Submission #287961

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
287961	2020-09-01 07:15:16	PeppaPig	Discharging (NOI20_discharging)	C++14	100 / 100	183 ms	22496 KiB

Discharging

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#include <bits/stdc++.h>
#define long long long
using namespace std;
const int N = 1e6 + 5;
struct CHT {
    struct line {
        long m, c;
        line(long m, long c) : m(m), c(c) {}
        long f(long x) { return m * x + c; }
    };
    int ptr = 0;
    vector<line> vec;
    bool bad(line a, line b, line c) {
        return 1.0 * (c.c - a.c) / (a.m - c.m) <= 1.0 * (b.c - a.c) /  (a.m - b.m);
    }
    void add(long m, long c) {
        line l(m, c);
        while(vec.size() > 1 && bad(vec[(int)vec.size() - 2], vec.back(), l))
            vec.pop_back();
        vec.emplace_back(l);
    }
    long get_ans(long x) {
        if(ptr >= (int)vec.size()) ptr = (int)vec.size() - 1;
 
 
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Compilation message (stderr)

Discharging.cpp: In function 'int main()':
Discharging.cpp:42:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   42 |     scanf("%d", &n);
      |     ~~~~~^~~~~~~~~~
Discharging.cpp:43:33: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   43 |     for(int i = n; i; i--) scanf("%lld", A + i);
      |                            ~~~~~^~~~~~~~~~~~~~~

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