Submission #12755

#TimeUsernameProblemLanguageResultExecution timeMemory
12755tncks0121전선 연결하기 (GA9_wire)C++14
61 / 100
624 ms55776 KiB
#include<stdio.h> #include<algorithm> #include<string.h> using namespace std; int n; int p,t=1,a[1200010],ch[1200010],top,q[2000010],s[1200010],e[1200010],dap[1200010],f,r,treeb[2000010],treef[2000010],tree[2000010]; void update(int x,int gap) { int s=x+t-1; tree[s]=gap; s/=2; while(s>0){ tree[s]=max(tree[s*2],tree[s*2+1]); s/=2; } } void updatef(int x,int gap) { int s=x+t-1; treef[s]=gap; s/=2; while(s>0){ treef[s]=min(treef[s*2],treef[s*2+1]); s/=2; } } void updateb(int x,int gap) { int s=x+t-1; treeb[s]=gap; s/=2; while(s>0){ treeb[s]=max(treeb[s*2],treeb[s*2+1]); s/=2; } } int queryf(int x,int y,int k,int s,int e) { if(s>e) return 2147483647; if(s<=x && y<=e) return treef[k]; if(s>y || e<x) return 2147483647; return min(queryf(x,(x+y)/2,k*2,s,e),queryf((x+y)/2+1,y,k*2+1,s,e)); } int queryb(int x,int y,int k,int s,int e) { if(s>e) return 0; if(s<=x && y<=e) return treeb[k]; if(s>y || e<x) return 0; return max(queryb(x,(x+y)/2,k*2,s,e),queryb((x+y)/2+1,y,k*2+1,s,e)); } int query(int x,int y,int k,int s,int e) { if(s>e) return 0; if(s<=x && y<=e) return tree[k]; if(s>y || e<x) return 0; return max(query(x,(x+y)/2,k*2,s,e),query((x+y)/2+1,y,k*2+1,s,e)); } void check() { int i; //1 for(i=1;i<=n;i++){ if(dap[i]==1) update(s[i],e[i]); } for(i=1;i<=n;i++){ if(dap[i]==1 && query(1,t,1,s[i]+1,e[i]-1)>e[i]){printf("IMPOSSIBLE"); exit(0);} } memset(tree,0,sizeof tree); //0 for(i=1;i<=n;i++){ if(dap[i]==0) update(s[i],e[i]); } for(i=1;i<=n;i++){ if(dap[i]==0 && query(1,t,1,s[i]+1,e[i]-1)>e[i]){printf("IMPOSSIBLE"); exit(0);} } } int main() { int i; scanf("%d",&n); for(i=1;i<=n*2;i++) { scanf("%d",&a[i]); if(s[a[i]]==0) s[a[i]]=i; else e[a[i]]=i; } for(i=1;;i++){if(t>=n*2) break; t*=2;} for(i=1;i<=t*2;i++) treef[i]=2147483647; for(i=1;i<=n;i++) { updatef(e[i],s[i]); updateb(s[i],e[i]); } for(i=1;i<=n;i++) { if(ch[i]==0) { ch[i]=1; dap[i]=1; q[++r]=i; updatef(e[i],2147483647); updateb(s[i],0); while(f!=r) { f++; while(queryf(1,t,1,s[q[f]]+1,e[q[f]]-1)<s[q[f]]) { p=queryf(1,t,1,s[q[f]]+1,e[q[f]]-1); updatef(e[a[p]],2147483647); dap[a[p]]=(dap[q[f]]+1)%2; ch[a[p]]=1; q[++r]=a[p]; } while(queryb(1,t,1,s[q[f]]+1,e[q[f]]-1)>e[q[f]]) { p=queryb(1,t,1,s[q[f]]+1,e[q[f]]-1); updateb(s[a[p]],0); dap[a[p]]=(dap[q[f]]+1)%2; ch[a[p]]=1; q[++r]=a[p]; } } } } check(); for(i=1;i<=n*2;i++) { if(dap[a[i]]==0) printf("v"); else printf("^"); } return 0; }
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