#include <bits/stdc++.h>
using namespace std;
int in() {
char c=0;
while(c<'0'||c>'9')
c=getchar_unlocked();
int r=0;
while(c>='0'&&c<='9') {
r=r*10+c-'0';
c=getchar_unlocked();
}
return r;
}
void out(int x) {
int c=0, r=0;
for(; x%10==0; ++c, x/=10);
for(; x; x/=10)
r=r*10+x%10;
for(; r; r/=10)
putchar_unlocked(r%10+'0');
while(c--)
putchar_unlocked('0');
}
const int mxN=2e5;
int n, b[mxN], c[mxN+1], e1[mxN], e2[mxN], a1, t[2][mxN], tp[mxN];
long long x[mxN+1], y[mxN+1], dx[mxN], dy[mxN];
vector<array<int, 2>> r[18];
bool ans[mxN];
bool cw(int s, int p) {
return (y[p]-y[e1[s]])*dx[s]<dy[s]*(x[p]-x[e1[s]]);
}
bool pcmp(const int &i, const int &j) {
return y[i]*x[j]<y[j]*x[i];
}
bool scmp(const int &i, const int &j) {
if(i<0)
return 0;
if(j<0)
return 1;
if(e1[i]==e1[j])
return c[e2[i]]<c[e2[j]]?!cw(j, e2[i]):cw(i, e2[j]);
return c[e1[i]]<c[e1[j]]?cw(i, e1[j]):!cw(j, e1[i]);
}
int main() {
n=in();
for(int i=0; i<n; ++i)
x[i]=in(), y[i]=in();
x[n]=x[0];
y[n]=y[0];
iota(b, b+n, 0);
//sort(b, b+n, pcmp);
memset(tp, -1, 4*n);
for(int i=0, j=0; i<n; i=j) {
for(; j<n&&y[b[i]]*x[b[j]]==y[b[j]]*x[b[i]]; ++j) {
c[b[j]]=i;
if(tp[i]<0||x[b[j]]+y[b[j]]<x[tp[i]]+y[tp[i]])
tp[i]=b[j];
}
}
c[n]=c[0];
for(int i=0; i<n; ++i) {
e1[i]=i;
e2[i]=i+1;
if(c[e2[i]]<c[e1[i]])
swap(e1[i], e2[i]);
if(c[e1[i]]<c[e2[i]]) {
int k=31-__builtin_clz(c[e2[i]]-c[e1[i]]);
r[k].push_back({c[e1[i]], i});
r[k].push_back({c[e2[i]]-(1<<k), i});
dx[i]=x[e2[i]]-x[e1[i]];
dy[i]=y[e2[i]]-y[e1[i]];
}
}
memset(t[1], -1, 4*n);
/*
for(int i=17; ~i; --i) {
for(array<int, 2> a : r[i])
t[i&1][a[0]]=min(a[1], t[i&1][a[0]], scmp);
if(i) {
memset(t[i&1^1], -1, 4*n);
for(int j=0; j<=n-(1<<i); ++j) {
t[i&1^1][j]=min(t[i&1][j], t[i&1^1][j], scmp);
t[i&1^1][j+(1<<i-1)]=min(t[i&1][j], t[i&1^1][j+(1<<i-1)], scmp);
}
}
}
*/
for(int i=0; i<n; ++i)
if(~tp[i]&&(t[0][i]<0||!cw(t[0][i], tp[i])))
ans[tp[i]]=1;
for(int i=0; i<n; ++i)
a1+=ans[i];
out(a1);
putchar_unlocked('\n');
for(int i=0; i<n; ++i) {
if(ans[i]) {
out(i+1);
putchar_unlocked(' ');
}
}
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
2 ms |
384 KB |
Output isn't correct |
| 2 |
Incorrect |
2 ms |
512 KB |
Output isn't correct |
| 3 |
Incorrect |
2 ms |
640 KB |
Output isn't correct |
| 4 |
Incorrect |
3 ms |
768 KB |
Output isn't correct |
| 5 |
Incorrect |
4 ms |
1280 KB |
Output isn't correct |
| 6 |
Incorrect |
3 ms |
1280 KB |
Output isn't correct |
| 7 |
Incorrect |
4 ms |
2044 KB |
Output isn't correct |
| 8 |
Incorrect |
3 ms |
1152 KB |
Output isn't correct |
| 9 |
Incorrect |
3 ms |
1280 KB |
Output isn't correct |
| 10 |
Incorrect |
3 ms |
1280 KB |
Output isn't correct |
| 11 |
Incorrect |
11 ms |
1404 KB |
Output isn't correct |
| 12 |
Incorrect |
4 ms |
2016 KB |
Output isn't correct |
| 13 |
Incorrect |
5 ms |
2552 KB |
Output isn't correct |
| 14 |
Incorrect |
8 ms |
3572 KB |
Output isn't correct |
| 15 |
Incorrect |
8 ms |
4084 KB |
Output isn't correct |
| 16 |
Incorrect |
14 ms |
7536 KB |
Output isn't correct |
| 17 |
Incorrect |
15 ms |
7536 KB |
Output isn't correct |
| 18 |
Incorrect |
26 ms |
14572 KB |
Output isn't correct |
| 19 |
Incorrect |
25 ms |
14572 KB |
Output isn't correct |
| 20 |
Incorrect |
34 ms |
16100 KB |
Output isn't correct |
