| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 5221 |
2014-02-18T05:27:37 Z |
kriii |
초록색 삼각형 (YDX13_green) |
C++ |
|
216 ms |
1148 KB |
#include <stdio.h>
#include <algorithm>
using namespace std;
struct point{long long x,y;} P[2020],Q[2020];
bool cmp1(const point& a, const point& b){return a.y == b.x ? a.x < b.x : a.y < b.y;}
bool cmp2(const point& a, const point& b){return a.x * b.y - a.y * b.x < 0;}
int main()
{
int N;
scanf ("%d",&N);
for (int i=0;i<N;i++){
scanf ("%lld %lld",&P[i].x,&P[i].y);
}
sort(P,P+N,cmp1);
double ans = 0;
for (int i=0;i<N;i++){
int c = 0;
for (int j=i+1;j<N;j++){
Q[c].x = P[j].x - P[i].x;
Q[c].y = P[j].y - P[i].y;
c++;
}
sort(Q,Q+c,cmp2);
double sx = 0, sy = 0;
for (int j=0;j<c;j++){
ans += Q[j].x * sy - Q[j].y * sx;
sx += Q[j].x;
sy += Q[j].y;
}
}
if (N >= 3){
ans /= N;
ans /= N-1;
ans /= N-2;
ans *= 3;
}
printf ("%.12lf\n",ans);
return 0;
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
1148 KB |
Output is correct |
| 2 |
Correct |
0 ms |
1148 KB |
Output is correct |
| 3 |
Correct |
0 ms |
1148 KB |
Output is correct |
| 4 |
Correct |
0 ms |
1148 KB |
Output is correct |
| 5 |
Correct |
0 ms |
1148 KB |
Output is correct |
| 6 |
Correct |
0 ms |
1148 KB |
Output is correct |
| 7 |
Correct |
0 ms |
1148 KB |
Output is correct |
| 8 |
Correct |
0 ms |
1148 KB |
Output is correct |
| 9 |
Correct |
0 ms |
1148 KB |
Output is correct |
| 10 |
Correct |
0 ms |
1148 KB |
Output is correct |
| 11 |
Correct |
36 ms |
1148 KB |
Output is correct |
| 12 |
Correct |
68 ms |
1148 KB |
Output is correct |
| 13 |
Correct |
44 ms |
1148 KB |
Output is correct |
| 14 |
Correct |
192 ms |
1148 KB |
Output is correct |
| 15 |
Correct |
16 ms |
1148 KB |
Output is correct |
| 16 |
Correct |
184 ms |
1148 KB |
Output is correct |
| 17 |
Correct |
8 ms |
1148 KB |
Output is correct |
| 18 |
Correct |
28 ms |
1148 KB |
Output is correct |
| 19 |
Correct |
44 ms |
1148 KB |
Output is correct |
| 20 |
Correct |
0 ms |
1148 KB |
Output is correct |
| 21 |
Correct |
212 ms |
1148 KB |
Output is correct |
| 22 |
Correct |
212 ms |
1148 KB |
Output is correct |
| 23 |
Correct |
212 ms |
1148 KB |
Output is correct |
| 24 |
Correct |
212 ms |
1148 KB |
Output is correct |
| 25 |
Correct |
208 ms |
1148 KB |
Output is correct |
| 26 |
Correct |
212 ms |
1148 KB |
Output is correct |
| 27 |
Correct |
212 ms |
1148 KB |
Output is correct |
| 28 |
Correct |
212 ms |
1148 KB |
Output is correct |
| 29 |
Correct |
216 ms |
1148 KB |
Output is correct |
| 30 |
Correct |
212 ms |
1148 KB |
Output is correct |
| 31 |
Incorrect |
0 ms |
1148 KB |
Output isn't correct |
