Submission #370596

#	Time	Username	Problem	Language	Result	Execution time	Memory
370596		Fysty	Cave (IOI13_cave)	C++17	100 / 100	528 ms	764 KiB

cave

#include <bits/stdc++.h>
#include "cave.h"
using namespace std;
typedef long long ll;
typedef pair<ll,ll> pll;
#define rep(i,n) for(int i=0;i<n;i++)
#define rep1(i,n) for(int i=1;i<n;i++)
#define F first
#define S second
#define pb push_back
//int tryCombination(vector<int> S);
//void answer(vector<int> S,vector<int> D);
bool vis[5005];
void exploreCave(int N)
{
    int n=N;
    int a[n],tmp[n],tmp2[n],s[n],d[n];
    rep(i,n) a[i]=0;
    rep(i,n)
    {
        bool x=0;
        if(tryCombination(a)==i) x=1;
        vector<int> pos;
        rep(i,n) tmp[i]=a[i];
        if(x)
        {
            rep(i,n) if(!vis[i]) tmp[i]=1;
        }
        rep(i,n) if(!vis[i]) pos.pb(i);
        int l=0,r=pos.size()-1;
        while(l<r)
        {
            int mid=l+r>>1;
            rep(i,n) tmp2[i]=tmp[i];
            for(int j=l;j<=mid;j++)
            {
                if(x) tmp2[pos[j]]=0;
                else tmp2[pos[j]]=1;
            }
            if(tryCombination(tmp2)==i) r=mid;
            else l=mid+1;
        }
        vis[pos[l]]=1;
        s[pos[l]]=x;
        d[pos[l]]=i;
        a[pos[l]]=s[pos[l]];
    }
    answer(s,d);
}

Compilation message (stderr)

cave.cpp: In function 'void exploreCave(int)':
cave.cpp:33:22: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   33 |             int mid=l+r>>1;
      |                     ~^~

• Subtask 1: 12 / 12
• Subtask 2: 13 / 13
• Subtask 3: 21 / 21
• Subtask 4: 30 / 30
• Subtask 5: 24 / 24