This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include<stdio.h>
#include<string.h>
#include<stdlib.h>
int max(int x,int y){
if(x>y) return x;
return y;
}
int min(int x,int y){
if(x>y) return y;
return x;
}
int n;
int s1,e1,p,t=1,a[600010],ch[600010],top,q[300010],s[300010],e[300010],dap[300010],f,r,treeb[2200010],treef[2200010],tree[2200010];
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)
{
if(s1<=x && y<=e1) return treef[k];
if(s1>y || e1<x) return 2147483647;
return min(queryf(x,(x+y)/2,k*2),queryf((x+y)/2+1,y,k*2+1));
}
int queryb(int x,int y,int k)
{
if(s1<=x && y<=e1) return treeb[k];
if(s1>y || e1<x) return 0;
return max(queryb(x,(x+y)/2,k*2),queryb((x+y)/2+1,y,k*2+1));
}
int query(int x,int y,int k)
{
if(s1<=x && y<=e1) return tree[k];
if(s1>y || e1<x) return 0;
return max(query(x,(x+y)/2,k*2),query((x+y)/2+1,y,k*2+1));
}
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)
{
s1=s[i]+1; e1=e[i]-1;
if(query(1,t,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)
{
s1=s[i]+1; e1=e[i]-1;
if(query(1,t,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)
{
dap[i]=1;
q[++r]=i;
updatef(e[i],2147483647);
updateb(s[i],0);
while(f!=r)
{
f++;
for(;;)
{
s1=s[q[f]]+1; e1=e[q[f]]-1;
p=queryf(1,t,1);
if(p>=s[q[f]] || s1>e1) break;
updatef(e[a[p]],2147483647);
updateb(s[a[p]],0);
dap[a[p]]=(dap[q[f]]+1)%2;
ch[a[p]]=1;
q[++r]=a[p];
}
for(;;)
{
s1=s[q[f]]+1; e1=e[q[f]]-1;
p=queryb(1,t,1);
if(p<=e[q[f]] || s1>e1) break;
updateb(s[a[p]],0);
updatef(e[a[p]],2147483647);
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;
}
# | Verdict | Execution time | Memory | Grader output |
---|
Fetching results... |
# | Verdict | Execution time | Memory | Grader output |
---|
Fetching results... |
# | Verdict | Execution time | Memory | Grader output |
---|
Fetching results... |
# | Verdict | Execution time | Memory | Grader output |
---|
Fetching results... |