Submission #1093889

#	Time	Username	Problem	Language	Result	Execution time	Memory
1093889		InvMOD	Stove (JOI18_stove)	C++14	100 / 100	16 ms	2384 KiB

stove

#include<bits/stdc++.h>

using namespace std;


void solve()
{
    int n,k; cin >> n >> k;

    vector<int> T(n+1, 0);
    for(int i = 1; i <= n; i++){
        cin >> T[i];
    }

    int answer = (T[n] + 1) - T[1];
    // don't count last time cause that's when JOI turn off

    vector<int> minimize;
    for(int i = 2; i <= n; i++){
        // turn off at T[i-1] + 1, turn on again at T[i]
        minimize.push_back(-((T[i]-1) - T[i-1]));
    }

    sort(minimize.begin(), minimize.end());

    for(int i = 0; i < min((int)minimize.size(), k-1); i++){
        if(!minimize[i]) break;
        answer = answer + minimize[i];
    }
    cout << answer <<"\n";
}

int32_t main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);

    #define name "InvMOD"
    if(fopen(name".INP", "r")){
        freopen(name".INP", "r", stdin);
        freopen(name".OUT", "w", stdout);
    }

    solve();
    return 0;
}

Compilation message (stderr)

stove.cpp: In function 'int32_t main()':
stove.cpp:39:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   39 |         freopen(name".INP", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
stove.cpp:40:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   40 |         freopen(name".OUT", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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