Submission #1868167
Source Code Expand
#include"bits/stdc++.h"
#define PB push_back
#define PF push_front
#define LB lower_bound
#define UB upper_bound
#define fr(x) freopen(x,"r",stdin)
#define fw(x) freopen(x,"w",stdout)
#define iout(x) printf("%d\n",x)
#define lout(x) printf("%lld\n",x)
#define REP(x,l,u) for(int x = (l);x<=(u);x++)
#define RREP(x,l,u) for(int x = (l);x>=(u);x--)
#define mst(x,a) memset(x,a,sizeof(x))
#define PII pair<int,int>
#define PLL pair<ll,ll>
#define MP make_pair
#define se second
#define fi first
#define dbg(x) cout<<#x<<" = "<<(x)<<endl;
#define sz(x) ((int)x.size())
#define cl(x) x.clear()
typedef long long ll;
typedef unsigned long long ull;
typedef double db;
typedef long double ld;
using namespace std;
const int maxn = 200010;
const int mod = 1e9+7;
const int MAX = 1000000010;
const double eps = 1e-6;
const double PI = acos(-1);
template<typename T> inline void read(T &x){
x=0;T f=1;char ch;do{ch=getchar();if(ch=='-')f=-1;}while(ch<'0'||ch>'9');do x=x*10+ch-'0',ch=getchar();while(ch<='9'&&ch>='0');x*=f;
}
template<typename A,typename B> inline void read(A&x,B&y){read(x);read(y);}
template<typename A,typename B,typename C> inline void read(A&x,B&y,C&z){read(x);read(y);read(z);}
template<typename A,typename B,typename C,typename D> inline void read(A&x,B&y,C&z,D&w){read(x);read(y);read(z);read(w);}
template<typename A,typename B> inline A fexp(A x,B p){A ans=1;for(;p;p>>=1,x=1LL*x*x%mod)if(p&1)ans=1LL*ans*x%mod;return ans;}
template<typename A,typename B> inline A fexp(A x,B p,A mo){A ans=1;for(;p;p>>=1,x=1LL*x*x%mo)if(p&1)ans=1LL*ans*x%mo;return ans;}
int n,N;
PII A[maxn];
vector<int> G[maxn],G2[maxn];
int vi[maxn],S[maxn],scc[maxn],scccnt,top;
struct Node{
int l,r;
}T[maxn];
int OP(int x){
int nn=n>>1;
if(x<=nn)return x+nn;
else return x-nn;
}
void build(int i,int l,int r){
T[i].l=l;T[i].r=r;G[i+n].clear();N=max(N,i+n);
if(l==r){
G[i+n].PB(OP(A[l].se));
return;
}
int M=l+r>>1;
build(i<<1,l,M);build(i<<1|1,M+1,r);
G[i+n].PB((i<<1)+n);G[i+n].PB((i<<1|1)+n);
}
void add(int i,int l,int r,int s){
if(l<=T[i].l&&T[i].r<=r){
G[s].PB(i+n);
return;
}
int M=T[i].l+T[i].r>>1;
if(l<=M)add(i<<1,l,r,s);if(r>M)add(i<<1|1,l,r,s);
}
void dfs(int u){
if(vi[u])return;vi[u]=1;
for(auto v:G[u])dfs(v);
S[++top]=u;
}
void dfs2(int u){
if(scc[u])return;scc[u]=scccnt;
for(auto v:G2[u])dfs2(v);
}
void findscc(){
REP(i,1,N)G2[i].clear();
REP(u,1,N)for(auto v:G[u])G2[v].PB(u);
REP(i,1,N)vi[i]=scc[i]=0;
