Submission #369573

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
369573	2021-02-21 22:31:10	ijxjdjd	Tracks in the Snow (BOI13_tracks)	C++14	89.06 / 100	2117 ms	530860 KiB

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#include <bits/stdc++.h>
#define FR(i, N) for (int i = 0; i < int(N); i++)
#define all(x) begin(x), end(x)
using namespace std;
using ll = long long;
struct custom_hash {
    static uint64_t splitmix64(uint64_t x) {
        // http://xorshift.di.unimi.it/splitmix64.c
        x += 0x9e3779b97f4a7c15;
        x = (x ^ (x >> 30)) * 0xbf58476d1ce4e5b9;
        x = (x ^ (x >> 27)) * 0x94d049bb133111eb;
        return x ^ (x >> 31);
    }
    size_t operator()(pair<uint64_t, uint64_t> x) const {
        static const uint64_t FIXED_RANDOM = chrono::steady_clock::now().time_since_epoch().count();
        return splitmix64(x.first + FIXED_RANDOM) + splitmix64(x.second+FIXED_RANDOM);
    }
};
const int MAXN = 4000 + 5;
int par[MAXN*MAXN];
int board[MAXN*MAXN];
int seen[MAXN*MAXN];
int rk[MAXN*MAXN];
int sz = 0;
int dist[MAXN*MAXN];
unordered_set<pair<int, int>, custom_hash> already;
 
 
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• Subtask 1: 30 / 30
• Subtask 2: 59.0625 / 70