Submission #117991

#	Time	Username	Problem	Language	Result	Execution time	Memory
117991		rajarshi_basu	Jousting tournament (IOI12_tournament)	C++14	0 / 100	1050 ms	2428 KiB

tournament

#include <iostream>
#include <vector>
#include <set>
#include <iomanip>
#include <algorithm>
#include <functional>
#include <stdio.h>
#include <cmath>
#include <queue>
#include <string>
#include <map>
#include <fstream>
#include <complex>
#include <stack>
#include <set>

#define FOR(i,n) for(int i=0;i<n;i++)
#define FORE(i,a,b) for(int i=a;i<=b;i++)
#define ll long long int
#define vi vector<int>
#define ii pair<int,int>
#define pb push_back
#define mp make_pair
#define ff first
#define ss second
#define pll pair<ll,ll>
#define cd complex<double> 
#define ld long double
#define pld pair<ld,ld>
#define iii pair<ii,int>

using namespace std;

const ll INF = 1e9+10;
const int MAXN = 100*100*10+10;

int elimArray[MAXN];//means after the ith cell, elimArray[i] had been eliminated.
vector<ii> modifRange;
int prevBest[MAXN];
int nextBest[MAXN];

int GetBestPosition(int n,int c,int r,int* arr,int* ss,int* ee){
	// first modify the range to their actual sizes;
	// this step is O(n^2) for now. change to O(nlogn) later.
	FOR(i,c){
		int s = ss[i];
		int e = ee[i];
		int ctr = 0;
		FORE(j,s,e){
			ctr += elimArray[j];
		}
		modifRange.pb({s,e+ctr});
		elimArray[s] += e-s;
	}
	// now for each position, find its closest left and right element greater than r;
	// this step is already O(n)
	int bestFound = -1;
	FOR(i,n-1){
		prevBest[i] = bestFound;
		if(arr[i] > r)bestFound = i;
	}
	prevBest[n-1] = bestFound;
	bestFound = n;
	for(int i = n-2;i>=0;i--){
		nextBest[i+1] = bestFound;
		if(arr[i] > r)bestFound = i;
	}
	nextBest[0] = bestFound;
/*
	FOR(i,n-1)cout << arr[i] << " ";cout << endl;
	for(auto e: modifRange){
		cout << e.ff << " " << e.ss << endl;
	}
	cout << endl;
	FOR(i,n-1)cout << prevBest[i] << " ";cout << endl;
	FOR(i,n-1)cout << nextBest[i] << " ";cout << endl;
*/
	int mx = 0;
	FOR(i,n){
		int hit = 0;
		for(auto e : modifRange){
			if(e.ss < i or e.ff > i)continue;
			else if(e.ff <= prevBest[i] or e.ss >= nextBest[i]+1){
				break;
			}
			hit++;
		}
		//cout <<i << " " << hit << endl;
		mx = max(mx,hit);
	}
	return mx;
}

int ma1in(){
	int arr[4];
	arr[0] = 1;
	arr[1] = 0;
	arr[2] = 2;
	arr[3] = 4;
	int s[3] = {1,0,0};
	int e[3] = {3,1,1};
	cout << GetBestPosition(5,3,3,arr,s,e) << endl;

}

Compilation message (stderr)

tournament.cpp: In function 'int ma1in()':
tournament.cpp:104:1: warning: no return statement in function returning non-void [-Wreturn-type]
 }
 ^

• Subtask 1: 0 / 17
• Subtask 2: 0 / 32
• Subtask 3: 0 / 51