Submission #1027103

#	Time	Username	Problem	Language	Result	Execution time	Memory
1027103		YassineBenYounes	Overtaking (IOI23_overtaking)	C++17	39 / 100	3558 ms	16220 KiB

overtaking

#include<bits/stdc++.h>
#include "overtaking.h"
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef double db;
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#define pbds tree<int, null_type, less<int>,rb_tree_tag, tree_order_statistics_node_update>
using namespace __gnu_pbds;
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);
using namespace std;
////////////////////Only Clear Code//////////////////////////
 
void usaco_problem(){
    freopen("milkvisits.in", "r", stdin);
    freopen("milkvisits.out", "w", stdout);
}
 
void in(){
    #ifndef ONLINE_JUDGE
 
freopen("input.txt", "r", stdin);
 
freopen("output.txt", "w", stdout);
 
#endif // ONLINE_JUDGE
}
const int mx = 1005;
const int LOG = 22;
const int inf = 1e9;
const ll mod = 998244353;
const int sq = 320;

ll e[mx][mx];
ll t[mx][mx];
vl Tm;
int n, m, x;
vl w, s;
void init(int L, int N, vl T, vi W, int X, int M, vi S){
    n = N;m = M;x = X;
    for(int o : W){
        w.pb(o);
    }
    for(int o : S){
        s.pb(o);
    }
    Tm = T;
    for(int i = 0; i < n;i++){
        t[i][0] = Tm[i];
    }
}

//t[i][j] : when bus i arrives at sorting station j

ll arrival_time(ll Y){
    t[n][0] = Y;
    vll a, b;
    for(int i = 0; i <= n;i++){
        a.pb({t[i][0], i});
    }
    sort(all(a));
    for(int j = 1;j < m;j++){
        e[n][j] = t[n][j-1] + x * (s[j] - s[j-1]);
        for(int ia = 0; ia < a.size();ia++){
            int i = a[ia].ss;
            if(i == n)continue;
            e[i][j] = t[i][j-1] + w[i] * (s[j] - s[j-1]);
        }
        int k = 0;
        ll ans = 0;
        for(int ia = 0; ia < a.size();ia++){
            int i = a[ia].ss;
            while(k < a.size() && a[k].ff < a[ia].ff){
                ans = max(ans, e[a[k].ss][j]);
                k++;
            }
            t[i][j] = max(e[i][j], ans);
        }
        /*for(int i = 0; i <= n;i++){
            t[i][j] = e[i][j];
            while(k < a.size() && a[k].ff < t[i][j-1]){
                ans = max(ans, e[a[k].ss][j]);
                k++;
            }
            //t[i][j] = max(e[i][j], ans);
            for(int k = 0;k <= n;k++){
                if(t[k][j-1] < t[i][j-1]){
                    t[i][j] = max(t[i][j], e[k][j]);
                }
            }
        }*/

        vll b;
        for(int ia = 0; ia < a.size();ia++){
            int i = a[ia].ss;
            if(t[i][j] > t[n][j]){
                //cout << i << endl;
                continue;
            }
            //cout << i << endl;
            b.pb({t[i][j], i});
        }
        a = b;
        //a.pb({t[n][j], n});
        sort(all(a));
        /*for(int i = 0; i <= n;i++){
            cout << t[i][j] << " ";
        }
        cout << endl;*/
    }
    return t[n][m-1];
}


/*
int32_t main(){
    in();
    init(6, 4, {20, 10, 40, 0}, {5, 20, 20, 30}, 10, 4, {0, 1, 3, 6});
    cout << arrival_time(0) << 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)

overtaking.cpp: In function 'll arrival_time(ll)':
overtaking.cpp:82:28: 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]
   82 |         for(int ia = 0; ia < a.size();ia++){
      |                         ~~~^~~~~~~~~~
overtaking.cpp:89:28: 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]
   89 |         for(int ia = 0; ia < a.size();ia++){
      |                         ~~~^~~~~~~~~~
overtaking.cpp:91:21: 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]
   91 |             while(k < a.size() && a[k].ff < a[ia].ff){
      |                   ~~^~~~~~~~~~
overtaking.cpp:112:28: 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]
  112 |         for(int ia = 0; ia < a.size();ia++){
      |                         ~~~^~~~~~~~~~
overtaking.cpp: In function 'void usaco_problem()':
overtaking.cpp:33:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   33 |     freopen("milkvisits.in", "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
overtaking.cpp:34:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   34 |     freopen("milkvisits.out", "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
overtaking.cpp: In function 'void in()':
overtaking.cpp:40:8: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   40 | freopen("input.txt", "r", stdin);
      | ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
overtaking.cpp:42:8: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   42 | freopen("output.txt", "w", stdout);
      | ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 0: 0 / 0
• Subtask 1: 9 / 9
• Subtask 2: 10 / 10
• Subtask 3: 20 / 20
• Subtask 4: 0 / 26
• Subtask 5: 0 / 35