Submission #1099959

#	Time	Username	Problem	Language	Result	Execution time	Memory
1099959		Trn115	Stove (JOI18_stove)	C++11	100 / 100	15 ms	3028 KiB

stove

#include <bits/stdc++.h>

#define int long long
#define fi first
#define se second
#define all(v) v.begin(), v.end()

using namespace std;

inline void setio(string name = "") {
    cin.tie(0)->sync_with_stdio(0);
    if (fopen((name+".INP").c_str(), "r")) {
        freopen((name+".INP").c_str(), "r", stdin);
        freopen((name+".OUT").c_str(), "w", stdout);
    }
}

int n, k;
vector<int> t;

inline void input() {
    cin >> n >> k;
    t.resize(n);
    for (int &i : t) cin >> i;
}

inline void solve() {
    vector<int> g(n-1);
    for (int i = 0; i < n-1; ++i) g[i] = t[i+1] - t[i] - 1;
    int total = t.back() - t.front() + 1;
    sort(all(g), greater<int>());
    cout << total - accumulate(g.begin(), g.begin()+(k-1), 0);
}

signed main() {
    setio();
    input();
    solve();
}

Compilation message (stderr)

stove.cpp: In function 'void setio(std::string)':
stove.cpp:13:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   13 |         freopen((name+".INP").c_str(), "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
stove.cpp:14:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   14 |         freopen((name+".OUT").c_str(), "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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