Submission #827351

#	Time	Username	Problem	Language	Result	Execution time	Memory
827351		GrindMachine	Catfish Farm (IOI22_fish)	C++17	35 / 100	1079 ms	156396 KiB

fish

// Om Namah Shivaya

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>

using namespace std;
using namespace __gnu_pbds;

template<typename T> using Tree = tree<T,null_type,less<T>,rb_tree_tag,tree_order_statistics_node_update>;
typedef long long int ll;
typedef long double ld;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;

#define fastio ios_base::sync_with_stdio(false); cin.tie(NULL)
#define pb push_back
#define endl '\n'
#define ff first
#define ss second
#define all(a) a.begin(),a.end()
#define rall(a) a.rbegin(),a.rend()
#define conts continue
#define sz(a) a.size()

#define rep(i,n) for(int i = 0; i < n; ++i)
#define rep1(i,n) for(int i = 1; i <= n; ++i)
#define rev(i,s,e) for(int i = s; i >= e; --i)
#define trav(i,a) for(auto &i : a)

template<typename T>
void amin(T &x, T y){
    x = min(x,y);
}

template<typename T>
void amax(T &x, T y){
    x = max(x,y);
}

#define debug(x) cout << #x << " = "; cout << x; cout << endl

const int MOD = 1e9 + 7;
const int N = 3e3 + 5;
const int inf1 = 1e9 + 5;
const ll inf2 = (ll)1e18 + 5;

#include "fish.h"

vector<pll> here[N];
ll n;
ll dp[N][N][2];

ll go(ll i, ll j, ll k){
    if(i == n){
        if(k == 0) return 0;
        else return -inf2;
    }

    if(dp[i][j+1][k] != -1){
        return dp[i][j+1][k];
    }

    auto &a = here[i];
    ll ans = -inf2;

    // take none
    amax(ans,go(i+1,n-1,0));

    if(k == 0){
        // taken guys have height <= j
        pll key = {j+1,-1};
        ll r = upper_bound(all(a),key)-a.begin()-1;
        ll sum = 0;

        rev(x,r,0){
            sum += a[x].ss;
            amax(ans,sum+go(i+1,a[x].ff-1,0));
        }

        // take > j, start 1 phase
        sum = 0;

        rep(x,sz(a)){
            sum += a[x].ss;
            amax(ans,sum+go(i+1,a[x].ff,1));
        }
    }
    else{
        // color at least >= j
        pll key = {j+1,-1};
        ll l = upper_bound(all(a),key)-a.begin();
        ll sum = 0;

        for(int x = l; x < sz(a); ++x){
            sum += a[x].ss;
            amax(ans,sum+go(i+1,a[x].ff,1));
        }
    }

    return dp[i][j+1][k] = ans;
}

long long max_weights(int n_, int m, std::vector<int> X, std::vector<int> Y,
                      std::vector<int> W) {
    
    n = n_;
    rep(i,m){
        here[X[i]].pb({Y[i],W[i]});
    }
    rep(i,n){
        sort(all(here[i]));
    }

    memset(dp,-1,sizeof dp);
    ll ans = go(0,-1,1);
    return ans;
}

Compilation message (stderr)

fish.cpp: In function 'll go(ll, ll, ll)':
fish.cpp:26:35: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   26 | #define rep(i,n) for(int i = 0; i < n; ++i)
      |                                   ^
fish.cpp:84:9: note: in expansion of macro 'rep'
   84 |         rep(x,sz(a)){
      |         ^~~
fish.cpp:95:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   95 |         for(int x = l; x < sz(a); ++x){
      |                          ^

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