Submission #352277

#	Time	Username	Problem	Language	Result	Execution time	Memory
352277		ryansee	Carnival Tickets (IOI20_tickets)	C++14	27 / 100	677 ms	52844 KiB

tickets

#include "tickets.h"
 
#include "bits/stdc++.h"
using namespace std;
 
#define FAST ios_base::sync_with_stdio(false); cin.tie(0);
#define pb push_back
#define eb emplace_back
#define ins insert
#define f first
#define s second
#define cbr cerr<<"hi\n"
#define mmst(x, v) memset((x), v, sizeof ((x)))
#define siz(x) ll(x.size())
#define all(x) (x).begin(), (x).end()
#define lbd(x,y) (lower_bound(all(x),y)-x.begin())
#define ubd(x,y) (upper_bound(all(x),y)-x.begin())
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());    //can be used by calling rng() or shuffle(A, A+n, rng)
inline long long rand(long long x, long long y) { return rng() % (y+1-x) + x; } //inclusivesss
string inline to_string(char c) {string s(1,c);return s;} template<typename T> inline T gcd(T a,T b){ return a==0?llabs(b):gcd(b%a,a); }
 
using ll=long long; 
using ld=long double;
#define FOR(i,s,e) for(ll i=s;i<=ll(e);++i)
#define DEC(i,s,e) for(ll i=s;i>=ll(e);--i)
using pi=pair<ll,ll>; using spi=pair<ll,pi>; using dpi=pair<pi,pi>; 
 
long long LLINF = 1e18;
int INF = 1e9+1e6;
#define MAXN (200006)
 
int n, m;
ll ans;
 
long long find_maximum(int k, std::vector<std::vector<int>> x) {
	n = x.size(), m = x[0].size(), ans = 0;
	vector<vector<int>> ret(n, vector<int>(m, -1));
	vector<int> front(n, 0), back(n, m-1);
	
	FOR(K,0,k-1) {
		vector<pi> v;
		vector<ll> C;
		FOR(i,0,n-1) {
			v.eb(-x[i][front[i]] - (x[i][back[i]] - ll(1e9)), i);
		}
		sort(all(v), greater<pi>());
		FOR(i,0,n/2-1) {
			int ind = v[i].s;
			C.eb(x[ind][front[ind]]), ret[ind][front[ind]]=K, ++ front[ind];
		}
		FOR(i,n/2,n-1) {
			int ind = v[i].s;
			C.eb(x[ind][back[ind]]), ret[ind][back[ind]]=K, -- back[ind];
		}
      sort(all(C));
		ll mid = C[siz(C)/2];
		for(auto i:C) ans += abs(i - mid);
	}
	
	allocate_tickets(ret);
	return ans;
}

• Subtask 1: 11 / 11
• Subtask 2: 16 / 16
• Subtask 3: 0 / 14
• Subtask 4: 0 / 14
• Subtask 5: 0 / 12
• Subtask 6: 0 / 23
• Subtask 7: 0 / 10