Submission #671107

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
671107	2022-12-12 03:58:44	vuavisao	Discharging (NOI20_discharging)	C++14	100 / 100	100 ms	19484 KiB

Discharging

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#include<bits/stdc++.h>
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
#define ll long long
#define ld long double
using namespace std;
const ll N = 1e6 + 10;
const ll INF = 1e18;
struct line {
    ll a = 0, b = 0;
    line() {};
    line(ll _a, ll _b) { a = _a; b = _b; }
    ll Fn(const ll& x) { return this -> a * x + this -> b; }
};
bool bad(line A, line B, line C) {
    return (ld) (C.b - A.b) / (A.a - C.a) < (ld) (B.b - A.b) / (A.a - B.a);
}
struct CHT {
    vector<line> memo = {};
    ll ptr = 0; /// for a query where x has been sorted
    void add_line(const line& cur) {
        ll k = memo.size();
        while(k >= 2 && bad(memo[k - 2], memo[k - 1], cur)) {
            memo.pop_back();
 
 
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Compilation message (stderr)

Discharging.cpp: In member function 'long long int CHT::Query_ptr(const long long int&)':
Discharging.cpp:50:19: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<line>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   50 |         while(ptr < memo.size() - 1 && memo[ptr].Fn(x) > memo[ptr + 1].Fn(x)) ++ ptr;
      |               ~~~~^~~~~~~~~~~~~~~~~
Discharging.cpp: In function 'int32_t main()':
Discharging.cpp:69:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   69 |         freopen("Discharging.inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Discharging.cpp:70:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   70 |         freopen("Discharging.out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 9 / 9
• Subtask 2: 13 / 13
• Subtask 3: 25 / 25
• Subtask 4: 11 / 11
• Subtask 5: 14 / 14
• Subtask 6: 28 / 28