Submission #1118136
Source Code Expand
#include<stdio.h>
#include<algorithm>
#include<vector>
#include<set>
#define pii pair<int,int>
using namespace std;
int A[101000], B[101000], n, mid, cnt, ord[201000], X[201000], SCC[201000];
set<pii>Set;
bool v[201000];
void DFS(int a, int x){
int x2, pp;
if(a<=n)x2 = X[a+n], pp=a+n;
else x2 = X[a-n], pp=a-n;
v[a] = true;
Set.erase(pii(x2,pp));
while(!Set.empty()){
auto it = Set.lower_bound(pii(x-mid+1, -1));
if(it==Set.end() || it->first > x+mid-1)break;
int y = it->second;
if(y==a){
it++;
if(it==Set.end() || it->first > x+mid-1)break;
y = it->second;
}
if(y>n)DFS(y-n,X[y-n]);
else DFS(y+n,X[y+n]);
}
ord[++cnt] = a;
}
void DFS2(int a, int x){
SCC[a] = cnt;
Set.erase(pii(x,a));
int x2;
if(a<=n)x2 = X[a+n];
else x2 = X[a-n];
while(!Set.empty()){
auto it2 = Set.lower_bound(pii(x2-mid+1, -1));
if(it2==Set.end() || it2->first > x2+mid-1)break;
int y = it2->second;
if(y==a-n || y==a+n){
it2++;
if(it2==Set.end() || it2->first > x2+mid-1)break;
y = it2->second;
}
DFS2(y,X[y]);
}
}
bool Pos(){
int i;
Set.clear();
for(i=1;i<=n+n;i++){
Set.insert(pii(X[i],i));
v[i]=false;
SCC[i] = 0;
}
for(i=1;i<=n+n;i++)v[i]=false;
cnt = 0;
for(i=1;i<=n+n;i++){
if(!v[i])DFS(i, X[i]);
}
cnt = 0;
for(i=1;i<=n+n;i++){
Set.insert(pii(X[i],i));
}
for(i=n+n;i>=1;i--){
if(!SCC[ord[i]]){
cnt++;
DFS2(ord[i],X[ord[i]]);
}
}
for(i=1;i<=n;i++)if(SCC[i] == SCC[i+n])return false;
return true;
}
int main(){
int b = 0,e = 1000000000, res = 0, i;
scanf("%d",&n);
for(i=1;i<=n;i++){
scanf("%d%d",&A[i],&B[i]);
X[i]=A[i],X[n+i]=B[i];
}
while(b<=e){
mid = (b+e)>>1;
if(Pos()){
b = mid + 1;
res = mid;
}
else e = mid -1;
}
printf("%d\n",res);
}
Submission Info
Submission Time
2017-02-18 22:11:49+0900
Task
F - Flags
User
ainta
Language
C++14 (GCC 5.4.1)
Score
1200
Code Size
2187 Byte
Status
AC
Exec Time
621 ms
Memory
2432 KB
Compile Error
./Main.cpp: In function ‘int main()’:
./Main.cpp:76:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
scanf("%d",&n);
^
./Main.cpp:78:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
scanf("%d%d",&A[i],&B[i]);
^
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
1 ms
256 KB
00_example_02.txt
AC
1 ms
256 KB
00_example_03.txt
AC
1 ms
256 KB
01.txt
AC
14 ms
384 KB
02.txt
AC
6 ms
256 KB
03.txt
AC
2 ms
256 KB
04.txt
AC
3 ms
256 KB
05.txt
AC
3 ms
256 KB
06.txt
AC
575 ms
2432 KB
07.txt
AC
581 ms
2432 KB
08.txt
AC
571 ms
2432 KB
09.txt
AC
16 ms
384 KB
10.txt
AC
6 ms
256 KB
11.txt
AC
2 ms
256 KB
12.txt
AC
3 ms
256 KB
13.txt
AC
3 ms
256 KB
14.txt
AC
619 ms
2432 KB
15.txt
AC
619 ms
2432 KB
16.txt
AC
621 ms
2432 KB
17.txt
AC
14 ms
384 KB
18.txt
AC
6 ms
256 KB
19.txt
AC
555 ms
2432 KB
20.txt
AC
555 ms
2432 KB
21.txt
AC
452 ms
2432 KB
22.txt
AC
451 ms
2432 KB
23.txt
AC
334 ms
2432 KB
24.txt
AC
273 ms
2432 KB
25.txt
AC
251 ms
2432 KB
26.txt
AC
493 ms
2432 KB
27.txt
AC
1 ms
256 KB