#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef long double ld;
const int INF = (int) 1e9 + 1e6;
const ll LINF = (ll) 1e18 + 1e9;
const ll MOD = (ll) 1e9 + 7;
#define sz(x) (int) (x).size()
#define mp(x, y) make_pair(x, y)
#define pb push_back
#define all(x) (x).begin(), (x).end()
#define lb(s, t, x) (int) (lower_bound(s, t, x) - s)
#define ub(s, t, x) (int) (upper_bound(s, t, x) - s)
#define rep(i, f, t) for (auto i = f; i < t; ++(i))
#define per(i, f, t) for (auto i = (f); i >= (t); --(i))
ll power(ll x, ll y, ll mod = MOD) {
if (y == 0) {
return 1;
}
if (y & 1) {
return power(x, y - 1, mod) * x % mod;
} else {
ll tmp = power(x, y / 2, mod);
return tmp * tmp % mod;
}
}
template<typename A, typename B> bool mini(A &x, const B &y) {
if (y < x) {
x = y;
return true;
}
return false;
}
template<typename A, typename B> bool maxi(A &x, const B &y) {
if (x < y) {
x = y;
return true;
}
return false;
}
void add(ll &x, ll y) {
x += y;
if (x >= MOD) x -= MOD;
if (x < 0) x += MOD;
}
void run();
#define TASK ""
int main() {
#ifdef LOCAL
if (strlen(TASK) > 0) {
cerr << "Reminder: you are using file i/o, filename: " TASK "!" << endl << endl;
}
#endif
#ifndef LOCAL
if (strlen(TASK)) {
freopen(TASK ".in", "r", stdin);
freopen(TASK ".out", "w", stdout);
}
ios::sync_with_stdio(false);
cin.tie(0);
cout.tie(0);
#endif
cout << fixed << setprecision(12);
run();
return 0;
}
// == SOLUTION == //
#define double long double
const int N = 1 << 11;
const double EPS = 1e-10;
struct P {
ll x, y, c;
};
int n;
P p[N];
struct Ev {
int a, b;
double ang;
Ev(int a, int b) : a(a), b(b) {
if (p[a].x == p[b].x) {
ang = 1e10;
} else {
ang = (double) (p[a].y - p[b].y) / (p[a].x - p[b].x);
}
}
};
bool operator<(const Ev &u, const Ev &v) {
/*if (u.ang + EPS < b.ang) {
return 1;
}
if (u.ang - EPS > b.ang) {
return 0;
}*/
return u.ang < v.ang;
}
struct Node {
ll sum, res, left, right;
};
Node tree[2 * N + 13];
void upd(int i, ll val) {
i += N;
tree[i] = {val, max(0LL, val), max(0LL, val), max(0LL, val)};
i /= 2;
while (i > 0) {
tree[i].sum = tree[2 * i].sum + tree[2 * i + 1].sum;
tree[i].left = max(tree[2 * i].left, tree[2 * i].sum + tree[2 * i + 1].sum);
tree[i].right = max(tree[2 * i + 1].right, tree[2 * i + 1].sum + tree[2 * i].right);
tree[i].res = max(tree[2 * i].right + tree[2 * i + 1].left, max(tree[2 * i].res, tree[2 * i + 1].res));
i /= 2;
}
}
ll get() {
return tree[1].res;
}
int pos[N];
void make(const Ev &ev) {
int a = pos[ev.a];
int b = pos[ev.b];
//~ assert(a + 1 == b);
swap(pos[ev.a], pos[ev.b]);
ll va = tree[N + a].sum;
ll vb = tree[N + b].sum;
upd(a, vb);
upd(b, va);
}
void run() {
cin >> n;
rep(i, 0, n) {
cin >> p[i].x >> p[i].y >> p[i].c;
}
sort(p, p + n, [] (const auto &a, const auto &b) {
return mp(a.x, a.y) < mp(b.x, b.y);
});
vector<Ev> events;
events.reserve(n * (n - 1) / 2);
rep(i, 0, n) {
rep(j, i + 1, n) {
events.pb(Ev(i, j));
}
}
sort(all(events));
ll ans = 0;
rep(i, 0, n) {
upd(i, p[i].c);
pos[i] = i;
}
rep(i, 0, sz(events)) {
make(events[i]);
int j = i;
while (j + 1 < sz(events) && abs(events[j].ang - events[j + 1].ang) < EPS) {
j++;
make(events[j]);
}
maxi(ans, get());
i = j;
}
cout << ans << "\n";
}
Compilation message
bulldozer.cpp: In function 'int main()':
bulldozer.cpp:67:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
freopen(TASK ".in", "r", stdin);
~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
bulldozer.cpp:68:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
freopen(TASK ".out", "w", stdout);
~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
3 ms |
512 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
3 ms |
512 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
3 ms |
512 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
3 ms |
512 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
3 ms |
512 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
