Submission #585171

#	Time	Username	Problem	Language	Result	Execution time	Memory
585171		Drew_	Robots (IOI13_robots)	C++17	100 / 100	351 ms	9160 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 putaway(int A, int B, int T, int X[], int Y[], int W[], int S[]) 
{
    if (A > B)
        swap(A, B), swap(X, Y), swap(W, S);

    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)
    {
        int p = (int)(upper_bound(X, X+A, W[i]) - X);
        int q = (int)(upper_bound(Y, Y+B, S[i]) - Y);
        vec.pb({p, q});
    }
    sort(vec.rbegin(), vec.rend());

    int ar[MAX];
    const auto check = [&](int val) -> bool
    {
        for (int i = 0; i <= B; ++i)
            ar[i] = 0;

        for (int i = 0, ctr = 0; i < T; ++i)
        {
            if (ctr < 1ll * (A - vec[i].f1) * val)
                ctr++;
            else ar[0]++, ar[vec[i].s2 + 1]--;
        }
        for (int i = 1; i <= B; ++i)
            ar[i] += ar[i-1];

        for (int i = 0; i <= B; ++i)
            if (ar[i] > 1ll * (B-i) * val)
                return false;

        return true;
    };

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

    return l;
}

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