Submission #198103

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
198103	2020-01-24 18:00:18	model_code	Building Skyscrapers (CEOI19_skyscrapers)	C++17	100 / 100	2782 ms	324140 KiB

skyscrapers

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/* Constructs the minimum required grid graph.
   Tracks connected components using union-find.
   Decides which cells may be deleted based on neighbourhoods,
   updates that information when necessary and keeps these cells
   in a set<>.
   O(N log N)
*/
#include <bits/stdc++.h>
using namespace std;
class HashPair {
    static inline size_t hash_combine(size_t h_first, size_t h_second) {
        return h_first ^ (h_second + 0x9e3779b9 + (h_first << 6) + (h_second >> 2));
    }
    static inline size_t hash_int(unsigned int x) {
        x = ((x >> 16) ^ x) * 0x45d9f3b;
        x = ((x >> 16) ^ x) * 0x45d9f3b;
        x = (x >> 16) ^ x;
        return x;
    }
public:
    size_t operator() (const pair<int, int> & p) const {
        size_t h_first  = hash_int(p.first);
        size_t h_second = hash_int(p.second);
        return hash_combine(h_first, h_second);
    }
};
 
 
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• Subtask 1: 8 / 8
• Subtask 2: 14 / 14
• Subtask 3: 12 / 12
• Subtask 4: 17 / 17
• Subtask 5: 20 / 20
• Subtask 6: 10 / 10
• Subtask 7: 19 / 19