Submission #397397

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
397397	2021-05-02 03:15:06	KoD	Love Polygon (BOI18_polygon)	C++17	100 / 100	233 ms	14508 KiB

polygon

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
#include <bits/stdc++.h>
template <class T>
using Vec = std::vector<T>;
int main() {
    int N;
    std::cin >> N;
    if (N % 2 == 1) {
        std::cout << -1 << '\n';
        return 0;
    }
    Vec<int> to(N);
    {
        Vec<std::string> U(N), V(N);
        for (int i = 0; i < N; ++i) {
            std::cin >> U[i] >> V[i];
        }    
        auto cmp = U;
        std::sort(cmp.begin(), cmp.end());
        for (int i = 0; i < N; ++i) {
            const int u = std::lower_bound(cmp.cbegin(), cmp.cend(), U[i]) - cmp.cbegin();
            const int v = std::lower_bound(cmp.cbegin(), cmp.cend(), V[i]) - cmp.cbegin();
            to[u] = v;
        }
    }
    Vec<int> deg(N);
    for (int i = 0; i < N; ++i) {
        deg[to[i]] += 1;
    }
 
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

• Subtask 1: 21 / 21
• Subtask 2: 25 / 25
• Subtask 3: 29 / 29
• Subtask 4: 25 / 25