Submission #1057134

#	Time	Username	Problem	Language	Result	Execution time	Memory
1057134		YassineBenYounes	Tricks of the Trade (CEOI23_trade)	C++17	45 / 100	2957 ms	812104 KiB

trade

#include<bits/stdc++.h>
#include<chrono>
#include<random>
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef double db;
ll gcd(ll a , ll b) {return b ? gcd(b , a % b) : a ;} // greatest common divisor (PGCD)
ll lcm(ll a , ll b) {return (a * b) / gcd(a , b);} // least common multiple (PPCM)
int dx[8] = {1, 0, 0, -1, 1, 1, -1, -1};
int dy[8] = {0, 1, -1, 0, 1, -1, -1, 1};
#define endl "\n"
#define ss second
#define ff first
#define all(x) (x).begin() , (x).end()
#define pb push_back
#define vi vector<int>
#define vii vector<pair<int,int>>
#define vl vector<ll>
#define vll vector<pair<ll,ll>>
#define pii pair<int,int>
#define pll pair<ll,ll>
#define pdd  pair<double,double>
#define vdd  vector<pdd>
#define speed ios::sync_with_stdio(false);cin.tie(0);cout.tie(0);
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#define pbds tree<pii, null_type, less<pii>,rb_tree_tag, tree_order_statistics_node_update>
using namespace __gnu_pbds;
using namespace std;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
 
////////////////////Only Clear Code//////////////////////////
 
void usaco_problem(){
    freopen("milkvisits.in", "r", stdin);
    freopen("milkvisits.out", "w", stdout);
}
 
void init(){
    #ifndef ONLINE_JUDGE
 
freopen("input.txt", "r", stdin);
freopen("output.txt", "w", stdout);
#endif // ONLINE_JUDGE
}
const int mx = 250003;
const int LOG = 22;
const int inf = 1e9;
const ll mod = 1e9+7;
const int sq = 300;
const ld ebs = 0.000001;
int n, k;

ll buy[mx], sell[mx];

ll dp1[mx][202], dp2[mx][202];

ll solve1(int ind, int left){
    if(ind == n)return (left == 0 ? 0 : -1e17);
    if(dp1[ind][left] != -1e18)return dp1[ind][left];
    ll a = -1e17, b = -1e17;
    if(left == k){
        a = solve1(ind+1, left-1) + sell[ind] - buy[ind];
        b = solve1(ind+1, left);
    }
    else if(left == 0){
        b = solve1(n, left);
    }
    else{
        a = solve1(ind+1, left-1) + sell[ind] - buy[ind];
        b = solve1(ind+1, left) - buy[ind];
    }
    return dp1[ind][left] = max(a, b);
}

ll solve2(int ind, int left){
    if(ind < 0)return (left == 0 ? 0 : -1e17);
    if(dp2[ind][left] != -1e18)return dp2[ind][left];
    ll a = -1e17, b = -1e17;
    if(left == k){
        a = solve2(ind-1, left-1) + sell[ind] - buy[ind];
        b = solve2(ind-1, left);
    }
    else if(left == 0){
        b = solve2(-1, left);
    }
    else{
        a = solve2(ind-1, left-1) + sell[ind] - buy[ind];
        b = solve2(ind-1, left) - buy[ind];
    }
    return dp2[ind][left] = max(a, b);
}

int32_t main(){
    speed;
    cin >> n >> k;
    for(int i = 0; i < n;i++){
        cin >> buy[i];
    }
    for(int i = 0; i < n;i++){
        cin >> sell[i];
    }
    for(int i = 0; i < n;i++){
        for(int j = 0;j <= min(n, 200);j++){
            dp1[i][j] = dp2[i][j] = -1e18;
        }
    }
    cout << solve1(0, k) << endl;
    string res(n, '0'); 
    for(int ind = 0; ind < n;ind++){
        for(int left = 0; left < k;left++){
            ll a = solve1(ind+1, left) + sell[ind] - buy[ind] + solve2(ind-1, k-left-1);
            if(a == solve1(0, k)){
                res[ind] = '1';
            }
        }
    }
    cout << res << endl;
}
 
/*
    NEVER GIVE UP!
    DOING SMTHNG IS BETTER THAN DOING NTHNG!!!
    Your Guide when stuck:
    - Continue keyword only after reading the whole input
    - Don't use memset with testcases
    - Check for corner cases(n=1, n=0)
    - Check where you declare n(Be careful of declaring it globally and in main)
*/

Compilation message (stderr)

trade.cpp: In function 'void usaco_problem()':
trade.cpp:36:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   36 |     freopen("milkvisits.in", "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
trade.cpp:37:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   37 |     freopen("milkvisits.out", "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
trade.cpp: In function 'void init()':
trade.cpp:43:8: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   43 | freopen("input.txt", "r", stdin);
      | ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
trade.cpp:44:8: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   44 | freopen("output.txt", "w", stdout);
      | ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 0: 0 / 0
• Subtask 1: 10 / 10
• Subtask 2: 0 / 10
• Subtask 3: 10 / 10
• Subtask 4: 25 / 25
• Subtask 5: 0 / 45