This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
#include "jumps.h"
using namespace std;
// #define int long long
#define ll long long
#define ff first
#define ss second
#define pint pair < int , int >
#define fast ios_base::sync_with_stdio(NULL); cin.tie(NULL)
typedef vector < int > vint;
const int inf = 1e9 + 9;
const int mxn = 2e5 + 5;
const int mod = 1e9 + 7;
int n;
int h[mxn] , le[mxn] , ri[mxn];
int inv[mxn];
int spx[19][mxn] , spn[19][mxn];
vint v;
void init(int N , vint H) {
n = N;
for (int i = 0; i < n; i++) {
h[i] = H[i];
inv[h[i]] = i;
}
for (int i = 0; i < n; i++) {
while (v.size() > 0 && v.back() < h[i]) {
ri[v.back()] = h[i];
v.pop_back();
}
if (v.size() > 0) le[h[i]] = v.back();
v.push_back(h[i]);
}
// for (int i = 0; i < n; i++) {
// spx[0][h[i]] = max(le[h[i]] , ri[h[i]]);
// spn[0][h[i]] = min(le[h[i]] , ri[h[i]]);
// if (spn[0][h[i]] == 0) spn[0][h[i]] = spx[0][h[i]];
// }
// for (int j = 1; j < 19; j++) {
// for (int i = 0; i < n; i++) {
// spx[j][h[i]] = spx[j-1][spx[j-1][h[i]]];
// spn[j][h[i]] = spn[j-1][spn[j-1][h[i]]];
// }
// }
}
int minimum_jumps(int a , int b , int c , int d) {
// if (h[a] > h[d]) return -1;
// int dis = 0;
// for (int i = 18; i >= 0; i--) {
// if (spx[i][h[a]] > h[d] || spx[i][h[a]] == 0) continue;
// if (spx[i][h[a]] == h[d]) return (1 << i);
// int t = minimum_jumps(inv[spx[i][h[a]]] , b , c , d);
// return (t == -1) ? t : ((1<<i) + t);
// }
// for (int i = 18; i >= 0; i--) {
// if (spn[i][h[a]] > h[d] || spn[i][h[a]] == 0) continue;
// if (spn[i][h[a]] == h[d]) return (1 << i);
// int t = minimum_jumps(inv[spn[i][h[a]]] , b , c , d);
// return (t == -1) ? t : ((1<<i) + t);
// }
return -1;
}
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