Submission #1290568

#	Time	Username	Problem	Language	Result	Execution time	Memory
1290568		antarbanik	Stove (JOI18_stove)	C++20	100 / 100	14 ms	2252 KiB

stove

#include<bits/stdc++.h>
using namespace std;
#define int long long
#define yes cout << "YES\n";
#define nl cout << endl;
#define no cout << "NO\n";
#define all(x) x.begin(), x.end()
#define allr(x) x.rbegin(), x.rend()
#define pb push_back
#define ppb pop_back
// #define mp make_pair
#define ff first
#define ss second
#define st string
#define fr(i, x, y) for (int i = x; i < y; i++)
#define FAST ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);

// #define MAX 1e18
// #define MIN -1e18

#ifndef ONLINE_JUDGE
#define debug(x) cerr << setw(15) << left << #x << ": "; _print(x); cerr << endl;
#define del cerr << '\n';
#else
#define debug(x)
#define del
#endif

void _print(int t) {cerr << t;}
void _print(string t) {cerr << t;}
void _print(char t) {cerr << t;}

template <typename T, typename V> void _print(const pair<T, V>& p) {cerr << '{'; _print(p.first); cerr << ", "; _print(p.second); cerr << '}';}
template <typename T> void _print(const vector<T>& v) {cerr << '['; for (size_t i = 0; i < v.size(); ++i) {_print(v[i]); if (i != v.size() - 1) cerr << ", ";} cerr << ']';}
template <typename T> void _print(const set<T>& s) {cerr << '{'; bool first = true; for (const auto& x : s) {if (!first) cerr << ", "; _print(x); first = false;} cerr << '}';}
template <typename T> void _print(const multiset<T>& s) {cerr << '{'; bool first = true; for (const auto& x : s) {if (!first) cerr << ", "; _print(x); first = false;} cerr << '}';}
template <typename T, typename V> void _print(const map<T, V>& m) {cerr << '{'; bool first = true; for (const auto& kv : m) {if (!first) cerr << ", "; _print(kv); first = false;} cerr << '}';}

int power(int n, int k){int result = 1;while (k > 0) {if (k & 1) {result = (result * n);}n = (n * n);k >>= 1;}return result;}
int gcd(int a, int b) {if (b > a) {return gcd(b, a);} if (b == 0) {return a;} return gcd(b, a % b);}
int lcm(int a, int b) {return (a / __gcd(a, b)) * b;}
bool isPrime(int n) {if (n <= 1) return false;if (n == 2) return true;if (n % 2 == 0) return false;for (int i = 3; i * i <= n; i += 2) {if (n % i == 0) return false;}return true;}





/*

k ta match ache. so max k bar jalaite parmu!!!



print kora lagbo minimum operating time.



1 3 6


df = 2 3



1
2
5X
6
8X
11X
13
15X
16
20X


*/



void solve(){
    int n, k; cin>>n>>k;
    vector<int> v(n);
    for(int i = 0;i<n;++i) cin>>v[i];
    vector<int> df;
    for(int i = 0;i<n - 1; ++i) df.pb(v[i+1]-v[i]);

    // for(auto e : df) cout<<e<<" ";

    int ans = k;

    sort(allr(df));

    for(int i = k-1;i<n-1;++i){
        ans += df[i];
    }
    cout<<ans;




}   


int32_t main() {
    FAST



    #ifndef ONLINE_JUDGE
        freopen("error.txt", "w", stderr);
    #endif


    int t = 1;
    // cin >> t;
    while (t--) {
        solve();
        cout << endl;
    }
}

Compilation message (stderr)

stove.cpp: In function 'int32_t main()':
stove.cpp:111:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  111 |         freopen("error.txt", "w", stderr);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~

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