x][i].ss;
        cur2[i] = max(0ll, mx2) + W;
        if(x > 1) {
          cur2[i] = max(cur2[i], pref[x - 2] + W);
        }
        while(pos < sz(last2)) {
          if(fishes[x - 1][pos].ff > Y) break;
          lastmx2 = max(lastmx2, last2[pos]);
          pos++;
        }
        cur2[i] = max(cur2[i], lastmx2 + W);
        mx2 = max(mx2, cur2[i]);
      }
    }
    if(!last2.empty()) mx2 = *max_element(all(last2));
    swap(last2, cur2);
    if(x)  pref[x] = max({pref[x - 1], mx1, mx2});
    else pref[x] = max({mx1, mx2});
  }
  return pref[n - 1];
}

Compilation message (stderr)

fish.cpp: In function 'void freop(std::string)':
fish.cpp:72:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   72 |   freopen((s + ".in").c_str(), "r", stdin);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
fish.cpp:73:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   73 |   freopen((s + ".out").c_str(), "w", stdout);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 3 / 3
• Subtask 2: 0 / 6
• Subtask 3: 0 / 9
• Subtask 4: 0 / 14
• Subtask 5: 0 / 21
• Subtask 6: 0 / 17
• Subtask 7: 0 / 14
• Subtask 8: 0 / 16