Submission #1165531

#	Time	Username	Problem	Language	Result	Execution time	Memory
1165531		HappyCapybara	Robots (IOI13_robots)	C++20	100 / 100	797 ms	57136 KiB

robots

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

int t;
vector<pair<int,int>> st;

void update(int pos, int val, int node=1, int tl=0, int tr=t-1){
    if (tl == tr){
        st[node] = {val, 1};
        return;
    }
    int tm = (tl+tr)/2;
    if (pos <= tm) update(pos, val, node*2, tl, tm);
    else update(pos, val, node*2+1, tm+1, tr);
    st[node] = {max(st[node*2].first, st[node*2+1].first), st[node*2].second+st[node*2+1].second};
}

int query(int val, int node=1, int tl=0, int tr=t-1){
    if (st[node].first < val) return 0;
    if (tl == tr) return st[node].second;
    if (st[node*2+1].first < val) return query(val, node*2, tl, (tl+tr)/2);
    else return st[node*2].second + query(val, node*2+1, (tl+tr)/2+1, tr);
}

int putaway(int A, int B, int T, int X[], int Y[], int W[], int S[]){
    t = T;
    st.resize(4*T, {0, 0});
    vector<int> x, y;
    vector<pair<int,int>> w, s;
    //cout << "a" << endl;
    for (int i=0; i<A; i++) x.push_back(X[i]);
    for (int i=0; i<B; i++) y.push_back(Y[i]);
    for (int i=0; i<T; i++){
        w.push_back({W[i], i});
        s.push_back({S[i], i});
    }
    //cout << "b" << endl;
    sort(w.begin(), w.end());
    reverse(w.begin(), w.end());
    sort(s.begin(), s.end());
    reverse(s.begin(), s.end());
    unordered_map<int,int> um;
    for (int i=0; i<T; i++) um[s[i].second] = i;
    //cout << "c" << endl;
    x.push_back(0); y.push_back(0);
    sort(x.begin(), x.end());
    reverse(x.begin(), x.end());
    sort(y.begin(), y.end());
    reverse(y.begin(), y.end());
    vector<vector<int>> g(A+1);
    //cout << "d" << endl;
    for (int i=0; i<T; i++){
        int l = -1, r = A;
        while (l != r-1){
            int m  = (l+r)/2;
            if (W[i] >= x[m]) r = m;
            else l = m;
        }
        int l2 = -1, r2 = B;
        while (l2 != r2-1){
            int m = (l2+r2)/2;
            if (S[i] >= y[m]) r2 = m;
            else l2 = m;
        }
        //cout << r << " " << r2 << endl;
        g[r].push_back(r2);
    }
    for (int i=0; i<=A; i++) g[i].push_back(B);
    for (int i=0; i<=B; i++) g[A].push_back(i);
    //cout << "e" << endl;
    int res = 1;
    int cur = 0;
    for (int i=0; i<=A; i++){
        while (cur != w.size() && w[cur].first >= x[i]){
            update(um[w[cur].second], S[w[cur].second]);
            cur++;
        }
        for (int j : g[i]){
            int ts = query(y[j]);
            if (i+j == 0){
                if (ts) return -1;
            }
            else res = max(res, (int) ceil((float) ts/ (float) (i+j)));
        }
    }
    return res;
}

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