Submission #77298

#	Time	Username	Problem	Language	Result	Execution time	Memory
77298		toreto_back	Highway Tolls (IOI18_highway)	C++14	0 / 100	142 ms	2308 KiB

highway

#include "highway.h"
#include <bits/stdc++.h>
#define F first
#define S second
using namespace std;
typedef long long ll;
typedef double D;
const ll mod=1e9+7;

vector<int>w;
int m;
void init(int x){
    for(int j=0;j<m;j++)w[j]=x;
}
void find_pair(int N, vector<int> U, vector<int> V, int A, int B) {
    int l=0,r=N-1,M=U.size(),n=N;
    int q=99;m=M;
    for(int i=0;i<m;i++)w.push_back(0);
    ll c=ask(w);
    int len=c/A;
    while(r-l+1>2*len && r-l+1-len+1>q){
//        cout<<l<<" "<<r<<endl;
        int mid=(l+r)/2;
        init(0);
        for(int i=l;i<mid;i++)w[i]=1;
        ll c1=ask(w);q--;
        if(c1==c){
            l=max(0,mid-len+1);
        }
        else r=min(mid+len-1,n-1);
    }
    ll xa=0,xb=0;
    while(!xa&&!xb && r-l+1-len+1>q){
        init(1);
        for(int i=l;i<(l+r)/2;i++)w[i]=0;
        ll c1=ask(w);q--;
        if(c1==c){
            r=(l+r)/2+1;
        }
        else if(c1==len*B){
            l=(l+r)/2-1;
        }
        else{
            c=c1;
            ll d=len,a=A,b=B;
            xb=(c-d*a)/(b-a);
            xa=d-xb;
            xa=(l+r)/2 - xa;
//            cout<<xa<<" "<<xa+len<<endl;
            answer(xa,xa+len);
            return;
        }
    }
    for(int i=l;;i++){
        init(1);
        for(int j=i;j<len+i;j++)w[j]=0;
        ll c1=ask(w);
        if(c1==c){
            answer(i,i+len);
            break;
        }
    }
}

• Subtask 1: 0 / 5
• Subtask 2: 0 / 7
• Subtask 3: 0 / 6
• Subtask 4: 0 / 33
• Subtask 5: 0 / 18
• Subtask 6: 0 / 31