Submission #1243319

#	Time	Username	Problem	Language	Result	Execution time	Memory
1243319		Zbyszek99	Prisoner Challenge (IOI22_prison)	C++20	100 / 100	17 ms	1096 KiB

prison

#include "prison.h"
#include <bits/stdc++.h>
#define ll long long
#define ld long double
#define ull unsigned long long
#define ff first
#define ss second
#define pii pair<int,int>
#define pll pair<long long, long long>
#define vi vector<int>
#define vl vector<long long>
#define pb push_back
#define rep(i, b) for(int i = 0; i < (b); ++i)
#define rep2(i,a,b) for(int i = a; i <= (b); ++i)
#define rep3(i,a,b,c) for(int i = a; i <= (b); i+=c)
#define count_bits(x) __builtin_popcountll((x))
#define all(x) (x).begin(),(x).end()
#define siz(x) (int)(x).size()
#define forall(it,x) for(auto& it:(x))
using namespace std;
const int INF = 1e9+50;
const ll INF_L = 1e18+40;
const ll MOD = 1e9+7;

vi splits = {3,3,3,3,3,2,2,1,2,2};
int n;
vector<pii> sp;

pii nxt_lr(int l, int r, int s, int val)
{
    sp = {};
    int siz_ = (r-l+1)/splits[s];
    int add_ = (r-l+1) - splits[s]*siz_;
    rep(i,add_)
    {
        sp.pb({l,l+siz_});
        l += siz_+1;
    }
    rep(i,splits[s]-add_)
    {
        sp.pb({l,l+siz_-1});
        l += siz_;
    }
    pii new_pair = {-1,-1};
    forall(it,sp)
    {
        if(val >= it.ff && val <= it.ss) 
        {
            new_pair = it;
        }
    }
    return new_pair;
}

int what_print(int val, int num)
{
    int l = 1;
    int r = n;
    int cur_del = 0;
    rep(s,siz(splits))
    {
        l++;
        r--;
        pii new_pair = nxt_lr(l,r,s,val);
        forall(it,sp)
        {
            if(val >= it.ff && val <= it.ss) 
            {
                new_pair = it;
            }
        }
        if(cur_del+splits[s] < num)
        {
            l = new_pair.ff;
            r = new_pair.ss;
            cur_del += splits[s];
        }
        else
        {
            int k = num-cur_del-1;
            if(num == 0 || (val >= sp[k].ff && val <= sp[k].ss))
            {
                pii new_pair2;
                if(num != 0)
                {
                    if(val == sp[k].ff) return -1;
                    if(val == sp[k].ss) return -2;
                    new_pair2 = nxt_lr(new_pair.ff+1,new_pair.ss-1,s+1,val);
                }
                else
                {
                    new_pair2 = nxt_lr(l,r,0,val);
                }
                int beg_num = (num != 0 ? cur_del+splits[s]+1 : 1);
                rep(k,10)
                {
                    if(new_pair2.ff == sp[k].ff) break;
                    beg_num++;
                }
                return beg_num;
            }   
            else
            {
                if(val < sp[k].ff)
                {
                    return -1;
                }
                return -2;
            }
        }
    }
}

vector<vi> devise_strategy(int N) 
{
    n = N;
    vector<vi> ans;
    vi zero(n+1);
    zero[0] = 0;
    zero[1] = -1;
    zero[n] = -2;
    rep2(i,2,n-1)
    {
        zero[i] = what_print(i,0);
    }
    int cur_max = 0;
    rep2(i,2,n-1) cur_max = max(cur_max,zero[i]);
    ans.pb(zero);
    int cur_print = 1;
    while(cur_print <= cur_max)
    {
        int cur_del = 0;
        vi p;
        p.pb(0);
        rep(s,siz(splits))
        {
            p[0] ^= 1;
            if(cur_del+splits[s] >= cur_print)
            {
                break;
            }
            cur_del+=splits[s];
        }
        rep2(i,1,n)
        {
            int pr = what_print(i,cur_print);
            if(pr != -1 && pr != -2) p.pb(pr);
            else
            {
                if(pr == -1)
                {
                    if(p[0] == 1) pr = -2;
                }
                else
                {
                    if(p[0] == 1) pr = -1; 
                }
                p.pb(pr);
            }
        }
        ans.pb(p);
        rep2(i,1,n) cur_max = max(cur_max,p[i]);
        cur_print++;
    }
    return ans;
}

Compilation message (stderr)

prison.cpp: In function 'int what_print(int, int)':
prison.cpp:112:1: warning: control reaches end of non-void function [-Wreturn-type]
  112 | }
      | ^

• Subtask 1: 5 / 5
• Subtask 2: 5 / 5
• Subtask 3: 90 / 90