Submission #784506

#	Time	Username	Problem	Language	Result	Execution time	Memory
784506		ZHIRDILBILDIZ	Rainforest Jumps (APIO21_jumps)	C++14	37 / 100	4064 ms	193040 KiB

jumps

#include<bits/stdc++.h>
#include "jumps.h"
using namespace std ;
const int N = 2e5 ;
bool flag1, flag2, flag3 ;
int pw[N + 1], dist[2001][2001], mn[2001][2001][11], ds[N], mx[N][18] ;
vector<int> gr[N + 1] ;
void bfs(int city)
{
    for(int i = 0 ; i < 2000 ; i++)
        dist[city][i] = 1e9 ;
    deque<int> d ;
    d.push_back(city) ;
    dist[city][city] = 0 ;
    while(d.size())
    {
        int num = d[0] ;
        d.pop_front() ;
        for(int i : gr[num])
        {
            if(dist[city][i] != 1e9)continue ;
            dist[city][i] = dist[city][num] + 1 ;
            d.push_back(i) ;
        }
    }
}
int more_bfs(int a, int b, int c, int d)
{
    int ans = 1e9 ;
    deque<int> dq ;
    for(int i = 0 ; i < N ; i++)
    {
        ds[i] = 1e9 ;
        if(a <= i && i <= b)ds[i] = 0, dq.push_back(i) ;
    }
    while(dq.size())
    {
        int num = dq[0] ;
        if(c <= num && num <= d)
            ans = min(ans, ds[num]) ;
        dq.pop_front() ;
        for(int i : gr[num])
        {
            if(ds[i] != 1e9)continue ;
            ds[i] = ds[num] + 1 ;
            dq.push_back(i) ;
        }
    }
    if(ans == 1e9)ans = -1 ;
    return ans ;
}
void build_sparce_table(int city)
{
    for(int i = 2 ; i <= 2000 ; i++)
        pw[i] = pw[i / 2] + 1 ;
    for(int i = 0 ; i < 2000 ; i++)
        mn[city][i][0] = dist[city][i] ;
    for(int i = 1 ; i < 11 ; i++)
        for(int j = 0 ; j <= 2000 - (1 << i) ; j++)
            mn[city][j][i] = min(mn[city][j][i - 1], mn[city][j + (1 << (i - 1))][i - 1]) ;
}
int get_min(int l, int r, int city)
{
    int num = pw[r - l + 1] ;
    return min(mn[city][l][num], mn[city][r - (1 << num) + 1][num]) ;
}
void build_sparce(vector<int> a)
{
    for(int i = 2 ; i <= N ; i++)
        pw[i] = pw[i / 2] + 1 ;
    for(int i = 0 ; i < a.size() ; i++)
        mx[i][0] = a[i] ;
    for(int i = 1 ; i < 18 ; i++)
        for(int j = 0 ; j <= (int)a.size() - (1 << i) ; j++)
            mx[j][i] = max(mx[j][i - 1], mx[j + (1 << (i - 1))][i - 1]) ;
}
int get_max(int l, int r)
{
    int num = pw[r - l + 1] ;
    return max(mx[l][num], mx[r - (1 << num) + 1][num]) ;
}
void init(int n, vector<int> a)
{
    for(int i = 0 ; i < n ; i++)
        if(a[i] != i + 1)flag1 = 1 ;
    if(!flag1)return ;
    if(n > 2000)flag2 = 1 ;
    else
    {
        for(int i = 0 ; i < n ; i++)
        {
            for(int j = i - 1 ; j >= 0 ; j--)
                if(a[j] > a[i])
                {
                    gr[i].push_back(j) ;
                    break ;
                }
            for(int j = i + 1 ; j < a.size() ; j++)
                if(a[j] > a[i])
                {
                    gr[i].push_back(j) ;
                    break ;
                }
        }
        for(int i = 0 ; i < n ; i++)
        {
            bfs(i) ;
            build_sparce_table(i) ;
        }
        return ;
    }
    build_sparce(a) ;
    for(int i = 0 ; i < n ; i++)
    {
        int l1 = -1, r1 = i, l2 = i, r2 = n ;
        while(l1 + 1 < r1)
        {
            int mid = (l1 + r1) >> 1 ;
            if(get_max(mid, i) > a[i])l1 = mid ;
            else r1 = mid ;
        }
        if(l1 != -1)gr[i].push_back(l1) ;
        while(l2 + 1 < r2)
        {
            int mid = (l2 + r2) >> 1 ;
            if(a[i] < get_max(i, mid))r2 = mid ;
            else l2 = mid ;
        }
        if(r2 != n)gr[i].push_back(r2) ;
    }
}
int minimum_jumps(int a, int b, int c, int d)
{
    if(!flag1)
    {
        if(a <= c && c <= b || a <= d && d <= b || c <= a && a <= d || a <= d && d <= b)return 0 ;
        if(c - b > 0)return c - b ;
        else return -1 ;
    }
    if(!flag2)
    {
        int ans = 1e9 ;
        for(int i = a ; i <= b ; i++)
        {
            ans = min(ans, get_min(c, d, i)) ;
        }
        if(ans == 1e9)ans = -1 ;
        return ans ;
    }
    if(!flag3)
    {
        return more_bfs(a, b, c, d) ;
    }
}
//signed main()
//{
//    ios_base::sync_with_stdio( 0 ) ;
//    cin.tie( 0 ) ;
//    cout.tie( 0 ) ;
//    int n, q ;
//    cin >> n >> q ;
//    vector<int> v(n) ;
//    for(int i = 0 ; i < n ; i++)
//        cin >> v[i] ;
//    init(n, v) ;
//    while(q--)
//    {
//        int a, b, c, d ;
//        cin >> a >> b >> c >> d ;
//        cout << minimum_jumps(a, b, c, d) << '\n' ;
//    }
//    return 0 ;
//}

Compilation message (stderr)

jumps.cpp: In function 'void build_sparce(std::vector<int>)':
jumps.cpp:71:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   71 |     for(int i = 0 ; i < a.size() ; i++)
      |                     ~~^~~~~~~~~~
jumps.cpp: In function 'void init(int, std::vector<int>)':
jumps.cpp:98:35: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   98 |             for(int j = i + 1 ; j < a.size() ; j++)
      |                                 ~~^~~~~~~~~~
jumps.cpp: In function 'int minimum_jumps(int, int, int, int)':
jumps.cpp:136:19: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
  136 |         if(a <= c && c <= b || a <= d && d <= b || c <= a && a <= d || a <= d && d <= b)return 0 ;
      |            ~~~~~~~^~~~~~~~~
jumps.cpp:136:59: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
  136 |         if(a <= c && c <= b || a <= d && d <= b || c <= a && a <= d || a <= d && d <= b)return 0 ;
      |                                                    ~~~~~~~^~~~~~~~~
jumps.cpp:136:79: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
  136 |         if(a <= c && c <= b || a <= d && d <= b || c <= a && a <= d || a <= d && d <= b)return 0 ;
      |                                                                        ~~~~~~~^~~~~~~~~
jumps.cpp:154:1: warning: control reaches end of non-void function [-Wreturn-type]
  154 | }
      | ^

• Subtask 1: 4 / 4
• Subtask 2: 8 / 8
• Subtask 3: 13 / 13
• Subtask 4: 12 / 12
• Subtask 5: 0 / 23
• Subtask 6: 0 / 21
• Subtask 7: 0 / 19