QOJ.ac
QOJ
| ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
|---|---|---|---|---|---|---|---|---|---|
| #686646 | #5426. Drain the Water Tank | wangxiaorui# | WA | 0ms | 3628kb | C++14 | 1.6kb | 2024-10-29 14:56:32 | 2024-10-29 14:56:32 |
Judging History
answer
#include<bits/stdc++.h>
using namespace std;
struct node{
int x,y;
}a[2005];
int n,ans,f[2005];
int main(){
ios::sync_with_stdio(false);
cin.tie(0);cout.tie(0);
cin>>n;
for(int i=0;i<n;i++) cin>>a[i].x>>a[i].y;
for(int i=0;i<n;i++)
{
if(a[(i-1+n)%n].y>a[i].y&&a[i].y<a[(i+1)%n].y&&
(a[(i-1+n)%n].x<a[i].x&&a[i].x<a[(i+1)%n].x||
a[i].x>=a[(i-1+n)%n].x&&a[i].x>=a[(i+1)%n].x&&a[(i+1)%n].y>a[(i-1+n)%n].y||
a[i].x<=a[(i-1+n)%n].x&&a[i].x<=a[(i+1)%n].x&&a[(i+1)%n].y<a[(i-1+n)%n].y)) ans++;
}
// cerr<<ans<<endl;
for(int i=0;i<n;i++)
{
if(f[i]) continue;
int l=i;
while(a[l].y==a[i].y) l=(l-1+n)%n;
int r=i;
while(a[r].y==a[i].y) r=(r+1)%n;
// cerr<<l<<' '<<r<<' '<<ans<<endl;
if(l==(i-1+n)%n&&r==(i+1)%n) continue;
if(a[l].y>a[i].y&&a[i].y<a[r].y&&a[l].x<=a[r].x)
{
for(int j=l;j!=r;j=(j+1)%n)
{
f[j]=1;
}
ans++;
}
}
// int p=0;
// for(int i=1;i<n;i++)
// {
// if(a[i].y<a[p].y) p=i;
// }
// p=(p-1+n)%n;
// int fl=1;
// for(int i=p;i<n;i++)
// {
// if(a[i].x<a[(i-1+n)%n].x) fl=0;
// if(a[i].x>a[(i-1+n)%n].x) fl=1;
// if(fl&&a[(i-2+n)%n].y>=a[(i-1+n)%n].y&&a[(i-1+n)%n].y<a[i].y) ans++;
//// cerr<<i<<' '<<fl<<' '<<ans<<endl;
// }
// for(int i=0;i<p;i++)
// {
// if(a[i].x<a[(i-1+n)%n].x) fl=0;
// if(a[i].x>a[(i-1+n)%n].x) fl=1;
// if(fl&&a[(i-2+n)%n].y>=a[(i-1+n)%n].y&&a[(i-1+n)%n].y<a[i].y) ans++;
// }
cout<<ans;
return 0;
}
/*
15
1 4
2 1
3 0
4 2
5 1
7 8
8 0
10 5
8 10
6 8
5 10
1 10
4 8
4 4
2 7
16
1 5
2 2
3 2
3 1
5 0
7 0
7 2
9 2
9 4
8 4
8 3
5 3
5 6
4 4
3 6
3 3
*/
Details
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Test #1:
score: 100
Accepted
time: 0ms
memory: 3628kb
input:
6 0 0 1 1 2 1 3 0 3 2 0 2
output:
2
result:
ok 1 number(s): "2"
Test #2:
score: 0
Accepted
time: 0ms
memory: 3628kb
input:
8 4 4 0 4 0 2 1 2 2 2 2 0 3 0 4 0
output:
1
result:
ok 1 number(s): "1"
Test #3:
score: 0
Accepted
time: 0ms
memory: 3564kb
input:
7 1 0 3 4 0 3 1 2 2 3 1 1 0 2
output:
2
result:
ok 1 number(s): "2"
Test #4:
score: -100
Wrong Answer
time: 0ms
memory: 3616kb
input:
6 0 0 2 0 1 1 4 1 5 0 3 4
output:
1
result:
wrong answer 1st numbers differ - expected: '2', found: '1'