Submission #1070238

#	Time	Username	Problem	Language	Result	Execution time	Memory
1070238		allin27x	Robots (IOI13_robots)	C++17	90 / 100	3048 ms	35836 KiB

robots

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

vector<pair<int,int>> T;


bool check(int a, int b, int t, int X[], int Y[], int W[], int S[], int cp) {
    auto ta = T;
    multiset<pair<int,int>> bt;
    for (int i=0; i<b; i++) bt.insert({Y[i], cp});
    for (int i=0; i<t; i++) {
        auto it  = bt.lower_bound({ta[i].second, 1});
        if (it == bt.end()) continue;
        pair<int,int> q = *it;
        bt.erase(bt.find(q)); q.second--; if (q.second) bt.insert(q);
        ta[i].first = -1;
    }

    vector<pair<int,int>> tb;
    for (int i=0; i<t; i++) if (ta[i].first!=-1) tb.push_back(ta[i]);
    multiset<pair<int,int>> at;
    for (int i=0; i<a; i++) at.insert({X[i], cp});
    for (int i=0; i<tb.size(); i++) {
        auto it  = at.lower_bound({tb[i].first, 1});
        if (it == at.end()) return 0;
        pair<int,int> q = *it;
        at.erase(at.find(q)); q.second--; if (q.second) at.insert(q);
    }


    return 1;
}

int putaway(int a, int b, int t, int X[], int Y[], int W[], int S[]){
    for (int i=0; i<t; i++) W[i]++;
    for (int i=0; i<t; i++) S[i]++;
    sort(X, X+a); sort(Y, Y+b);
    for (int i = 0; i < t; i++) T.push_back(make_pair(W[i],S[i]));
    sort(T.begin(),T.end(), greater<pair<int,int>>());

    int l = 1, r  = t+1;
    while (l<r) {
        int m = (l+r)/2;
        if (check(a,b,t,X,Y,W,S,m)) r = m;
        else l = m+1;
    }
    if (l==t+1) return -1; else return l;

    /*
    if (W[t-1] > X[a-1]) return -1;
    int mc = a-1; int toy = t-1; int cnt = 0;
    vector<int> exc(a, 0);
    while (mc){
        while (X[mc-1] < W[toy]) toy--, cnt++;
        exc[mc] = cnt; cnt = 0; mc--;
    }
    exc[mc] = toy+1;
    // for (int i=0; i<a; i++) cout<<exc[i]<<' ';
    int ans = 1;
    for (int i=a-2; i>=0; i--) exc[i] = exc[i+1]+exc[i];
    for (int i=0; i<a; i++) ans = max(ans, (exc[i]+a-1-i)/(a-i));
    */
}


/*
5
0
9
1 5 6 8 30
5 0
5 0
3 0
5 0
8 0
12 0
14 0
19 0
20 0
*/

Compilation message (stderr)

robots.cpp: In function 'bool check(int, int, int, int*, int*, int*, int*, int)':
robots.cpp:24:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   24 |     for (int i=0; i<tb.size(); i++) {
      |                   ~^~~~~~~~~~

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