Submission #1143387

#	Time	Username	Problem	Language	Result	Execution time	Memory
1143387		duyngadocton	Stove (JOI18_stove)	C++17	100 / 100	20 ms	1480 KiB

stove

#include<bits/stdc++.h>

using namespace std;

#define task "stove"
#define pb push_back
#define ll long long

const int MAX = (int) 1e5;

int n, k;
int t[MAX + 5];

int main() {
    if(fopen(task".inp","r")) {
        freopen(task".inp","r",stdin);
        freopen(task".out","w",stdout);
    }
    ios::sync_with_stdio(0);
    cin.tie(NULL);cout.tie(NULL);
    cin >> n >> k;
    for(int i = 1; i <= n; ++i)
        cin >> t[i];
    vector<int> lst;
    for(int i = 2; i <= n; ++i) {
        lst.pb(t[i] - t[i - 1]);
    }
    sort(lst.begin(), lst.end());
    reverse(lst.begin(), lst.end());
    ll ds = 0;
    for(int i = 1; i < k; ++i) ds += lst[i - 1];
    cout << t[n] - ds - t[1] + k;
}

Compilation message (stderr)

stove.cpp: In function 'int main()':
stove.cpp:16:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   16 |         freopen(task".inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
stove.cpp:17:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   17 |         freopen(task".out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

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