| # | Time | Username | Problem | Language | Result | Execution time | Memory |
|---|---|---|---|---|---|---|---|
| 860205 | nnhzzz | Rainforest Jumps (APIO21_jumps) | C++14 | 0 ms | 0 KiB |
This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
// cre: Nguyen Ngoc Hung - Train VOI 2024 :>
#include <algorithm>
#include <bitset>
#include <complex>
#include <deque>
#include <exception>
#include <fstream>
#include <functional>
#include <iomanip>
#include <ios>
#include <iosfwd>
#include <iostream>
#include <istream>
#include <iterator>
#include <limits>
#include <list>
#include <locale>
#include <map>
#include <memory>
#include <new>
#include <numeric>
#include <ostream>
#include <queue>
#include <set>
#include <unordered_set>
#include <sstream>
#include <stack>
#include <stdexcept>
#include <streambuf>
#include <string>
#include <typeinfo>
#include <utility>
#include <valarray>
#include <vector>
#include <cstring>
#include <unordered_map>
#include <cmath>
#include <array>
#include <cassert>
#include <random>
using namespace std;
#define __nnhzzz__ signed main()
#define BIT(i,j) ((i>>j)&1LL)
#define MASK(i) (1LL<<i)
#define ALL(x) (x).begin(),(x).end()
#define SZ(x) (int)(x).size()
#define fi first
#define se second
#define ll long long
#define vi vector<int>
#define vvi vector<vi>
#define pii pair<int,int>
#define vpii vector<pii>
#define REPDIS(i,be,en,j) for(int i = (be); i<=(en); i+=j)
#define REPD(i,be,en) for(int i = (be); i>=(en); i--)
#define REP(i,be,en) for(int i = (be); i<=(en); i++)
//-------------------------------------------------------------//
const int oo = 1e9,LOG = 18,MAXN = 5e5+7,N = 1e2+3;
const int MOD = 1e9+7,MOD1 = 1e9+207,MOD2 = 1e9+407,MOD3 = 998244353;
//-------------------------------------------------------------//
template<typename T1, typename T2> bool mini(T1 &a, T2 b){if(a>b){a=b;return true;}return false;}
template<typename T1, typename T2> bool maxi(T1 &a, T2 b){if(a<b){a=b;return true;}return false;}
template<typename T> T gcd(T a, T b) { while(b) { a %= b; swap(a,b); } return a; }
template<typename T> T lcm(T a, T b) { return a/gcd(a,b)*b; }
/*
----------------------------------------------------------------
END OF TEMPLATE
----------------------------------------------------------------
Nguyen Ngoc Hung - nnhzzz
Training for VOI24 gold medal
----------------------------------------------------------------
*/
int a[MAXN],hi[MAXN][LOG],rgt[MAXN][LOG],ma[MAXN][LOG];
int n;
#define combine(x,y) (a[(x)]<a[(y)]?(y):(x))
int get(int l, int r){
int k = log2(r-l+1);
return combine(ma[l][k],ma[r-MASK(k)+1][k]);
}
bool F(int i, int l, int r){
return (i>=l && i<=r);
}
void init(int N, vi arr){
n = N;
REP(i,1,n) a[i] = arr[i-1];
a[0] = a[n+1] = n+1;
stack<int> st; st.push(0);
REP(i,1,n){
while(a[st.top()]<a[i]) st.pop();
hi[i][0] = st.top(); st.push(i);
}
while(SZ(st)!=0) st.pop(); st.push(n+1);
REPD(i,n,1){
while(a[st.top()]<a[i]) st.pop();
rgt[i][0] = st.top(); st.push(i);
}
rgt[0][0] = rgt[n+1][0] = n+1;
REP(i,1,n){
ma[i][0] = i;
hi[i][0] = combine(hi[i][0],rgt[i][0]);
}
REP(j,1,LOG-1){
REP(i,0,n+1){
hi[i][j] = hi[hi[i][j-1]][j-1];
rgt[i][j] = rgt[rgt[i][j-1]][j-1];
if(i+MASK(j)-1>n) continue;
ma[i][j] = combine(ma[i][j-1],ma[i+MASK((j-1))][j-1]);
}
}
}
// 3 2 1 6 4 5 7
// 2-4 6-7
int minimum_jumps(int A, int B, int C, int D){
++A; ++B; ++C; ++D;
int CD = get(C,D),BC = get(B,C-1);
if(a[BC]>a[CD]) return -1;
int l = A,r = B,pos = A;
while(l<=r){
int mid = (l+r)>>1;
if(a[get(mid,B)]<a[CD]){
pos = mid;
r = mid-1;
}else{
l = mid+1;
}
}
pos = get(pos,B);
if(F(rgt[pos][0],C,D)) return 1;
int res = 0;
REPD(i,LOG-1,0){
int newpos = hi[pos][i];
if(rgt[newpos][0]<C){
pos = newpos;
res += MASK(i);
}
}
int newpos = hi[pos][0];
if(rgt[0][newpos]<=D){
pos = newpos; ++res;
if(F(pos,C,D)) return res+1;
}
REPD(i,LOG-1,0){
newpos = rgt[pos][i];
if(newpos<C){
pos = newpos;
res += MASK(i);
}
}
return res+1;
}
void solve(){
init(7,{3,2,1,6,4,5,7});
cout << minimum_jumps(1,3,5,6); // 2-4 6-7
}
__nnhzzz__{
ios::sync_with_stdio(0);
cin.tie(0); cout.tie(0);
#define name "test"
if(fopen(name".inp","r")){
freopen(name".inp","r",stdin);
freopen(name".out","w",stdout);
}
#define name1 "nnhzzz"
if(fopen(name1".inp","r")){
freopen(name1".inp","r",stdin);
freopen(name1".out","w",stdout);
}
int test = 1;
while(test--){
solve();
}
cerr << "\nTime elapsed: " << 1000*clock()/CLOCKS_PER_SEC << "ms\n";
return 0;
}