Submission #901517

#	Time	Username	Problem	Language	Result	Execution time	Memory
901517		VinhLuu	Stove (JOI18_stove)	C++17	100 / 100	16 ms	3772 KiB

stove

// happy

//#pragma GCC optimize("O3,unroll-loops")
//#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")

#include <bits/stdc++.h>
#define int long long
//#define ll long long
#define fi first
#define se second
#define pb push_back
using namespace std;

typedef pair<int,int> pii;
typedef tuple<int,int,int> tp;
const int N = 2e5 + 5;
const int oo = 1e16;
const int mod = 1e9 + 7;
const int base = 29; // >= so pt pb max

int n, a[N], b[N], sum, k;

signed main(){
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);

    #define task "v"
    if(fopen(task ".inp","r")){
        freopen(task ".inp","r",stdin);
        freopen(task ".out","w",stdout);
    }

    cin >> n >> k;
    for(int i = 1; i <= n; i ++){
        cin >> a[i];
    }
    for(int i = 1; i < n; i ++){
        b[i] = a[i + 1] - a[i] - 1;
        sum += (a[i + 1] - a[i] - 1);
    }
//    cout << sum << "\n";
    sort(b + 1, b + n, greater<int>());
    for(int i = 1; i <= min(n - 1, k - 1); i ++){
//        cout << b[i] << "\n";
        sum -= b[i];
    }

    cout << sum + n;

}

Compilation message (stderr)

stove.cpp: In function 'int main()':
stove.cpp:28:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   28 |         freopen(task ".inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
stove.cpp:29:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   29 |         freopen(task ".out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

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