Submission #793526

#	Time	Username	Problem	Language	Result	Execution time	Memory
793526		mathematik	Dungeons Game (IOI21_dungeons)	C++17	37 / 100	3775 ms	1898560 KiB

dungeons

    #include "dungeons.h"
    #include <bits/stdc++.h>
    #define ll long long
     
    using namespace std;
     
    int binary_index[16][400001][25];//index, +, max excluded
    int binary_add[16][400001][25];
    int binary_max[16][400001][25];
     
    ll min(int a, ll b) {
    	return a < b ? a : b;
    }
     
    int N;
    vector<int> S, P, W, L;
     
    int safe_add(int a, int b) {
    	if (a > INT_MAX - b)
    		return INT_MAX;
    	return a + b;
    }
     
    int safe_sub(int a, int b) {
    	return max(a - b, 0);
    }
     
    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] = INT_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--)
    		{
    			if (binary_max[r][x][s] > t) {
    				t += binary_add[r][x][s];
    				x = binary_index[r][x][s];
    			}
    		}
    	}
    	t += binary_add[15][x][24];
    	return t;
    }

• Subtask 1: 11 / 11
• Subtask 2: 26 / 26
• Subtask 3: 0 / 13
• Subtask 4: 0 / 12
• Subtask 5: 0 / 27
• Subtask 6: 0 / 11