#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef long double ld;
typedef double db;
typedef string str;
typedef pair<int,int> pi;
typedef pair<ll,ll> pl;
typedef pair<db,db> pd;
typedef vector<int> vi;
typedef vector<bool> vb;
typedef vector<ll> vl;
typedef vector<db> vd;
typedef vector<str> vs;
typedef vector<pi> vpi;
typedef vector<pl> vpl;
typedef vector<pd> vpd;
#define mp make_pair
#define f first
#define s second
#define sz(x) (int)(x).size()
#define all(x) begin(x), end(x)
#define rall(x) (x).rbegin(), (x).rend()
#define sor(x) sort(all(x))
#define rsz resize
#define ins insert
#define ft front()
#define bk back()
#define pf push_front
#define pb push_back
#define eb emplace_back
#define lb lower_bound
#define ub upper_bound
#define FOR(i,a,b) for (int i = (a); i < (b); ++i)
#define F0R(i,a) FOR(i,0,a)
#define ROF(i,a,b) for (int i = (b)-1; i >= (a); --i)
#define R0F(i,a) ROF(i,0,a)
#define trav(a,x) for (auto& a: x)
const int MOD = 1e9+7; // 998244353;
const int MX = 2e5+5;
const ll INF = 1e18;
const ld PI = acos((ld)-1);
const int xd[4] = {1,0,-1,0}, yd[4] = {0,1,0,-1};
mt19937 rng((uint32_t)chrono::steady_clock::now().time_since_epoch().count());
template<class T> bool ckmin(T& a, const T& b) {
return b < a ? a = b, 1 : 0; }
template<class T> bool ckmax(T& a, const T& b) {
return a < b ? a = b, 1 : 0; }
constexpr int pct(int x) { return __builtin_popcount(x); }
constexpr int bits(int x) { return 31-__builtin_clz(x); } // floor(log2(x))
ll cdiv(ll a, ll b) { return a/b+((a^b)>0&&a%b); } // divide a by b rounded up
ll fdiv(ll a, ll b) { return a/b-((a^b)<0&&a%b); } // divide a by b rounded down
ll half(ll x) { return fdiv(x,2); }
template<class T, class U> T fstTrue(T lo, T hi, U f) {
// note: if (lo+hi)/2 is used instead of half(lo+hi) then this will loop infinitely when lo=hi
hi ++; assert(lo <= hi); // assuming f is increasing
while (lo < hi) { // find first index such that f is true
T mid = half(lo+hi);
f(mid) ? hi = mid : lo = mid+1;
}
return lo;
}
template<class T, class U> T lstTrue(T lo, T hi, U f) {
lo --; assert(lo <= hi); // assuming f is decreasing
while (lo < hi) { // find first index such that f is true
T mid = half(lo+hi+1);
f(mid) ? lo = mid : hi = mid-1;
}
return lo;
}
template<class T> void remDup(vector<T>& v) {
sort(all(v)); v.erase(unique(all(v)),end(v)); }
// INPUT
template<class A> void re(complex<A>& c);
template<class A, class B> void re(pair<A,B>& p);
template<class A> void re(vector<A>& v);
template<class A, size_t SZ> void re(array<A,SZ>& a);
template<class T> void re(T& x) { cin >> x; }
void re(db& d) { str t; re(t); d = stod(t); }
void re(ld& d) { str t; re(t); d = stold(t); }
template<class H, class... T> void re(H& h, T&... t) { re(h); re(t...); }
template<class A> void re(complex<A>& c) { A a,b; re(a,b); c = {a,b}; }
template<class A, class B> void re(pair<A,B>& p) { re(p.f,p.s); }
template<class A> void re(vector<A>& x) { trav(a,x) re(a); }
template<class A, size_t SZ> void re(array<A,SZ>& x) { trav(a,x) re(a); }
// TO_STRING
#define ts to_string
str ts(char c) { return str(1,c); }
str ts(const char* s) { return (str)s; }
str ts(str s) { return s; }
