제출 #972370

#제출 시각아이디문제언어결과실행 시간메모리
972370Syrius밀림 점프 (APIO21_jumps)C++14
0 / 100
4 ms4696 KiB
#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++) { if (v.size() > 0) { while (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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