QOJ.ac
QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#722565 | #9576. Ordainer of Inexorable Judgment | ucup-team2179 | WA | 0ms | 4352kb | C++20 | 4.0kb | 2024-11-07 19:33:34 | 2024-11-07 19:33:35 |
Judging History
你现在查看的是最新测评结果
- [2024-12-23 14:23:26]
- hack成功,自动添加数据
- (/hack/1303)
- [2024-12-06 11:32:56]
- hack成功,自动添加数据
- (/hack/1271)
- [2024-11-14 21:58:28]
- hack成功,自动添加数据
- (/hack/1181)
- [2024-11-07 19:33:34]
- 提交
answer
#include <bits/stdc++.h>
using namespace std;
const double eps = 1e-8; // 根据题目精度要求进行修改
const double PI = acos(-1.0); // pai, 3.1415916....
int sgn(double x)
{ // 进行判断, 提高精度
if (fabs(x) < eps)
return 0; // x == 0, 精度范围内的近似相等
return x > 0 ? 1 : -1; // 返回正负
}
// 点和向量<---------------------------------------------->
// Need: sgn()
typedef struct Point
{
double x, y;
Point(double x = 0, double y = 0) : x(x), y(y) {} // 构造函数, 初始值为 0
// 重载运算符
// 点 - 点 = 向量(向量AB = B - A)
Point operator-(const Point &B) const { return Point(x - B.x, y - B.y); }
// 点 + 点 = 点, 点 + 向量 = 向量, 向量 + 向量 = 向量
Point operator+(const Point &B) const { return Point(x + B.x, y + B.y); }
// 向量 × 向量 (叉积)
double operator^(const Point &B) const { return x * B.y - y * B.x; }
// 向量 · 向量 (点积)
double operator*(const Point &B) const { return x * B.x + y * B.y; }
} Vector;
struct Circle
{
Point c;
double r;
Circle(Point c = Point(), double r = 0) : c(c), r(r) {}
};
double len(Vector A) { return sqrt(A * A); }
Vector Rotate(Vector A, double b)
{
Vector B(sin(b), cos(b));
return Vector(A ^ B, A * B);
}
// 点到圆的切线
// 过点p到圆c的切线,v[i]是第i条切线
vector<Vector> get_tangents(Point p, Circle C)
{
Vector u = C.c - p;
double dist = len(u);
if (dist < C.r)
return {}; // 点在内部,没有切线
else if (sgn(dist - C.r) == 0)
{ // p在圆上,只有一条切线
return {Rotate(u, PI / 2)};
}
else
{ // 否则是两条切线
double ang = asin(C.r / dist);
return {Rotate(u, -ang), Rotate(u, +ang)};
}
}
// 判断点在直线的哪边
// Need: (-, ^), sgn()
// 点在直线上, 返回 0 (三点共线)
// 点在直线的逆时针方向, 返回 1
// 点在直线的顺时针方向, 返回 -1
// 点 a, b (向量ab) 所在的直线和点 c
// 使用的时候要注意 a 和 b 的顺序, 有时顺序不同, 结果不同
int Cross(Point a, Point b, Point c) { return sgn((b - a) ^ (c - a)); }
Point a[105];
int n, x, y, d, t;
Circle c;
double col(int op)
{
for (int i = 1; i <= n; i++)
{
vector<Vector> t = get_tangents(a[i], c);
Point q;
for (auto [x, y]: t)
{
x += a[i].x, y += a[i].y;
if (Cross({x, y}, a[i], {0, 0}) == op) q = {x, y};
}
int f = 1;
for (int j = 1; j <= n; j++)
{
if (i == j) continue;
if (Cross(q, a[i], a[j]) == op)
{
f = 0;
break;
}
}
if (f)
{
double jd = atan2(a[i].y - q.y, a[i].x - q.x);
return jd;
}
}
return 0.0;
}
void solve()
{
cin >> n >> x >> y >> d >> t;
c = {{0, 0}, (double)d};
double cs = atan2(y, x);
for (int i = 1; i <= n; i++) cin >> a[i].x >> a[i].y;
// 开始受到伤害
double s = col(-1), e = col(1);
if (s > e) e += 2 * PI;
if (cs < 0) cs += 2 * PI;
double zh = (int)(t / (2 * PI));
double sh = t - (2 * PI) * zh;
double ans = zh * (e - s);
if (cs < s) ans += max(0.0, min(e, cs + sh) - s);
else if (cs < e) ans += max(0.0, min(e, cs + sh) - cs);
else
{
s += 2 * PI, e += 2 * PI;
ans += max(0.0, min(e, cs + sh) - s);
}
cout << fixed << setprecision(10) << ans << '\n';
}
signed main()
{
// freopen("D:\\3022244240\\vscode\\txt\\in.txt", "r", stdin);
// freopen("D:\\3022244240\\vscode\\txt\\out.txt", "w", stdout);
ios::sync_with_stdio(false);
cin.tie(0); cout.tie(0);
int T = 1;
// cin >> T;
while (T--) solve();
return 0;
}
/*
3 -10000 -10000 10000 10000
-10000 -9999
-10000 -10000
-9999 -10000
*/
Details
Tip: Click on the bar to expand more detailed information
Test #1:
score: 100
Accepted
time: 0ms
memory: 4184kb
input:
3 1 0 1 1 1 2 2 1 2 2
output:
1.0000000000
result:
ok found '1.0000000', expected '1.0000000', error '0.0000000'
Test #2:
score: 0
Accepted
time: 0ms
memory: 4200kb
input:
