Submission #12798

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
12798	2015-01-03 14:29:03	woqja125	전선 연결하기 (GA9_wire)	C++98	0 / 100	0 ms	8120 KiB

wire

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#include<stdio.h>
int d[600001];
int l[300001];
int ans[300001];
int a[300001], at=-1;
int b[300001], bt=-1;
int main()
{
  int n, i;
  int t;
  a[++at] = b[++bt] = 10000000;
  scanf("%d", &n);
  for(i=1; i<=2*n; i++)
  {
    scanf("%d", d+i);
    l[d[i]] = i;
  }
  for(i=1; i<=2*n; i++)
  {
    t = l[d[i]];
    if(t == i) continue;
    while(a[at] <= i) at--;
    while(b[bt] <= i) bt--;
    if(t > a[at] && t > b[bt])
    {
//      while(1);
      printf("IMPOSSIBLE");
      return 0;
    }
    if(t <= a[at] && (a[at] <= b[bt] || b[bt] < t) )
 
 
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• Subtask 4: 0 / 39