Submission #1070320

#	Time	Username	Problem	Language	Result	Execution time	Memory
1070320		allin27x	Robots (IOI13_robots)	C++17	100 / 100	2930 ms	28540 KiB

robots

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

const int MAXT = 1e6+2;
array<int,2> T[MAXT];
int ex[MAXT];
multiset<pair<int,int>> bt;

bool check(int a, int b, int t, int X[], int Y[], int cp) {
    for (int i=0; i<t; i++) ex[i] = 1;
    for (int i=0; i<b; i++) bt.insert({Y[i], cp});
    for (int i=0; i<t; i++) {
        auto it  = bt.lower_bound({T[i][1], 1});
        if (it == bt.end()) continue;
        pair<int,int> q = *it;
        bt.erase(it); q.second--; if (q.second) bt.insert(q);
        ex[i] = 0;
    }
    vector<int> W; for (int i=t-1; i>=0; i--) if (ex[i]) W.push_back(T[i][0]);
    if (W.empty()) return 1;
    if (!a) return 0;
    if (W[W.size()-1] > X[a-1]) return 0;
    int mc = a-1; int toy = W.size()-1; int cnt = 0;
    vector exc(a, 0);
    while (mc){
        while (toy >=0 && X[mc-1] < W[toy]) toy--, cnt++;
        exc[mc] = cnt; cnt = 0; mc--;
    }
    exc[mc] = toy+1;
    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));

    return (ans<=cp);
}

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[i][0] = W[i], T[i][1] = S[i];
    sort(T, T+t, greater<array<int,2>>());
    int l = 1, r  = t+1;
    while (l<r) {
        bt.clear();
        int m = (l+r)/2;
        if (check(a,b,t,X,Y,m)) r = m;
        else l = m+1;
    }
    if (l==t+1) return -1; else return l;

}

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