Submission #672374

#TimeUTC-0UsernameProblemLanguageResultExecution timeMemory
6723742022-12-15 18:42:56Eae02Aliens (IOI16_aliens)C++17
4 / 100
3 ms340 KiB
#include "aliens.h"
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define all(x) begin(x),end(x)
struct Line {
mutable ll k, m, p;
ll howManyPhotos;
bool operator<(const Line& o) const { return k < o.k; }
bool operator<(ll x) const { return p < x; }
};
struct LineContainer : multiset<Line, less<>> {
const ll inf = LLONG_MAX;
ll div(ll a, ll b) { // floored division
return a / b - ((a ^ b) < 0 && a % b);
}
bool isect(iterator x, iterator y) {
if (y == end()) { x->p = inf; return false; }
if (x->k == y->k) x->p = x->m > y->m ? inf : -inf;
else x->p = div(y->m - x->m, x->k - y->k);
return x->p >= y->p;
}
void add(ll k, ll m, ll howManyPhotos) {
auto z = insert({k, m, 0, howManyPhotos}), y = z++, x = y;
while (isect(y, z)) z = erase(z);
if (x != begin() && isect(--x, y)) isect(x, y = erase(y));
while ((y = x) != begin() && (--x)->p >= y->p) isect(x, erase(y));
}
 
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Compilation message (stderr)

aliens.cpp: In function 'll take_photos(int, int, int, std::vector<int>, std::vector<int>)':
aliens.cpp:54:15: warning: unused variable 'inf' [-Wunused-variable]
   54 |  constexpr ll inf = LLONG_MAX;
      |               ^~~
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