Submission #1690599
Source Code Expand
#include<bits/stdc++.h>
#define N 100000
using namespace std;
struct line {
int A, B, C, n;
double p;
} L[N];
int t[N], n;
bool cmpX(line a, line b) {
double Ka = -1.0 * a.A / a.B;
double Kb = -1.0 * b.A / b.B;
return Ka < Kb;
}
bool cmp(line a, line b) {
return a.p < b.p;
}
int lb(int x) {
return x & (-x);
}
double calc(double x, int i) {
return ((double)L[i].C - (double)L[i].A * x) / L[i].B;
}
void add(int x) {
for(; x <= n; x += lb(x)) t[x]++;
}
int ask(int x) {
int ret = 0;
for(; x > 0; x -= lb(x)) ret += t[x];
return ret;
}
int ch(double mid) {
for(int i = 1; i <= n; i++) L[i].p = calc(mid, i);
sort(L + 1, L + n + 1, cmp);
for(int i = 1; i <= n; i++) t[i] = 0;
int ret = 0;
for(int i = 1; i <= n; i++) {
ret += ask(L[i].n);
add(L[i].n);
}
return ret;
}
double sol() {
double l = -1e9, r = 1e9;
for(int i = 1; i <= 80; i++) {
double mid = (l + r) / 2;
int tmp = ch(mid);
if (tmp + tmp < n * (n - 1) / 2) l = mid;
else r = mid;
}
return l;
}
int main() {
cin >> n;
for(int i = 1; i <= n; i++) scanf("%d%d%d", &L[i].A, &L[i].B, &L[i].C);
sort(L + 1, L + n + 1, cmpX);
for(int i = 1; i <= n; i++) L[i].n = i;
double X = sol();
for(int i = 1; i <= n; i++) swap(L[i].A, L[i].B);
sort(L + 1, L + n + 1, cmpX);
for(int i = 1; i <= n; i++) L[i].n = i;
double Y = sol();
printf("%.8f %.8f\n", X, Y);
}
Submission Info
Submission Time
2017-10-17 19:25:41+0900
Task
E - CARtesian Coodinate
User
lijingze8
Language
C++14 (GCC 5.4.1)
Score
0
Code Size
1556 Byte
Status
WA
Exec Time
689 ms
Memory
1408 KB
Compile Error
./Main.cpp: In function ‘int main()’:
./Main.cpp:58:75: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
for(int i = 1; i <= n; i++) scanf("%d%d%d", &L[i].A, &L[i].B, &L[i].C);
^
Judge Result
Set Name
Sample
All
Score / Max Score
0 / 0
0 / 800
Status
Set Name
Test Cases
Sample
s1.txt, s2.txt, s3.txt
All
01.txt, 02.txt, 03.txt, 04.txt, 05.txt, 06.txt, 07.txt, 08.txt, 09.txt, 10.txt, 11.txt, 12.txt, 13.txt, 14.txt, 15.txt, 16.txt, 17.txt, 18.txt, 19.txt, 20.txt, 21.txt, 22.txt, 23.txt, 24.txt, 25.txt, 26.txt, 27.txt, 28.txt, 29.txt, 30.txt, 31.txt, 32.txt, s1.txt, s2.txt, s3.txt
Case Name
Status
Exec Time
Memory
01.txt
WA
688 ms
1408 KB
02.txt
AC
688 ms
1408 KB
03.txt
WA
685 ms
1280 KB
04.txt
WA
685 ms
1408 KB
05.txt
WA
686 ms
1280 KB
06.txt
WA
686 ms
1408 KB
07.txt
WA
686 ms
1280 KB
08.txt
WA
687 ms
1408 KB
09.txt
WA
687 ms
1280 KB
10.txt
WA
687 ms
1408 KB
11.txt
WA
685 ms
1280 KB
12.txt
WA
686 ms
1280 KB
13.txt
WA
687 ms
1280 KB
14.txt
WA
688 ms
1408 KB
15.txt
WA
687 ms
1408 KB
16.txt
WA
688 ms
1280 KB
17.txt
WA
687 ms
1408 KB
18.txt
WA
687 ms
1280 KB
19.txt
AC
687 ms
1408 KB
20.txt
WA
686 ms
1280 KB
21.txt
AC
569 ms
1408 KB
22.txt
AC
569 ms
1408 KB
23.txt
WA
689 ms
1408 KB
24.txt
WA
689 ms
1280 KB
25.txt
WA
688 ms
1408 KB
26.txt
WA
687 ms
1408 KB
27.txt
AC
1 ms
256 KB
28.txt
AC
1 ms
256 KB
29.txt
AC
1 ms
256 KB
30.txt
WA
1 ms
256 KB
31.txt
AC
1 ms
256 KB
32.txt
AC
1 ms
256 KB
s1.txt
AC
1 ms
256 KB
s2.txt
AC
1 ms
256 KB
s3.txt
WA
1 ms
256 KB