Submission #965519

#	Time	Username	Problem	Language	Result	Execution time	Memory
965519		ThegeekKnight16	Robots (IOI13_robots)	C++17	76 / 100	3044 ms	34276 KiB

robots

#include <bits/stdc++.h>
#include "robots.h"
using namespace std;
#pragma GCC optimize("O3")
#pragma GCC target("avx2")

bool Test(int x, int A, int B, int T, int *X, int *Y, const vector<pair<int, int>> &Toy)
{
    if ((long long)x*(A+B) < T) return 0;
    vector<int> sweep; //id
    sweep.reserve(max(A, B)+T);
    int idT = 0, idA = 0;
    while (idT < T && idA < A)
    {
        if (X[idA] <= Toy[idT].first) sweep.push_back(-1), idA++;
        else sweep.push_back(idT++);
    }
    while (idT < T) sweep.push_back(idT++);
    while (idA < A) sweep.push_back(-1), idA++;

    multiset<int> remain;
    for (auto id : sweep)
    {
        if (id == -1)
        {
            int remov = x;
            if (remov >= remain.size()) remain.clear(), remov = 0;
            while (remov > 0) remain.erase(prev(remain.end())), --remov;
        }
        else remain.insert(Toy[id].second);
    }

    sweep.clear(); //now type
    auto it = remain.begin(); int idB = 0;
    while (it != remain.end() && idB < B)
    {
        if (Y[idB] <= *it) sweep.push_back(-1), idB++;
        else sweep.push_back(1), it++;
    }
    if (it != remain.end()) return 0;
    while (idB < B) sweep.push_back(-1), idB++;

    int cnt = 0;
    for (auto type : sweep)
    {
        if (type == -1) cnt = max(0, cnt-x);
        else cnt++;
    }
    return (cnt == 0);
}

int putaway(int A, int B, int T, int X[], int Y[], int _W[], int _S[])
{
    vector<pair<int, int>> Toy(T);
    for (int i = 0; i < T; i++) Toy[i] = make_pair(_W[i], _S[i]);
    sort(X, X+A); sort(Y, Y+B);
    for (int i = 0; i < T; i++) if (Toy[i].first >= X[A-1] && Toy[i].second >= Y[B-1]) return -1;
    sort(Toy.begin(), Toy.end());

    int ini = 1, fim = T;
    while (ini < fim)
    {
        int m = (ini + fim) >> 1;
        if (Test(m, A, B, T, X, Y, Toy)) fim = m;
        else ini = m+1;
    }
    return fim;
}

Compilation message (stderr)

robots.cpp: In function 'bool Test(int, int, int, int, int*, int*, const std::vector<std::pair<int, int> >&)':
robots.cpp:27:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::multiset<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   27 |             if (remov >= remain.size()) remain.clear(), remov = 0;
      |                 ~~~~~~^~~~~~~~~~~~~~~~

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