QOJ.ac
QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#824628 | #9776. Best Friend, Worst Enemy | ucup-team5052# | WA | 499ms | 14576kb | C++17 | 2.2kb | 2024-12-21 14:58:54 | 2024-12-21 14:59:02 |
Judging History
answer
#include <bits/stdc++.h>
using namespace std;
int n, x[400005], y[400005], d1[400005], d2[400005], cnt[400005], idx[400005], inv[400005];
vector <int> psv;
mt19937 rnd(chrono::steady_clock::now().time_since_epoch().count());
int main() {
cin >> n;
for (int i = 1;i <= n;i++) {
cin >> x[i] >> y[i];
}
int p[2][2];
p[0][0] = p[0][1] = p[1][0] = p[1][1] = 1;
long long cx = rnd() % 20000 + 1, cy = rnd() % 20000 + 1;
cx -= 10000; cy -= 10000;
for (int i = 1;i <= n;i++) idx[i] = i;
sort(idx + 1, idx + n + 1, [&](const int &i, const int &j) {
return x[i] * cx + y[i] * cy < x[j] * cx + y[j] * cy;
});
for (int i = 1;i <= n;i++) inv[idx[i]] = i;
memset(d1, 0x3f, sizeof(d1));
for (int i = 1;i <= n;i++) {
vector <int> nxt;
for (int j : psv) {
if (max(abs(x[i] - x[j]), abs(y[i] - y[j])) < d1[j] || abs(x[i] - x[j]) + abs(y[i] - y[j]) > d2[j]) cnt[j] = 0;
d1[j] = min(d1[j], max(abs(x[i] - x[j]), abs(y[i] - y[j])));
d2[j] = max(d2[j], abs(x[i] - x[j]) + abs(y[i] - y[j]));
if (d1[j] == max(abs(x[i] - x[j]), abs(y[i] - y[j])) && d2[j] == abs(x[i] - x[j]) + abs(y[i] - y[j])) cnt[j]++;
if (2 * d1[j] >= d2[j]) nxt.push_back(j);
}
swap(psv, nxt);
for (int k1 = 0;k1 < 2;k1++) {
for (int k2 = 0;k2 < 2;k2++) {
if ((2 * k1 - 1) * x[i] + (2 * k2 - 1) * y[i] > (2 * k1 - 1) * x[p[k1][k2]] + (2 * k2 - 1) * y[p[k1][k2]]) {
p[k1][k2] = i;
}
d2[i] = max(d2[i], (2 * (!k1) - 1) * x[i] + (2 * (!k2) - 1) * y[i] + (2 * k1 - 1) * x[p[k1][k2]] + (2 * k2 - 1) * y[p[k1][k2]]);
}
}
int pos = inv[i];
cnt[i] = 0;
for (int jj = max(1, pos - 200);jj <= min(n, pos + 200);jj++) {
int j = idx[jj];
if (j >= i) continue;
if (max(abs(x[i] - x[j]), abs(y[i] - y[j])) < d1[i] || abs(x[i] - x[j]) + abs(y[i] - y[j]) > d2[i]) cnt[i] = 0;
d1[i] = min(d1[i], max(abs(x[i] - x[j]), abs(y[i] - y[j])));
d2[i] = max(d2[i], abs(x[i] - x[j]) + abs(y[i] - y[j]));
if (d1[i] == max(abs(x[i] - x[j]), abs(y[i] - y[j])) && d2[i] == abs(x[i] - x[j]) + abs(y[i] - y[j])) cnt[i]++;
}
// cout << d1[i] << " " << d2[i] << endl;
if (2 * d1[i] >= d2[i]) psv.push_back(i);
int ans = 0;
for (int j : psv) ans += cnt[j];
cout << ans << endl;
}
return 0;
}
Details
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Test #1:
score: 100
Accepted
time: 0ms
memory: 13996kb
input:
2 1 5 1 10
output:
0 2
result:
ok 2 number(s): "0 2"
Test #2:
score: 0
Accepted
time: 0ms
memory: 9760kb
input:
4 2 5 5 3 5 7 8 5
output:
0 2 4 4
result:
ok 4 number(s): "0 2 4 4"
Test #3:
score: 0
Accepted
time: 2ms
memory: 9760kb
input:
9 3 4 3 6 4 3 4 7 5 5 6 3 6 7 7 4 7 6
output:
0 2 1 0 4 5 6 7 8
result:
ok 9 numbers
Test #4:
score: 0
Accepted
time: 1ms
memory: 9836kb
input:
13 3 5 4 4 4 5 4 6 5 3 5 4 5 5 5 6 5 7 6 4 6 5 6 6 7 5
output:
0 2 4 7 2 2 5 2 2 3 3 4 4
result:
ok 13 numbers
Test #5:
score: -100
Wrong Answer
time: 499ms
memory: 14576kb
input:
384010 200000 1000000 200000 1000001 199999 1000000 200001 1000000 200000 999999 200000 1000002 200002 1000000 200000 999998 199998 1000000 199997 1000000 200003 1000000 200000 999997 200000 1000003 199996 1000000 200004 1000000 200000 1000004 200000 999996 199995 1000000 200000 1000005 200000 99999...
output:
0 2 4 7 12 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0...
result:
wrong answer 320002nd numbers differ - expected: '0', found: '1'