Submission #992554

#	Time	Username	Problem	Language	Result	Execution time	Memory
992554		voi	Stove (JOI18_stove)	C++17	100 / 100	18 ms	2004 KiB

stove

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

const int ar = 2e5+2;
const ll mod = 1e9+7;
const int oo = 1e9;

int n, k, a[2];

signed main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0), cout.tie(0);
    #define task "stove"
    if(fopen(task".inp", "r")) {
        freopen(task".inp", "r", stdin);
        freopen(task".out", "w", stdout);
    }
    cin >> n >> k;
    int bit = 0;
    vector <int> v;
    for(int i = 1; i <= n; ++i) {
        cin >> a[bit];
        if(i > 1)
        v.push_back(a[bit] - a[bit ^ 1] - 1);
        bit ^= 1;
    }
    sort(v.begin(), v.end());
    int res = n;
    for(int i = 0; i < n - k; ++i)
        res += v[i];
    cout << res;
}

Compilation message (stderr)

stove.cpp: In function 'int main()':
stove.cpp:18:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   18 |         freopen(task".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
stove.cpp:19:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   19 |         freopen(task".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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