Submission #585026

#	Time	Username	Problem	Language	Result	Execution time	Memory
585026		Drew_	Robots (IOI13_robots)	C++17	0 / 100	1 ms	468 KiB

robots

#include "robots.h"
#include <bits/stdc++.h>
using namespace std;

#define pb push_back
#define f1 first
#define s2 second

using ii = pair<int, int>;

const int MAX = 5e4 + 69;

int bit[MAX];
inline void add(int x, int val)
{
    for (++x; x < MAX; x += (x & -x))
        bit[x] += val;
}

inline int sum(int x)
{
    int res = 0;
    for (++x; x > 0; x -= (x & -x))
        res += bit[x];
    return res;
}

int putaway(int A, int B, int T, int X[], int Y[], int W[], int S[]) 
{
    {
        vector<int> comp;
        for (int i = 0; i < A; ++i)
            comp.pb(X[i]);
        for (int i = 0; i < T; ++i)
            comp.pb(W[i]);
        sort(comp.begin(), comp.end());
        comp.resize(unique(comp.begin(), comp.end()) - comp.begin());

        for (int i = 0; i < A; ++i)
            X[i] = 1 + (int)(lower_bound(comp.begin(), comp.end(), X[i]) - comp.begin());
        for (int i = 0; i < T; ++i)
            W[i] = 1 + (int)(lower_bound(comp.begin(), comp.end(), W[i]) - comp.begin());
    }

    {
        vector<int> comp;
        for (int i = 0; i < B; ++i)
            comp.pb(Y[i]);
        for (int i = 0; i < T; ++i)
            comp.pb(S[i]);
        sort(comp.begin(), comp.end());
        comp.resize(unique(comp.begin(), comp.end()) - comp.begin());

        for (int i = 0; i < B; ++i)
            Y[i] = 1 + (int)(lower_bound(comp.begin(), comp.end(), Y[i]) - comp.begin());
        for (int i = 0; i < T; ++i)
            S[i] = 1 + (int)(lower_bound(comp.begin(), comp.end(), S[i]) - comp.begin());   
    }
    sort(X, X+A);
    sort(Y, Y+B);

    for (int i = 0; i < T; ++i)
    {
        if ((A == 0 || X[A-1] <= W[i]) && (B == 0 || Y[B-1] <= S[i]))
            return -1;
    }

    vector<ii> vec;
    for (int i = 0; i < T; ++i)
        vec.pb({S[i], W[i]});
    sort(vec.rbegin(), vec.rend());

    const auto check = [&](int val) -> bool
    {
        memset(bit, 0, sizeof(bit));
        
        vector<int> v;
        for (int i = 0; i < T; ++i)
        {
            int id = (int)(upper_bound(X, X+A, vec[i].f1) - X);
            if (sum(id) < 1ll * (A-id) * val)
                add(id, 1);
            else v.pb(vec[i].s2);
        }

        memset(bit, 0, sizeof(bit));
        for (int x : v)
        {
            int id = (int)(upper_bound(Y, Y+B, x) - Y);
            if (sum(id) < 1ll * (B-id) * val)
                add(id, 1);
            else return false;
        }
        return true;
    };

    int l = 1, r = 1e6;
    while (l < r)
    {
        int mid = (l + r) >> 1;
        if (check(mid)) r = mid;
        else l = mid + 1;
    }

    return l;
}

• Subtask 1: 0 / 14
• Subtask 2: 0 / 14
• Subtask 3: 0 / 25
• Subtask 4: 0 / 37
• Subtask 5: 0 / 10