#include <bits/stdc++.h>
using namespace std;
#define int int64_t
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef pair<int,int> ii;
typedef vector<ii> vii;
typedef vector<vii> vvii;
typedef vector<bool> vb;
typedef vector<vb> vvb;
#define x first
#define y second
#define pb push_back
#define loop(i,s,e) for(int i=s;i<e;i++)
#define loopr(i,s,e) for(int i=e-1; i>=s;i--)
#define chkmax(a,b) a=max(a,b)
#define chkmin(a,b) a=min(a,b)
#define all(a) a.begin(),a.end()
#define fast {ios_base::sync_with_stdio(0); cin.tie(0);}
const int inf = 1e18;
const int INF = 1e9;
int n;
int mult(int x1, int y1, int x2, int y2, int x3, int y3){
x2-=x1; x3-=x1;
y2-=y1; y3-=y1;
int ans = (x2*y3 - x3*y2);
return ans;
}
int dir(int x1, int y1, int x2, int y2, int x3, int y3){
int prod = mult(x1,y1,x2,y2,x3,y3);
if(prod>0) return 1;
else if(prod<0) return -1;
return 0;
}
bool on_line(int x1, int y1, int x2, int y2, int x3, int y3){
bool ans = (min(x1,x2)<=x3 && x3<=max(x1,x2) && min(y1,y2) <= y3 && y3<=max(y1,y2));
return ans;
}
bool intersection(int x1, int y1, int x2, int y2, int x3, int y3, int x4, int y4){
int d1 = dir(x1,y1,x2,y2,x4,y4);
int d2 = dir(x1,y1,x2,y2,x3,y3);
int d3 = dir(x4,y4,x3,y3,x2,y2);
int d4 = dir(x4,y4,x3,y3,x1,y1);
if(d1*d2<0 && d3*d4<0) return 1;
if(!d1 && on_line(x1,y1,x2,y2,x4,y4)) return 1;
if(!d2 && on_line(x1,y1,x2,y2,x3,y3)) return 1;
if(!d3 && on_line(x3,y3,x4,y4,x2,y2)) return 1;
if(!d4 && on_line(x3,y3,x4,y4,x1,y1)) return 1;
}
int32_t main()
{
fast;
cin >> n;
vii p(n); loop(i,0,n) cin >> p[i].x >> p[i].y;
vi good;
loop(i,0,n){
bool ok=1;
int x1=0, y1=0, x2 = p[i].x, y2 = p[i].y;
loop(j,0,n){
int next = (j+1)%n;
int x3 = p[j].x, y3 = p[j].y;
int x4 = p[next].x, y4 = p[next].y;
if(next != i && j != i){
if(!(on_line(x3,y3,x4,y4,x2,y2)&&!dir(x3,y3,x2,y2,x4,y4)) && intersection(x1,y1,x2,y2,x3,y3,x4,y4)){
ok=0; break;
}
}
else{
if(!dir(x3,y3,x4,y4,x1,y1) && on_line(x1,y1,x2,y2,x3,y3) && on_line(x1,y1,x2,y2,x4,y4)){
ok=0; break;
}
}
}
if(ok) good.pb(i+1);
}
sort(all(good));
cout << good.size() << endl;
for(int ind:good) cout << ind << " ";
return 0;
}
Compilation message
circuit.cpp: In function 'bool intersection(int64_t, int64_t, int64_t, int64_t, int64_t, int64_t, int64_t, int64_t)':
circuit.cpp:56:1: warning: control reaches end of non-void function [-Wreturn-type]
56 | }
| ^
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
1 ms |
212 KB |
Output isn't correct |
| 2 |
Incorrect |
1 ms |
340 KB |
Output isn't correct |
| 3 |
Incorrect |
2 ms |
332 KB |
Output isn't correct |
| 4 |
Incorrect |
1 ms |
340 KB |
Output isn't correct |
| 5 |
Incorrect |
3 ms |
624 KB |
Output isn't correct |
| 6 |
Incorrect |
3 ms |
588 KB |
Output isn't correct |
| 7 |
Incorrect |
4 ms |
840 KB |
Output isn't correct |
| 8 |
Incorrect |
2 ms |
468 KB |
Output isn't correct |
| 9 |
Incorrect |
2 ms |
460 KB |
Output isn't correct |
| 10 |
Incorrect |
3 ms |
596 KB |
Output isn't correct |
| 11 |
Incorrect |
3 ms |
580 KB |
Output isn't correct |
| 12 |
Incorrect |
5 ms |
856 KB |
Output isn't correct |
| 13 |
Incorrect |
7 ms |
1108 KB |
Output isn't correct |
| 14 |
Incorrect |
8 ms |
1364 KB |
Output isn't correct |
| 15 |
Incorrect |
10 ms |
1748 KB |
Output isn't correct |
| 16 |
Incorrect |
17 ms |
3040 KB |
Output isn't correct |
| 17 |
Incorrect |
18 ms |
3160 KB |
Output isn't correct |
| 18 |
Incorrect |
38 ms |
5856 KB |
Output isn't correct |
| 19 |
Incorrect |
36 ms |
5864 KB |
Output isn't correct |
| 20 |
Incorrect |
34 ms |
6092 KB |
Output isn't correct |
