Submission #995531

#	Time	Username	Problem	Language	Result	Execution time	Memory
995531		CSQ31	Robots (IOI13_robots)	C++17	100 / 100	1102 ms	21072 KiB

robots

#pragma GCC optimize("Ofast") 
#include "robots.h"
#include<bits/stdc++.h>
using namespace std;
#define fi first
#define se second
typedef pair<int,int> pii;
struct fenwick{
	int n;
	vector<int>bit;
	void upd(int pos,int val){
		for(int i=pos;i<=n;i+=i&(-i))bit[i]+=val;
	}
	int query(int r){
		int res = 0;
		for(int i=r;i>0;i-=i&(-i))res+=bit[i];
	    return res;
	}
    int search(int val){
		int sum = 0,pos = 0;
		for(int i=19;i>=0;i--){
			if(pos+(1<<i) < n && sum+bit[pos+(1<<i)]<val){
				pos+=(1<<i);
				sum+=bit[pos];
			}
		}
		return pos+1;
	}
	fenwick(int _n){
		n = _n;
		bit.assign(n+1,0);
	}
};
int putaway(int A, int B, int T, int X[], int Y[], int W[], int S[]) {
    vector<int>x,y;
    for(int i=0;i<A;i++)x.push_back(X[i]);
    for(int i=0;i<B;i++)y.push_back(Y[i]);
    sort(x.begin(),x.end());
    sort(y.begin(),y.end());
 
    vector<pii>pt(T);
    for(int i=0;i<T;i++){
        W[i] = lower_bound(x.begin(),x.end(),W[i]+1) - x.begin();
        S[i] = lower_bound(y.begin(),y.end(),S[i]+1) - y.begin();
        pt[i] = {W[i],S[i]};
    }
   // for(pii x:pt)cout<<x.fi<<" "<<x.se<<'\n';
        
    sort(pt.begin(),pt.end());
 
    int l = 1,r = T;
    while(r>=l){
        int mid = (l+r)/2;
        fenwick f(B+1);
        int p = 0,tot = 0;
        for(int i=0;i<A;i++){
            while(p<T && pt[p].fi <= i){
                f.upd(pt[p].se+1,1);
                tot++;
                p++;
            }
            for(int j=0;j<mid;j++){
                if(!tot)break;
                int k = f.search(tot);
                f.upd(k,-1);
                tot--;
            }
        }
        while(p!=T){
            f.upd(pt[p].se+1,1);
            tot++;
            p++;
        }
        //cout<<mid<<'\n';
       // for(int i=1;i<=B+1;i++)cout<<f.query(i)<<" ";
       // cout<<'\n';
        bool ok = 1;
        if(tot - f.query(B))ok = 0;
        for(int i=0;i<B;i++){
            int sum = tot - f.query(i);
            if(sum > mid * 1LL* (B-i))ok = 0;
        }
        if(ok)r = mid-1;
        else l = mid+1;
    }
    if(l == T+1)return -1;
    return l;
}

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