Submission #256386

#	Time	Username	Problem	Language	Result	Execution time	Memory
256386		Sorting	Robots (IOI13_robots)	C++17	100 / 100	2382 ms	32996 KiB

robots

#include "robots.h"
#include <bits/stdc++.h>

using namespace std;

const int k_T = 1e6 + 3;

int a, b, t;
int *x, *y, *w, *s;
array<int, 2> p1[k_T], p2[k_T];
bool used[k_T];

bool check(int mid){
    for(int i = 0; i < t; ++i)
        used[i] = false;

    int j = 0;
    priority_queue<array<int, 2>> s;
    for(int i = 0; i < b; ++i){
        while(j != t && y[i] > p2[j][0]){
            s.push({w[p2[j][1]], p2[j][1]});
            j++;
        }
        for(int k = 0; k < mid && !s.empty(); ++k){
            auto arr = s.top();
            s.pop();

            used[arr[1]] = true;
        }
    }

    j = 0;
    vector<int> idx;
    for(int i = 0; i < a; ++i){
        while(j != t && x[i] > p1[j][0]){
            if(!used[p1[j][1]])
                idx.push_back(p1[j][1]);
            j++;
        }
        for(int k = 0; k < mid && !idx.empty(); ++k){
            used[idx.back()] = true;
            idx.pop_back();
        }
    }

    for(int i = 0; i < t; ++i)
        if(!used[i])
            return false;
    return true;
}

int putaway(int A, int B, int T, int X[], int Y[], int W[], int S[]){
    a = A, b = B, t = T, x = X, y = Y, w = W, s = S;
    sort(x, x + a);
    sort(y, y + b);

    for(int i = 0; i < t; ++i){
        p1[i] = {w[i], i};
        p2[i] = {s[i], i};
    }
    sort(p1, p1 + t);
    sort(p2, p2 + t);

    int l = 1, r = t + 1;
    while(l != r){
        int mid = (l + r) >> 1;
        if(check(mid)) r = mid;
        else l = mid + 1;
    }
    if(l == t + 1) l = -1;
    return l;
}

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