제출 #789441

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
789441		mindiyak	Stove (JOI18_stove)	C++14	100 / 100	18 ms	3232 KiB

stove

#pragma GCC optimize("O3")
#pragma GCC target("sse4")
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef long double ld;
typedef pair<int, int> pi;
typedef pair<ll, ll> pl;
typedef pair<ld, ld> pd;
typedef vector<int> vi;
typedef vector<ld> vd;
typedef vector<ll> vl;
typedef vector<pi> vpi;
typedef vector<pl> vpl;
#define FOR(i, a, b) for (ll i = a; i < (b); i++)
#define F0R(i, a) for (ll i = 0; i < (a); i++)
#define FORd(i, a, b) for (ll i = (b)-1; i >= a; i--)
#define F0Rd(i, a) for (ll i = (a)-1; i >= 0; i--)
#define trav(a, x) for (auto &a : x)
#define uid(a, b) uniform_int_distribution<int>(a, b)(rng)
#define len(x) (int)(x).size()
#define mp make_pair
#define pb push_back
#define fst first
#define nl endl
#define sec second
#define lb lower_bound
#define ub upper_bound
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define ins insert
const int MOD = 1000000007;
const int MX = INT_MAX;
const int MN = INT_MIN;
void init()
{
#ifndef ONLINE_JUDGE
	freopen("input.in", "r", stdin);
	freopen("output.out", "w", stdout);
#endif
}
void fastIO()
{
	ios_base::sync_with_stdio(0);
	cin.tie(0);
}


void solve()
{
    ll N,K;cin>>N>>K;
    vector<ll> data(N);
    FOR(i,0,N){
        cin >> data[i];
    }
    vector<ll> arr;
    FOR(i,1,N){
        arr.pb(data[i]-data[i-1]);
    }

    ll ans = 0;
    sort(arr.begin(),arr.end());

    // FOR(i,0,arr.size()){
    //     cout << arr[i] << " ";
    // }cout << endl;

    if(N==K){
        cout << N << endl;
        return;
    }


    FOR(i,0,N-K){
        ans += arr[i];
    }
    ans += K;
    cout << ans << endl;
}




int main()
{
	fastIO();
	// init();
	int t = 1;
	// cin >> t;
	while (t--)
		solve();
	return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

stove.cpp: In function 'void init()':
stove.cpp:38:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   38 |  freopen("input.in", "r", stdin);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
stove.cpp:39:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   39 |  freopen("output.out", "w", stdout);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 20 / 20
• Subtask 2: 30 / 30
• Subtask 3: 50 / 50