Submission #1000588

#	Time	Username	Problem	Language	Result	Execution time	Memory
1000588		AdamGS	Bulldozer (JOI17_bulldozer)	C++17	0 / 100	1 ms	860 KiB

bulldozer

#include<bits/stdc++.h>
using namespace std;
typedef long double ld;
typedef long long ll;
#define rep(a, b) for(int a = 0; a < (b); ++a)
#define st first
#define nd second
#define pb push_back
#define all(a) a.begin(), a.end()
const int LIM=2e3+7;
pair<pair<ll,ll>,ll>T[LIM];
ll trmi[4*LIM], trma[4*LIM], trans[4*LIM], pos[LIM], N=1;
ll ilo(pair<ll,ll>a, pair<ll,ll>b) {
  return a.st*b.nd-a.nd*b.st;
} 
bool srt(pair<pair<ll,ll>,pair<ll,ll>>a, pair<pair<ll,ll>,pair<ll,ll>>b) {
  if(ilo(a.st, b.st)==0) return a.nd<b.nd;
  return ilo(a.st, b.st)>0;
}
void licz(int v) {
  trmi[v]=min(trmi[2*v], trmi[2*v+1]);
  trma[v]=max(trma[2*v], trma[2*v+1]);
  trans[v]=max(max(trans[2*v], trans[2*v+1]), trma[2*v+1]-trmi[2*v]);
}
void upd(int v, ll x) {
  v+=N;
  trmi[v]+=x;
  trma[v]+=x;
  v/=2;
  while(v) {
    licz(v);
    v/=2;
  }
}
int main() {
  ios_base::sync_with_stdio(0); cin.tie(0);
  int n;
  cin >> n;
  while(N<n) N*=2;
  rep(i, n) cin >> T[i].st.st >> T[i].st.nd >> T[i].nd;
  rep(i, n) swap(T[i].st.st, T[i].st.nd);
  sort(T, T+n);
  rep(i, n) swap(T[i].st.st, T[i].st.nd);
  vector<pair<pair<ll,ll>,pair<ll,ll>>>V;
  rep(i, n) rep(j, i) V.pb({{T[i].st.st-T[j].st.st, T[i].st.nd-T[j].st.nd}, {j, i}});
  sort(all(V), srt);
  rep(i, n) {
    pos[i]=i;
    trmi[N+i]=trma[N+i]=T[i].nd+trmi[N+i-1];
  }
  for(int i=N-1; i; --i) licz(i);
  ll ans=max(trans[1], trma[1]);
  rep(i, V.size()) {
    int l=i;
    while(l<V.size() && ilo(V[l].st, V[i].st)==0) {
      upd(pos[V[l].nd.st], T[V[l].nd.nd].nd-T[V[l].nd.st].nd);
      swap(pos[V[l].nd.st], pos[V[l].nd.nd]);
      ++l;
    }
    ans=max(ans, max(trans[1], trma[1]));
    i=l-1;
  }
  cout << ans << '\n';
}

Compilation message (stderr)

bulldozer.cpp: In function 'int main()':
bulldozer.cpp:5:36: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<std::pair<long long int, long long int>, std::pair<long long int, long long int> > >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    5 | #define rep(a, b) for(int a = 0; a < (b); ++a)
      |                                    ^
bulldozer.cpp:53:3: note: in expansion of macro 'rep'
   53 |   rep(i, V.size()) {
      |   ^~~
bulldozer.cpp:55:12: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<std::pair<long long int, long long int>, std::pair<long long int, long long int> > >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   55 |     while(l<V.size() && ilo(V[l].st, V[i].st)==0) {
      |           ~^~~~~~~~~

• Subtask 1: 0 / 5
• Subtask 2: 0 / 20
• Subtask 3: 0 / 35
• Subtask 4: 0 / 20
• Subtask 5: 0 / 20