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ID | 题目 | 提交者 | 结果 | 用时 | 内存 | 语言 | 文件大小 | 提交时间 | 测评时间 |
---|---|---|---|---|---|---|---|---|---|
#708449 | #5426. Drain the Water Tank | Rightt | WA | 0ms | 3828kb | C++14 | 1.6kb | 2024-11-03 22:24:43 | 2024-11-03 22:24:45 |
Judging History
answer
#include <bits/stdc++.h>
#define IOS ios::sync_with_stdio(false);cin.tie(0);cout.tie(0);
#define int long long
using namespace std;
using ll = long long;
using ld = long double;
struct poi{
ll x,y;
poi(){
x=0,y=0;
}
poi(ll xx,ll yy){
x=xx,y=yy;
}
};
poi operator-(poi a,poi b){return poi(a.x-b.x,a.y-b.y);};
ll cro(poi a,poi b){return a.x*b.y-b.x*a.y;}
//ToLeft测试,判断p是否在ab左边(逆时针),1左,-1右,0在线上
int toleft(poi a,poi b,poi p){
ll ans=cro((b-a) , (p-b));
if(ans==0)return 0;
if(ans>0)return 1;
return -1;
}
long long get(ll x1, ll y1, ll x2, ll y2){
return x1 * y2 - x2 * y1;
}
void solve(){
int n;
cin>>n;
ll ans=0;
vector<poi> p(5*n+5);
for(int i=0;i<n;i++){
cin>>p[i].x>>p[i].y;
p[i+3*n]=p[i+4*n]=p[i+2*n]=p[i+n]=p[i];
}
//p.push_back(p[0])
for(int i=n*2;i<n*3;i++){
int j=i,k=i;
while(p[k-1].y==p[k].y)k--;
while(p[j+1].y==p[j].y)j++;
if(j==k&&toleft(p[k-1],p[j+1],p[i])!=1&&p[j+1].y>p[i].y&&p[k-1].y>p[i].y){
ans++;
}
if (j != k && p[j+1].y>p[i].y&&p[k-1].y>p[i].y){
// cout << '\ncout << p[i].x << ' ' << p[i].y << '\n';
// cout << p[k].x << ' ' << p[k].y << '\n';
// cout << p[j].x << ' ' << p[j].y << '\n';
// ';
if (i == j - 1 && p[j+1].x>p[i].x)
ans ++ ;
}
}
cout<<ans;
}
signed main(){
IOS;
int t = 1;
// cin >> t;
while (t -- ){
solve();
}
return 0;
}
详细
Test #1:
score: 100
Accepted
time: 0ms
memory: 3552kb
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: 3828kb
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: 3484kb
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: 0
Accepted
time: 0ms
memory: 3768kb
input:
6 0 0 2 0 1 1 4 1 5 0 3 4
output:
2
result:
ok 1 number(s): "2"
Test #5:
score: 0
Accepted
time: 0ms
memory: 3544kb
input:
8 0 0 1 0 3 -1 3 0 1 1 4 1 5 0 3 4
output:
2
result:
ok 1 number(s): "2"
Test #6:
score: 0
Accepted
time: 0ms
memory: 3544kb
input:
5 0 0 170 0 140 30 60 30 0 70
output:
1
result:
ok 1 number(s): "1"
Test #7:
score: 0
Accepted
time: 0ms
memory: 3572kb
input:
5 0 0 170 0 140 30 60 30 0 100
output:
1
result:
ok 1 number(s): "1"
Test #8:
score: 0
Accepted
time: 0ms
memory: 3800kb
input:
5 0 0 1 2 1 5 0 2 0 1
output:
1
result:
ok 1 number(s): "1"
Test #9:
score: -100
Wrong Answer
time: 0ms
memory: 3544kb
input:
3 0 0 100 0 0 100
output:
0
result:
wrong answer 1st numbers differ - expected: '1', found: '0'