QOJ.ac
QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#788152 | #9668. Isoball: 2D Version | TJ_Andeviking# | WA | 4ms | 3664kb | C++20 | 2.5kb | 2024-11-27 16:04:44 | 2024-11-27 16:04:45 |
Judging History
answer
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using pii = pair<int, int>;
#define range(x) (x).begin(), (x).end()
struct Point {
ll x, y;
Point() {};
Point(ll x, ll y)
: x(x), y(y)
{
}
Point operator-(Point B)
{
return Point(x - B.x, y - B.y);
}
};
ll Cross(Point a, Point b)
{
return a.x * b.y - a.y * b.x;
}
int sgn(ll x)
{
if (x < 0)
return -1;
else if (x == 0)
return 0;
else
return 1;
}
ll Dot(Point a, Point b)
{
return a.x * b.x + a.y * b.y;
}
bool Cross_segment(Point a, Point b, Point c, Point d)
{
// cout << c.x << ' ' << c.y << ' ' << d.x << ' ' << d.y << '\n';
ll c1 = Cross(b - a, c - a), c2 = Cross(b - a, d - a);
ll d1 = Cross(d - c, a - c), d2 = Cross(d - c, b - c);
bool flag = sgn(c1) * sgn(c2) <= 0 && sgn(d1) * sgn(d2) <= 0;
if (!flag)
return false;
if (Cross(b - a, c - d) == 0) {
if (a.x > b.x)
swap(a, b);
if (c.x >= a.x && c.x <= b.x)
return true;
if (d.x >= a.x && d.x <= b.x)
return true;
return false;
}
return true;
}
void solve()
{
int x, y, r, vx, vy;
cin >> x >> y >> r >> vx >> vy;
int lx, ly, rx, ry;
cin >> lx >> ly >> rx >> ry;
lx += r, ly += r;
rx -= r, ry -= r;
if (rx < lx || ry < ly) {
cout << "No\n";
return;
}
Point a(x, y);
ll cnt = 0;
if (vx && vy)
cnt = max(10000000 / abs(vx), 10000000 / abs(vy));
else if (vx)
cnt = 10000000 / abs(vx);
else
cnt = 10000000 / abs(vy);
x += cnt * vx;
y += cnt * vy;
Point b(x, y);
// cout << a.x << ' ' << a.y << ' ' << b.x << ' ' << b.y << '\n';
Point cka(lx, ly), ckb(lx, ry);
if (Cross_segment(a, b, cka, ckb)) {
cout << "Yes\n";
return;
}
ckb.x = rx, ckb.y = ly;
if (Cross_segment(a, b, cka, ckb)) {
cout << "Yes\n";
return;
}
ckb.x = rx, ckb.y = ry;
cka.x = lx, cka.y = ry;
if (Cross_segment(a, b, cka, ckb)) {
cout << "Yes\n";
return;
}
cka.x = rx, cka.y = ly;
if (Cross_segment(a, b, cka, ckb)) {
cout << "Yes\n";
return;
}
cout << "No\n";
}
int main()
{
ios::sync_with_stdio(false);
cin.tie(0);
cout.tie(0);
int t = 1;
cin >> t;
while (t--)
solve();
return 0;
}
Details
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Test #1:
score: 100
Accepted
time: 0ms
memory: 3584kb
input:
5 0 0 1 1 0 2 -2 6 2 0 0 1 1 0 2 0 6 2 0 0 1 1 1 1 1 3 3 0 0 1 -1 -1 1 1 3 3 0 0 1 -1 1 -5 -5 5 5
output:
Yes No Yes No Yes
result:
ok 5 lines
Test #2:
score: 0
Accepted
time: 0ms
memory: 3656kb
input:
2 0 0 1000000 1000000 1000000 -1000000 -1000000 1000000 1000000 1000000 1000000 1 -1000000 -1000000 -1000000 -1000000 -999999 -999999
output:
Yes No
result:
ok 2 lines
Test #3:
score: -100
Wrong Answer
time: 4ms
memory: 3664kb
input:
10000 10 -10 10 1 -2 -13 -8 6 -1 -7 -10 3 3 1 -3 -12 14 -9 -9 -2 4 4 -3 -11 7 -8 12 -3 1 8 -1 0 -11 1 19 13 -1 8 9 -3 2 11 -5 17 4 -2 -7 3 -3 5 -12 -14 10 1 0 3 6 -5 3 -11 2 2 16 4 9 6 5 -4 -8 -11 18 -1 0 0 8 4 -2 -10 -15 1 12 8 4 4 5 2 -17 3 8 7 -3 7 10 -4 0 1 0 10 20 -6 -10 5 -3 -1 -20 -20 15 7 5 ...
output:
No No No No No Yes No No No No No Yes No Yes No No Yes No Yes No No No No No Yes No No No Yes No No No Yes No No Yes No No No No No No No No No No No No Yes No No No No No No No No No Yes Yes No No Yes Yes Yes No No No No No No No No No No No No No No No No No No No No No No No No No No No No No Yes...
result:
wrong answer 371st lines differ - expected: 'No', found: 'Yes'