Submission #428975

#	Time	Username	Problem	Language	Result	Execution time	Memory
428975		wiwiho	Jousting tournament (IOI12_tournament)	C++14	100 / 100	189 ms	11900 KiB

tournament

#include <bits/stdc++.h>
#include <bits/extc++.h>

#define mp make_pair
#define F first
#define S second
#define eb emplace_back
#define iter(a) a.begin(), a.end()
#define lsort(a) sort(iter(a))
#define uni(a) a.resize(unique(iter(a)));
#define printv(a, b) { \
    for(auto pv : a) b << pv << " "; \
    b << "\n"; \
}

using namespace std;

typedef long long ll;

using pii = pair<int, int>;
using tree = __gnu_pbds::tree<int, __gnu_pbds::null_type, less<>, __gnu_pbds::rb_tree_tag, __gnu_pbds::tree_order_statistics_node_update>;

const ll MOD = 1000000000;

int GetBestPosition(int n, int m, int R, int *K, int *S, int *E) {

    vector<int> pos;
    for(int i = 0; i < n - 1; i++){
        if(K[i] > R) pos.eb(i);
    }
    
    tree tr;
    for(int i = 0; i <= n; i++) tr.insert(i);

    vector<pii> ev;
    vector<bool> kill(m);
    for(int i = 0; i < m; i++){
        auto lit = tr.find_by_order(S[i]);
        auto rit = tr.find_by_order(E[i]);
        S[i] = *lit;
        E[i] = *next(rit) - 1;
        for(auto it = next(lit); *it <= E[i]; it = tr.erase(it));
        ev.eb(mp(S[i], i + 1));
        ev.eb(mp(E[i] + 1, -i - 1));
        auto it = lower_bound(iter(pos), S[i]);
        kill[i] = it != pos.end() && *it < E[i];
    }
    lsort(ev);

    tree now;
    set<int> ks;
    int ep = 0;
    int ans = 0, ansp = 0;
    for(int i = 0; i < n; i++){
        while(ep < ev.size() && ev[ep].F <= i){
            if(ev[ep].S > 0){
                int id = ev[ep].S - 1;
                now.insert(id);
                if(kill[id]) ks.insert(id);
            }
            else{
                int id = -ev[ep].S - 1;
                now.erase(id);
                ks.erase(id);
            }
            ep++;
        }

        int tans;
        if(ks.empty()) tans = now.size();
        else tans = now.order_of_key(*ks.begin());

        if(tans > ans){
            ans = tans;
            ansp = i;
        }
    }

    return ansp;
}

Compilation message (stderr)

tournament.cpp: In function 'int GetBestPosition(int, int, int, int*, int*, int*)':
tournament.cpp:55:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   55 |         while(ep < ev.size() && ev[ep].F <= i){
      |               ~~~^~~~~~~~~~~

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