제출 #12176

#	제출 시각UTC-0	아이디	문제	언어	결과	실행 시간	메모리
12176	2014-12-21 15:18:31	imsifile	전선 연결하기 (GA9_wire)	C++98	0 / 100	0 ms	5020 KiB

wire

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#include<stdio.h>
#include<vector>
#define top(v) (v.size()?v[v.size()-1]:2*n)
using namespace std;
int n, ba[600060], ix2[300030];
bool chk[300030];
vector<int> stk[2];
int main(){
  int i;
  scanf("%d", &n);
  for(i=0; i<2*n; i++){
    scanf("%d", &ba[i]);
    ix2[ba[i]]=i;
  }
  for(i=0; i<2*n; i++){
    if(ix2[ba[i]]==i)stk[chk[ba[i]]].pop_back();
    else{
      if(ix2[ba[i]]<top(stk[0]))chk[ba[i]]=0, stk[0].push_back(ix2[ba[i]]);
      else if(ix2[ba[i]]<top(stk[1]))chk[ba[i]]=1, stk[1].push_back(ix2[ba[i]]);
      else{
        puts("IMPOSSIBLE");
        return 0;
      }
    }
  }
  for(i=0; i<2*n; i++)printf("%c", chk[ba[i]]?'v':'^');
  return 0;
}
 
 
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