top=0;
REP(i,1,N)dfs(i);
scccnt=0;
RREP(i,N,1){
int x=S[i];
if(!scc[x]){
scccnt++;
dfs2(x);
}
}
}
bool check(int M){
REP(i,1,n)G[i].clear();
N=0;build(1,1,n);
REP(i,1,n){
int x=LB(A+1,A+n+1,MP(A[i].fi-M+1,0))-A;
if(x<i)add(1,x,i-1,A[i].se);
x=UB(A+1,A+n+1,MP(A[i].fi+M-1,n+1))-A-1;
if(x>i)add(1,i+1,x,A[i].se);
}
// cout<<N<<endl;
findscc();
// REP(i,1,N)cout<<scc[i]<<' ';cout<<endl;
int nn=n>>1;
REP(i,1,nn)if(scc[i]==scc[i+nn])return false;
return true;
}
void Work(){
int l=0,r=A[n].fi-A[1].fi;
while(l<r){
int M=(l+r>>1)+1;
if(check(M))l=M;else r=M-1;
}
iout(l);
}
void Init(){
read(n);
REP(i,1,n){
read(A[i].fi),A[i].se=i;
read(A[i+n].fi),A[i+n].se=i+n;
}
n<<=1;
sort(A+1,A+n+1);
}
int main(){
Init();
Work();
return 0;
}
Submission Info
Submission Time |
|
Task |
F - Flags |
User |
yanQval |
Language |
C++14 (GCC 5.4.1) |
Score |
1200 |
Code Size |
3394 Byte |
Status |
AC |
Exec Time |
683 ms |
Memory |
29440 KB |
Judge Result
Set Name |
Sample |
All |
Score / Max Score |
0 / 0 |
1200 / 1200 |
Status |
|
|
Set Name |
Test Cases |
Sample |
00_example_01.txt, 00_example_02.txt, 00_example_03.txt |
All |
00_example_01.txt, 00_example_02.txt, 00_example_03.txt, 01.txt, 02.txt, 03.txt, 04.txt, 05.txt, 06.txt, 07.txt, 08.txt, 09.txt, 10.txt, 11.txt, 12.txt, 13.txt, 14.txt, 15.txt, 16.txt, 17.txt, 18.txt, 19.txt, 20.txt, 21.txt, 22.txt, 23.txt, 24.txt, 25.txt, 26.txt, 27.txt |
Case Name |
Status |
Exec Time |
Memory |
00_example_01.txt |
AC |
4 ms |
12544 KB |
00_example_02.txt |
AC |
4 ms |
12544 KB |
00_example_03.txt |
AC |
5 ms |
12544 KB |
01.txt |
AC |
15 ms |
13056 KB |
02.txt |
AC |
8 ms |
12672 KB |
03.txt |
AC |
5 ms |
12544 KB |
04.txt |
AC |
6 ms |
12544 KB |
05.txt |
AC |
6 ms |
12672 KB |
06.txt |
AC |
453 ms |
26368 KB |
07.txt |
AC |
440 ms |
26240 KB |
08.txt |
AC |
447 ms |
26368 KB |
09.txt |
AC |
16 ms |
12928 KB |
10.txt |
AC |
8 ms |
12672 KB |
11.txt |
AC |
5 ms |
12544 KB |
12.txt |
AC |
6 ms |
12544 KB |
13.txt |
AC |
6 ms |
12544 KB |
14.txt |
AC |
437 ms |
24064 KB |
15.txt |
AC |
446 ms |
24192 KB |
16.txt |
AC |
444 ms |
24064 KB |
17.txt |
AC |
17 ms |
12928 KB |
18.txt |
AC |
9 ms |
12672 KB |
19.txt |
AC |
511 ms |
25856 KB |
20.txt |
AC |
495 ms |
25728 KB |
21.txt |
AC |
641 ms |
26112 KB |
22.txt |
AC |
652 ms |
26240 KB |
23.txt |
AC |
683 ms |
29440 KB |
24.txt |
AC |
575 ms |
28672 KB |
25.txt |
AC |
606 ms |
28672 KB |
26.txt |
AC |
495 ms |
27264 KB |
27.txt |
AC |
4 ms |
12544 KB |