結果
| 問題 |
No.2180 Comprehensive Line Segments
|
| コンテスト | |
| ユーザー |
|
| 提出日時 | 2023-02-06 13:55:03 |
| 言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
WA
|
| 実行時間 | - |
| コード長 | 2,100 bytes |
| コンパイル時間 | 1,648 ms |
| コンパイル使用メモリ | 193,348 KB |
| 最終ジャッジ日時 | 2025-02-10 11:20:28 |
|
ジャッジサーバーID (参考情報) |
judge4 / judge4 |
(要ログイン)
| ファイルパターン | 結果 |
|---|---|
| sample | AC * 4 |
| other | AC * 22 WA * 3 |
コンパイルメッセージ
main.cpp: In function ‘int main()’:
main.cpp:29:8: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
29 | scanf("%d", &n);
| ~~~~~^~~~~~~~~~
main.cpp:30:36: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
30 | for (int i = 0; i < n; ++i) scanf("%d %d", &p[i].x, &p[i].y);
| ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
ソースコード
#include <bits/stdc++.h>
#define File(a) freopen(a ".in", "r", stdin), freopen(a ".out", "w", stdout)
using uint = unsigned;
using ll = long long;
using ull = unsigned long long;
using pii = std::pair<int, int>;
const int N = 12;
class Point {
public:
using Vector = Point;
int x, y;
Point(int x = 0, int y = 0) : x(x), y(y) {}
friend Vector operator-(const Point &a, const Point &b) { return Vector(a.x - b.x, a.y - b.y); }
} p[N];
using Vector = Point;
int cross(const Vector &a, const Vector &b);
int sgn(int x);
void upd(int &a, const int &b) { a = std::min(a, b); }
int dp[1 << N][N][N];
int n;
int main() {
scanf("%d", &n);
for (int i = 0; i < n; ++i) scanf("%d %d", &p[i].x, &p[i].y);
memset(dp, 0x3f, sizeof(dp));
for (int i = 0; i < n; ++i) {
for (int j = 0; j < n; ++j) {
if (i == j) continue;
dp[(1 << i) | (1 << j)][i][j] = 1;
}
}
for (int s = 0; s < 1 << n; ++s) {
for (int i = 0; i < n; ++i) {
if (~s >> i & 1) continue;
for (int j = 0; j < n; ++j) {
if (~s >> j & 1) continue;
int now = dp[s][i][j];
for (int k = 0; k < n; ++k) {
if (s >> k & 1) continue;
if (sgn(cross(p[j] - p[i], p[k] - p[j])) == 0)
upd(dp[s | (1 << k)][j][k], now);
else
upd(dp[s | (1 << k)][j][k], now + 1);
for (int l = 0; l < n; ++l) {
if (s >> l & 1) continue;
if (l == k) continue;
int s1 = sgn(cross(p[j] - p[i], p[k] - p[j]));
int s2 = sgn(cross(p[k] - p[j], p[l] - p[k]));
int s3 = sgn(cross(p[j] - p[i], p[l] - p[k]));
if (s1 == s2 && s2 == s3) upd(dp[s | (1 << k) | (1 << l)][k][l], now + 1);
}
}
}
}
}
int ans = n;
for (int i = 0; i < n; ++i) {
for (int j = 0; j < n; ++j) {
if (i == j) continue;
ans = std::min(ans, dp[(1 << n) - 1][i][j]);
}
}
printf("%d\n", ans);
return 0;
}
int cross(const Vector &a, const Vector &b) { return a.x * b.y - a.y * b.x; }
int sgn(int x) { return (x == 0) ? 0 : ((x > 0) ? 1 : -1); }