Submission #831108

#	Time	Username	Problem	Language	Result	Execution time	Memory
831108		Liudas	Jousting tournament (IOI12_tournament)	C++17	100 / 100	75 ms	4692 KiB

tournament

#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <vector>
#include <algorithm>
#include <iostream>
using namespace std;
class segment_tree{
public:
    vector<int> tree, alive;
    int N;
    segment_tree(int K){
        N = 1;
        while(N <= K){
            N *= 2;
        }
        tree.assign(N * 2, 0);
        alive.assign(N * 2, 0);
    }
    void add_alive(int head, int l, int r, int pos, int val){
        if(r - l == 1){
            alive[head] = val; 
            return;   
        }
        int mid = (l + r) / 2;
        if(pos < mid){
            add_alive(head * 2 + 1, l, mid, pos, val);
        }
        else{
            add_alive(head * 2 + 2, mid, r, pos, val);
        }
        alive[head] = alive[head * 2 + 1] + alive[head * 2 + 2];
    }
    void add_alive(int pos, int val){
        add_alive(0, 0, N, pos, val);
    }
    int get_alive(int head, int l, int r, int need, int left){
        if(r - l == 1){
            return l;   
        }
        int mid = (l + r) / 2;
        if(need <= alive[head * 2 + 1] + left){
            return get_alive(head * 2 + 1, l, mid, need, left);
        }
        else{
            return get_alive(head * 2 + 2, mid, r, need, left + alive[head * 2 + 1]);
        }
    }
    int get_alive(int need){
        return get_alive(0, 0, N, need, 0);
    }
    void add_val(int head, int l, int r, int pos, int val){
        if(r - l == 1){
            tree[head] = val; 
            return;   
        }
        int mid = (l + r) / 2;
        if(pos < mid){
            add_val(head * 2 + 1, l, mid, pos, val);
        }
        else{
            add_val(head * 2 + 2, mid, r, pos, val);
        }
        tree[head] = max(tree[head * 2 + 1], tree[head * 2 + 2]);
    }
    void add_val(int pos, int val){
        add_val(0, 0, N, pos, val);
    }
    int get_val(int head, int l, int r, int L, int R){
        if(L <= l && R >= r){
            return tree[head];
        }
        if(L >= r || R <= l){
            return 0;
        }
        int mid = (l + r) / 2;
        return max(get_val(head * 2 + 1, l, mid, L, R), get_val(head * 2 + 2, mid, r, L, R));
    }
    int get_val(int l, int r){
        return get_val(0, 0, N, l, r);
    }
};
int GetBestPosition(int N, int C, int R, int K[], int S[], int E[]){
    segment_tree tree(N);
    vector<int> pref(N + 5);
    int ans = 0;
    int id = 0;
    vector<int> arr(N-1);
    for(int i = 0; i < N-1; i ++){
        arr[i] = K[i];
    }
        vector<int> brr = arr;
        fill(pref.begin(), pref.end(), 0);
        for(int j = 0; j < N-1; j ++){
            tree.add_val(j, brr[j]);
            tree.add_alive(j, 1);
        }
        tree.add_alive(N, 1);
        tree.add_alive(N-1, 1);
        for(int j = 0; j < C; j ++){
            int s = tree.get_alive(S[j] + 1), e = tree.get_alive(E[j] + 2), b = tree.get_alive(E[j] + 1);
            if(tree.get_val(s, b) < R){
                pref[s] ++;
                pref[e]--; 
            }
            for(int k = S[j]; k < E[j]; k ++){
                tree.add_alive(tree.get_alive(S[j] + 2), 0);
            }
        }
        int p = 0;
        for(int j = 0; j < N; j ++){
            p += pref[j];
            if(ans < p){
                ans = p;
                id = j;
            }
        }
    return id;
}

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