Submission #793536

#TimeUsernameProblemLanguageResultExecution timeMemory
793536mathematikDungeons Game (IOI21_dungeons)C++17
37 / 100
3979 ms1898560 KiB
#include "dungeons.h" #include <bits/stdc++.h> #define ll long long using namespace std; int binary_index[16][400001][25];//index, +, max excluded uint binary_add[16][400001][25]; uint binary_max[16][400001][25]; ll min(int a, ll b) { return a < b ? a : b; } int N; vector<int> S, P, W, L; uint safe_add(uint a, uint b) { if (a + b < a) return UINT_MAX; return a + b; } uint safe_sub(uint a, uint b) { if (a < b) return 0; return a - b; } void init(int n, vector<int> s, vector<int> p, vector<int> w, vector<int> l) { s.push_back(0); p.push_back(0); w.push_back(n); l.push_back(n); n++; N = n; S = s, P = p, W = w, L = l; for (int range = 0; range < 16; range++) { ll r = 1 << (range + 9); for (int i = 0; i < n; i++) { if (s[i] <= r) { binary_index[range][i][0] = w[i]; binary_add[range][i][0] = s[i]; binary_max[range][i][0] = UINT_MAX; } else { binary_index[range][i][0] = l[i]; binary_add[range][i][0] = p[i]; binary_max[range][i][0] = s[i]; } } for (int i = 1; i < 25; i++) { for (int ind = 0; ind < n; ind++) { int pointer = binary_index[range][ind][i - 1]; binary_index[range][ind][i] = binary_index[range][pointer][i - 1]; binary_add[range][ind][i] = safe_add(binary_add[range][ind][i - 1], binary_add[range][pointer][i - 1]); binary_max[range][ind][i] = min(binary_max[range][ind][i - 1], safe_sub(binary_max[range][pointer][i - 1], binary_add[range][ind][i - 1])); } } } } long long simulate(int x, int z) { ll t = z; while (t < 512 && x != N - 1) { if (t >= S[x]) { t += S[x]; x = W[x]; } else { t += P[x]; x = L[x]; } } for (int r = 0; r < 15; r++) { for (int s = 24; s >= 0; s--) { while (binary_max[r][x][s] > t && binary_add[r][x][s] != UINT_MAX && x != N - 1) { t += binary_add[r][x][s]; x = binary_index[r][x][s]; } } } t += binary_add[15][x][24]; return t; }
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