3 1 0 1 2 1 2 2 1 2 2
output:
1.5707963268
result:
ok found '1.5707963', expected '1.5707963', error '0.0000000'
Test #3:
score: 0
Accepted
time: 0ms
memory: 4352kb
input:
3 1 0 1 10000 1 2 2 1 2 2
output:
2500.7077522575
result:
ok found '2500.7077523', expected '2500.7077523', error '0.0000000'
Test #4:
score: 0
Accepted
time: 0ms
memory: 4324kb
input:
3 10000 10000 1 10000 10000 9999 10000 10000 9999 10000
output:
0.3842413003
result:
ok found '0.3842413', expected '0.3842413', error '0.0000000'
Test #5:
score: 0
Accepted
time: 0ms
memory: 4308kb
input:
3 -10000 -10000 10000 10000 -10000 -9999 -10000 -10000 -9999 -10000
output:
2500.2406700096
result:
ok found '2500.2406700', expected '2500.2406700', error '0.0000000'
Test #6:
score: 0
Accepted
time: 0ms
memory: 4316kb
input:
4 1 0 1 10000 -2 3400 -4 10000 -4 -10000 -2 -3400
output:
4999.2191154087
result:
ok found '4999.2191154', expected '4999.2191154', error '0.0000000'
Test #7:
score: 0
Accepted
time: 0ms
memory: 4208kb
input:
4 1 0 1 10000 -2 3300 -4 10000 -4 -10000 -2 -3300
output:
4999.2003918548
result:
ok found '4999.2003919', expected '4999.2003919', error '0.0000000'
Test #8:
score: 0
Accepted
time: 0ms
memory: 4320kb
input:
4 -3040 2716 2147 2 -9033 -8520 -8999 -8533 -8988 -8511 -9004 -8495
output:
0.3508300583
result:
ok found '0.3508301', expected '0.3508301', error '0.0000000'
Test #9:
score: 0
Accepted
time: 0ms
memory: 4256kb
input:
3 8168 -766 1549 1256 -3951 -6425 -3874 -6439 -3911 -6389
output:
84.8328611610
result:
ok found '84.8328612', expected '84.8328612', error '0.0000000'
Test #10:
score: 0
Accepted
time: 0ms
memory: 4308kb
input:
8 2977 -3175 8766 2 -4868 7759 -4867 7925 -4867 7950 -4886 7952 -4979 7953 -5048 7877 -5003 7761 -4936 7759
output:
0.3278606469
result:
ok found '0.3278606', expected '0.3278606', error '0.0000000'
Test #11:
score: 0
Accepted
time: 0ms
memory: 4300kb
input:
13 -1715 -4640 267 8651 272 6659 264 6660 208 6664 108 6625 107 6621 93 6564 90 6551 90 6485 124 6474 219 6477 283 6525 288 6591 286 6657
output:
153.5896227847
result:
ok found '153.5896228', expected '153.5896228', error '0.0000000'
Test #12:
score: 0
Accepted
time: 0ms
memory: 4316kb
input:
8 -9743 -7629 775 7 -194 981 -191 1720 -193 1845 -705 1929 -959 1950 -1131 1894 -1151 1604 -1031 1020
output:
2.0460062044
result:
ok found '2.0460062', expected '2.0460062', error '0.0000000'
Test #13:
score: 0
Accepted
time: 0ms
memory: 4320kb
input:
9 -6770 -1426 3491 1918 -2118 2886 -2063 3245 -2122 3709 -2129 3737 -2850 3718 -2984 3650 -3042 3462 -3028 2972 -2688 2888
output:
822.2411849637
result:
ok found '822.2411850', expected '822.2411850', error '0.0000000'
Test #14:
score: 0
Accepted
time: 0ms
memory: 4260kb
input:
12 1616 -7384 5256 10 -5607 2623 -5838 2843 -6117 2986 -6592 3169 -7129 3120 -7334 3069 -7406 2295 -7369 1712 -7091 1287 -6312 1252 -5596 1592 -5457 2088
output:
3.0387653771
result:
ok found '3.0387654', expected '3.0387654', error '0.0000000'
Test #15:
score: 0
Accepted
time: 0ms
memory: 4308kb
input:
10 -4546 5056 639 2996 4851 -3506 6078 -3725 6629 -3674 6775 -3296 6743 -2137 6585 -1866 5334 -1837 4950 -2020 4873 -2260 4852 -3240
output:
262.4239690789
result:
ok found '262.4239691', expected '262.4239691', error '0.0000000'
Test #16:
score: -100
Wrong Answer
time: 0ms
memory: 4256kb
input:
20 4847 -6818 2502 2 -2164 -3844 -2453 -3826 -4654 -3818 -5073 -3829 -5212 -3833 -5828 -3921 -5889 -6065 -5896 -6716 -5877 -7349 -5855 -7457 -5619 -7711 -5485 -7786 -3743 -7809 -2345 -7747 -2075 -7682 -1960 -7364 -1900 -7015 -1901 -6391 -1922 -4091 -1968 -4028
output:
1.4901645896
result:
wrong answer 1st numbers differ - expected: '0.0000000', found: '1.4901646', error = '1.4901646'