Submission #138876

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
138876	2019-07-30 16:32:20	mosesmayer	Aliens (IOI16_aliens)	C++17	60 / 100	2068 ms	10220 KiB

aliens

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#include "aliens.h"
#include <bits/stdc++.h>
#define fi first
#define se second
#define pb push_back
using namespace std;
typedef long long LL;
typedef pair<int,int> pii;
struct Line{
  LL m, c;
  Line(LL m = 0, LL c = 0): m(m), c(c){}
  LL get(LL x){return m * x + c;}
};
struct ConvexHull{
  int sz, B, fr;
  Line *hull;
  int *cnt;
  ConvexHull(int n): sz(0), B(0), fr(0){
    hull = new Line[++n];
    cnt = new int[n];
  }
  bool is_bad(int curr, int prev, int next){
    Line c = hull[curr], p = hull[prev], n = hull[next];
    return make_pair((c.c - n.c) * (c.m - p.m), cnt[next]) < make_pair((p.c - c.c) * (n.m - c.m), cnt[curr]);
  }
  void add_line(LL m, LL c, int newcnt){
    hull[sz++] = Line(m, c);
    cnt[sz - 1] = newcnt;
    while (sz - fr > 2 && is_bad(sz-2, sz-3, sz-1)){
 
 
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Compilation message (stderr)

aliens.cpp: In function 'long long int take_photos(int, int, int, std::vector<int>, std::vector<int>)':
aliens.cpp:97:34: warning: suggest parentheses around arithmetic in operand of '^' [-Wparentheses]
    ch.add_line(-2LL * L[j], dp2[i&1^1][j-1] + L[j] * L[j] - nx[j] * nx[j], cnt[j - 1]);
                                 ~^~

• Subtask 1: 4 / 4
• Subtask 2: 12 / 12
• Subtask 3: 9 / 9
• Subtask 4: 16 / 16
• Subtask 5: 19 / 19
• Subtask 6: 0 / 40