Submission #787265

#	Time	Username	Problem	Language	Result	Execution time	Memory
787265		guagua0407	Stove (JOI18_stove)	C++17	100 / 100	17 ms	2332 KiB

stove

//#pragma GCC optimize("O3")
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define pii pair<int,int>
#define f first
#define s second
#define all(x) x.begin(),x.end()
#define _ ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);

void setIO(string s) {
    freopen((s + ".in").c_str(), "r", stdin);
    freopen((s + ".out").c_str(), "w", stdout);
}

int main() {_
    int n,k;
    cin>>n>>k;
    int t[n];
    for(int i=0;i<n;i++){
        cin>>t[i];
    }
    vector<int>vec;
    for(int i=1;i<n;i++){
        vec.push_back(t[i]-t[i-1]);
    }
    sort(all(vec));
    if(k==n){
        cout<<n<<'\n';
        return 0;
    }
    int ans=0;
    for(int i=0;i<n-k;i++){
        ans+=vec[i];
    }
    ans+=k;
    cout<<ans<<'\n';
    return 0;
}
//maybe its multiset not set

Compilation message (stderr)

stove.cpp: In function 'void setIO(std::string)':
stove.cpp:12:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   12 |     freopen((s + ".in").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
stove.cpp:13:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   13 |     freopen((s + ".out").c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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