Submission #1057015

#	Time	Username	Problem	Language	Result	Execution time	Memory
1057015		YassineBenYounes	Tricks of the Trade (CEOI23_trade)	C++17	5 / 100	234 ms	52364 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 = 1e6+5;
const int LOG = 22;
const int inf = 1e9;
const ll mod = 1e9+7;
const int sq = 300;
const ld ebs = 0.000001;

ll buy[mx], sell[mx], pf[mx];
ll freq[mx];
int32_t main(){
    speed;
    int n, k;cin >> n >> k;
    for(int i = 0; i < n;i++){
        cin >> buy[i];
        pf[i] = (i == 0 ? 0 : pf[i-1]) + buy[i];
    }
    multiset<ll> s;
    map<ll, vi> mp;
    for(int i = 0; i < n;i++){
        cin >> sell[i];
        if(i > 0){
            s.insert(sell[i] - pf[i]);
            mp[sell[i] - pf[i]].pb(i);
        }
    }
    ll ans = -1e18;
    for(int i = 0; i < (n-1);i++){
        ll cur = sell[i] + (i == 0 ? 0 : pf[i-1]) + *s.rbegin();
        //cout << i << " " << *s.rbegin() << " " << cur << endl;
        ans = max(ans, cur);
        s.erase(s.find(sell[i+1] - pf[i+1]));
    }
    string res(n, '0');
    for(int i = 1; i < n;i++){
        s.insert(sell[i] - pf[i]);
        mp[sell[i] - pf[i]].pb(i);
    }
    for(int i = 0; i < (n-1);i++){
        if(s.empty())break;
        ll k = *s.rbegin();
        ll cur = sell[i] + (i == 0 ? 0 : pf[i-1]) + k;
        //cout << i << " " << *s.rbegin() << " " << cur << endl;
        if(cur == ans){
            res[i] = '1';
            for(int x : mp[k]){
                res[x] = '1';
            }
            s.erase(k);
        }
        ll p = sell[i+1] - pf[i+1];
        if(s.count(p))s.erase(s.find(p));
    }
    cout << ans << endl;
    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: 0 / 10
• Subtask 2: 0 / 10
• Subtask 3: 5 / 10
• Subtask 4: 0 / 25
• Subtask 5: 0 / 45