This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
using namespace std;
#define all(s) s.begin(), s.end()
#define ll long long
#define fr first
#define sc second
#define pb push_back
#define mk make_pair
#define pi pair < int, int >
const int N = 3007;
const int INF = 1e9 + 7;
pi d[4] = {{1, 0}, {-1, 0}, {0, -1}, {0, 1}};
int x[N], y[N];
int us[N];
int n, ans;
int check (int v, int u, int k, int t){
if (abs(x[v] - x[u]) != abs(y[v] - y[u])){
if (x[v] == x[u]){
}
else if (y[v] == y[u]){
}
return -1;
}
if (t > abs(x[v] - x[u]))
return -1;
if (k == 0){
if (x[u] < x[v])
return -1;
if (y[u] > y[v])
return 2;
else
return 3;
}
if (k == 1){
if (x[u] > x[v])
return -1;
if (y[u] > y[v])
return 2;
else
return 3;
}
if (k == 2){
if (y[u] > y[v])
return -1;
if (x[u] > x[v])
return 1;
else
return 0;
}
if (k == 3){
if (y[u] < y[v])
return -1;
if (x[u] > x[v])
return 1;
else
return 0;
}
}
int solve (int ks){
int r = 0;
priority_queue < pair < int, pi > > qr;
qr.push({0, {ks, 1}});
while (!qr.empty()){
int t = qr.top().fr, k = qr.top().sc.fr, v = qr.top().sc.sc;
qr.pop();
if (us[v])
continue;
r++;
us[v] = 1;
for (int i = 2; i <= n; i++){
if (us[i])
continue;
int nk = check(v, i, k, t);
if (nk != -1){
qr.push({abs(x[v] - x[i]), {nk, i}});
}
}
}
return r;
}
main (){
cin >> n;
for (int i = 1; i <= n; i++){
cin >> x[i] >> y[i];
}
ans = max(ans, solve(0));
memset(us, 0, sizeof(us));
ans = max(ans, solve(1));
memset(us, 0, sizeof(us));
ans = max(ans, solve(2));
memset(us, 0, sizeof(us));
ans = max(ans, solve(3));
cout << ans;
}
Compilation message (stderr)
fever.cpp:90:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
90 | main (){
| ^~~~
fever.cpp: In function 'int check(int, int, int, int)':
fever.cpp:65:1: warning: control reaches end of non-void function [-Wreturn-type]
65 | }
| ^
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