Submission #874230

#	Time	Username	Problem	Language	Result	Execution time	Memory
874230		Matjaz	Jousting tournament (IOI12_tournament)	C++14	49 / 100	1042 ms	2136 KiB

tournament

#include <vector>
#include <algorithm>
#include <iostream>

using namespace std;


// Insight: each S[i] E[i] corresponds to some interval in the original set of positions
// The interval only matters if your player is in it - and there is a unique answer as to whether it wins or loses
// You can find the best position with a sweep.


int GetBestPosition(int N, int C, int R, int *K, int *S, int *E) {
    
    int best_position = 0;
    int best_wins = 0;
    
    vector<pair<int,int> > positions(N);
    vector<pair<int,int> > intervals(C);
    for (int i=0;i<N;i++) positions[i] = make_pair(i,i);
    for (int i=0;i<C;i++){
        intervals[i] = make_pair(positions[S[i]].first, positions[E[i]].second);
        positions[S[i]] = intervals[i];
        for (int j=E[i]+1;j<N;j++) positions[S[i] + j - E[i]] = positions[j];
    }
    
    vector<int> s(N+1);
    s[0] = 0;
    for (int i=1;i<=N;i++) s[i] = s[i-1] + (K[i-1] > R);
    
    
    for (int p=0;p<N;p++){
        int wins = 0;
        
        for (int i=0;i<C;i++){
            if (intervals[i].first <= p && p <= intervals[i].second){
                if (s[intervals[i].second] - s[intervals[i].first] == 0) wins++;
            }
        }
        
        if (wins > best_wins){
            best_wins = wins;
            best_position = p;
        }
    }
    
    
    return best_position;
}

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