str ts(bool b) {
#ifdef LOCAL
return b ? "true" : "false";
#else
return ts((int)b);
#endif
}
template<class A> str ts(complex<A> c) {
stringstream ss; ss << c; return ss.str(); }
str ts(vector<bool> v) {
str res = "{"; F0R(i,sz(v)) res += char('0'+v[i]);
res += "}"; return res; }
template<size_t SZ> str ts(bitset<SZ> b) {
str res = ""; F0R(i,SZ) res += char('0'+b[i]);
return res; }
template<class A, class B> str ts(pair<A,B> p);
template<class T> str ts(T v) { // containers with begin(), end()
#ifdef LOCAL
bool fst = 1; str res = "{";
for (const auto& x: v) {
if (!fst) res += ", ";
fst = 0; res += ts(x);
}
res += "}"; return res;
#else
bool fst = 1; str res = "";
for (const auto& x: v) {
if (!fst) res += " ";
fst = 0; res += ts(x);
}
return res;
#endif
}
template<class A, class B> str ts(pair<A,B> p) {
#ifdef LOCAL
return "("+ts(p.f)+", "+ts(p.s)+")";
#else
return ts(p.f)+" "+ts(p.s);
#endif
}
// OUTPUT
template<class A> void pr(A x) { cout << ts(x); }
template<class H, class... T> void pr(const H& h, const T&... t) {
pr(h); pr(t...); }
void ps() { pr("\n"); } // print w/ spaces
template<class H, class... T> void ps(const H& h, const T&... t) {
pr(h); if (sizeof...(t)) pr(" "); ps(t...); }
// DEBUG
void DBG() { cerr << "]" << endl; }
template<class H, class... T> void DBG(H h, T... t) {
cerr << ts(h); if (sizeof...(t)) cerr << ", ";
DBG(t...); }
#ifdef LOCAL // compile with -DLOCAL, chk -> fake assert
#define dbg(...) cerr << "Line(" << __LINE__ << ") -> [" << #__VA_ARGS__ << "]: [", DBG(__VA_ARGS__)
#define chk(...) if (!(__VA_ARGS__)) cerr << "Line(" << __LINE__ << ") -> function(" \
<< __FUNCTION__ << ") -> CHK FAILED: (" << #__VA_ARGS__ << ")" << "\n", exit(0);
#else
#define dbg(...) 0
#define chk(...) 0
#endif
// FILE I/O
void setIn(str s) { freopen(s.c_str(),"r",stdin); }
void setOut(str s) { freopen(s.c_str(),"w",stdout); }
void unsyncIO() { cin.tie(0)->sync_with_stdio(0); }
void setIO(str s = "") {
unsyncIO();
// cin.exceptions(cin.failbit);
// throws exception when do smth illegal
// ex. try to read letter into int
if (sz(s)) { setIn(s+".in"), setOut(s+".out"); } // for USACO
}
ll gcd(ll a, ll b){
a = abs(a); b = abs(b);
if(a == 0) return b;
if(b == 0) return a;
return gcd(b%a, a);
}
const int mx = 2005;
int N;
int X[mx];
int Y[mx];
ll W[mx];
ll ans;
struct Node {
ll maxsub, pref, suf, tot;
Node(){
maxsub = pref = suf = tot = 0;
}
Node(int val){
maxsub = pref = suf = max(val, 0);
tot = val;
}
};
struct Point {
ll x, y;
Point(ll X, ll Y){
assert(Y > 0 || (Y==0 && X > 0));
ll g = gcd(X, Y);
x = X/g;
y = Y/g;
}
bool operator<(const Point& r) const {
return x*r.y - y*r.x > 0;
}
bool operator==(const Point& r){
return mp(x, y) == mp(r.x, r.y);
}
bool operator!=(const Point &r){
return mp(x, y) != mp(r.x, r.y);
}
};
const Node ID = Node();
Node comb(Node a, Node b) {
Node c = Node();
c.maxsub = max(max(a.maxsub, b.maxsub), a.suf+b.pref);
c.pref = max(a.pref, a.tot+b.pref);
c.suf = max(b.suf, a.suf+b.tot);
c.tot = a.tot+b.tot;
return c;
}
/**
* Description: 1D point update, range query where \texttt{comb} is
* any associative operation. If $N=2^p$ then \texttt{seg[1]==query(0,N-1)}.
