Submission #406276

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
406276	2021-05-17 10:13:21	saarang123	Discharging (NOI20_discharging)	C++17	100 / 100	246 ms	25680 KiB

Discharging

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#include <bits/stdc++.h>
using namespace std;
#define int long long
 
const int inf = 1e15;
const int N = 1502;
 
struct line {
    mutable long long m, b, l;
    line(long long _m, long long _b) : m(_m), b(_b), l(0) {}
    bool operator<(const line& other) const { return m < other.m; }
    bool operator<(const long long x) const { return l < x; }
};
template<bool GET_MAX = false>
struct CHT : multiset<line, less<>> {
    // double: inf = 1/.0, div(a, b) = a / b
    static const long long inf = 1e15;
    long long div(long long a, long long b) { return a / b - ((a ^ b) < 0 && a & b); }
    bool isect(iterator x, iterator y) {
        if (y == end()) { x->l = inf; return false; }
        if (x->m == y->m) x->l = x->b > y->b ? inf : -inf;
        else x->l = div(y->b - x->b, x->m - y->m);
        return x->l >= y->l;
    }
    void add(line l) {
        if (!GET_MAX) l.m = -l.m, l.b = -l.b; 
        auto z = insert(l), 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)->l >= y->l) isect(x, erase(y));
 
 
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• Subtask 1: 9 / 9
• Subtask 2: 13 / 13
• Subtask 3: 25 / 25
• Subtask 4: 11 / 11
• Subtask 5: 14 / 14
• Subtask 6: 28 / 28