Submission #63153

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
63153	2018-08-01 01:19:19	khsoo01	공룡 발자국 (KOI18_footprint)	C++11	100 / 100	1911 ms	84672 KiB

footprint

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#include<bits/stdc++.h>
#define X first
#define Y second
using namespace std;
typedef pair<int,int> pii;
const int N = 3005, inf = 1e9;
int n;
pii a[N], dt[N][N][2], piv;
vector<int> ans;
long long ccw (pii &A, pii &B, pii &C) {
  return (1ll*A.X*B.Y+1ll*B.X*C.Y+1ll*C.X*A.Y) - (1ll*A.Y*B.X+1ll*B.Y*C.X+1ll*C.Y*A.X);
}
bool cmp (pii &A, pii &B) {
  return ccw(piv, A, B) > 0;
}
bool cmp2 (int A, int B) {
  return ccw(piv, a[A], a[B]) > 0;
}
int main()
{
  scanf("%d",&n);
  for(int i=1;i<=n;i++) {
    scanf("%d%d",&a[i].X,&a[i].Y);
 
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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Compilation message (stderr)

footprint.cpp: In function 'int main()':
footprint.cpp:28:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&n);
  ~~~~~^~~~~~~~~
footprint.cpp:30:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d",&a[i].X,&a[i].Y);
   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
footprint.cpp:88:5: warning: 'A' may be used uninitialized in this function [-Wmaybe-uninitialized]
   A = dt[A][B][C].Y;
     ^

• Subtask 1: 14 / 14
• Subtask 2: 12 / 12
• Subtask 3: 29 / 29
• Subtask 4: 45 / 45