* Time: O(\log N)
* Source:
* http://codeforces.com/blog/entry/18051
* KACTL
* Verification: SPOJ Fenwick
*/
template<class T> struct Seg { // comb(ID,b) = b
int n; vector<T> seg;
void init(int _n) { n = _n; seg.assign(2*n,ID); }
void pull(int p) { seg[p] = comb(seg[2*p],seg[2*p+1]); }
void upd(int p, int val) { // set val at position p
seg[p += n] = Node(val); for (p /= 2; p; p /= 2) pull(p); }
ll query() { // sum on interval [l, r]
return seg[1].maxsub;
}
};
Seg<Node> seg;
int pos[mx]; //position of the ith point
int main() {
setIO();
cin >> N;
for(int i = 1; i <= N; i++){
cin >> X[i] >> Y[i] >> W[i];
}
seg.init(2048);
vector<pair<pi, int>> pints;
for(int i = 1; i <= N; i++){
pints.pb(mp(mp(Y[i], X[i]), i));
}
sort(all(pints));
for(int i = 0; i < N; i++){
pos[pints[i].s] = i+1;
}
for(int i = 1; i <= N; i++){
seg.upd(pos[i], W[i]);
}
vector<pair<Point, pi>> upds;
for(int i = 1; i <= N; i++){
for(int j = i+1; j <= N; j++){
int ind1 = i;
int ind2 = j;
if(Y[ind2]-Y[ind1] < 0 || (Y[ind2] == Y[ind1] && X[ind1] > X[ind2])){
swap(ind1, ind2);
}
upds.pb(mp(Point(X[ind2]-X[ind1], Y[ind2]-Y[ind1]), mp(ind1, ind2)));
}
}
sort(all(upds));
for(int i = 0; i < sz(upds); i++){
int a = upds[i].s.f;
int b = upds[i].s.s;
if(pos[a] < pos[b]){
int apos = pos[a];
int bpos = pos[b];
seg.upd(bpos, W[a]);
seg.upd(apos, W[b]);
swap(pos[a], pos[b]);
}
if(i+1 == sz(upds) || upds[i].f != upds[i+1].f){
ckmax(ans, seg.query());
}
}
ps(ans);
// you should actually read the stuff at the bottom
}
/* stuff you should look for
* int overflow, array bounds
* special cases (n=1?)
* do smth instead of nothing and stay organized
* WRITE STUFF DOWN
*/
Compilation message
bulldozer.cpp: In function 'void setIn(str)':
bulldozer.cpp:168:28: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
168 | void setIn(str s) { freopen(s.c_str(),"r",stdin); }
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~
bulldozer.cpp: In function 'void setOut(str)':
bulldozer.cpp:169:29: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
169 | void setOut(str s) { freopen(s.c_str(),"w",stdout); }
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
2 ms |
748 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
3 ms |
748 KB |
Output is correct |
| 2 |
Correct |
3 ms |
748 KB |
Output is correct |
| 3 |
Correct |
3 ms |
748 KB |
Output is correct |
| 4 |
Correct |
3 ms |
748 KB |
Output is correct |
| 5 |
Correct |
3 ms |
768 KB |
Output is correct |
| 6 |
Correct |
3 ms |
748 KB |
Output is correct |
| 7 |
Correct |
3 ms |
748 KB |
Output is correct |
| 8 |
Correct |
3 ms |
748 KB |
Output is correct |
| 9 |
Correct |
2 ms |
748 KB |
Output is correct |
| 10 |
Correct |
2 ms |
748 KB |
Output is correct |
| 11 |
Correct |
1 ms |
492 KB |
Output is correct |
| 12 |
Incorrect |
1 ms |
492 KB |
Output isn't correct |
| 13 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
3 ms |
748 KB |
Output is correct |
| 2 |
Correct |
3 ms |
748 KB |
Output is correct |
| 3 |
Correct |
3 ms |
748 KB |
Output is correct |
| 4 |
Correct |
3 ms |
748 KB |
Output is correct |
| 5 |
Correct |
3 ms |
768 KB |
Output is correct |
| 6 |
Correct |
3 ms |
748 KB |
Output is correct |
| 7 |
Correct |
3 ms |
748 KB |
Output is correct |
| 8 |
Correct |
3 ms |
748 KB |
Output is correct |
| 9 |
Correct |
2 ms |
748 KB |
Output is correct |
| 10 |
Correct |
2 ms |
748 KB |
Output is correct |
| 11 |
Correct |
1 ms |
492 KB |
Output is correct |
| 12 |
Incorrect |
1 ms |
492 KB |
Output isn't correct |
| 13 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
3 ms |
748 KB |
Output is correct |
| 2 |
Correct |
3 ms |
748 KB |
Output is correct |
| 3 |
Correct |
3 ms |
748 KB |
Output is correct |
| 4 |
Correct |
3 ms |
748 KB |
Output is correct |
| 5 |
Correct |
3 ms |
768 KB |
Output is correct |
| 6 |
Correct |
3 ms |
748 KB |
Output is correct |
| 7 |
Correct |
3 ms |
748 KB |
Output is correct |
| 8 |
Correct |
3 ms |
748 KB |
Output is correct |
| 9 |
Correct |
2 ms |
748 KB |
Output is correct |
| 10 |
Correct |
2 ms |
748 KB |
Output is correct |
| 11 |
Correct |
1 ms |
492 KB |
Output is correct |
| 12 |
Incorrect |
1 ms |
492 KB |
Output isn't correct |
| 13 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
2 ms |
748 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
