Submission #172305

#	Time	Username	Problem	Language	Result	Execution time	Memory
172305		ho94949	Robots (IOI13_robots)	C++17	100 / 100	2745 ms	33228 KiB

robots

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

#include "robots.h"

bool can(vector<int> X, vector<int> Y, vector<pair<int, int> > Z, int T)
{
    int ztp = 0;
    priority_queue<pair<int, int> > Q;
    for(auto y: Y)
    {
        while(ztp<(int)Z.size() && Z[ztp].second < y)
            Q.emplace(Z[ztp++]);
        for(int i=0; i<T && !Q.empty(); ++i)
            Q.pop();
    }
    while(ztp<(int)Z.size()) Q.emplace(Z[ztp++]);
    vector<int> remainX;
    while(!Q.empty())
    {
        remainX.push_back(Q.top().first);
        Q.pop();
    }
    sort(remainX.begin(), remainX.end());
    int xtp = 0;
    for(auto x: X)
        for(int i=0; i<T && xtp != (int)remainX.size() && remainX[xtp] < x; ++i)
            ++xtp;            

    return xtp == (int)remainX.size();
}

int putaway(int A, int B, int T, int X[], int Y[], int W[], int S[]) {
    int lo = 0; //impos
    int hi = T+1; //pos

    vector<int> _X(X, X+A), _Y(Y, Y+B);
    vector<pair<int, int> > ws;
    for(int i=0; i<T; ++i)
        ws.emplace_back(W[i], S[i]);
    
    //sort X, Y, ws according to second value
    sort(_X.begin(), _X.end());
    sort(_Y.begin(), _Y.end());
    sort(ws.begin(), ws.end(), [](pair<int, int> a, pair<int, int> b)
    {
        return a.second < b.second;
    });

    while(lo+1!=hi)
    {
        int mi = (lo+hi)>>1;
        if(can(_X, _Y, ws, mi)) hi = mi;
        else lo = mi;
    }
    if(hi == T+1) return -1;
    return hi;
}

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