Submission #876293

#	Time	Username	Problem	Language	Result	Execution time	Memory
876293		cpptowin	Stove (JOI18_stove)	C++14	100 / 100	15 ms	4828 KiB

stove

#include<bits/stdc++.h>
#define fo(i,d,c) for(int i=d;i<=c;i++)
#define fod(i,c,d) for(int i=c;i>=d;i--)
#define maxn 1000010
#define N 1010
#define fi first
#define se second
#define pb emplace_back
#define en cout<<"\n";
#define int long long
#define inf 1000000000
#define pii pair<int,int>
#define vii vector<pii>
#define lb(x) x&-x
#define bit(i,j) ((i>>j)&1)
#define offbit(i,j) (i^(1<<j))
#define onbit(i,j) (i|(1<<j))
#define vi vector<int>
template <typename T1, typename T2> bool minimize(T1 &a, T2 b){if (a > b) {a = b; return true;} return false;}
template <typename T1, typename T2> bool maximize(T1 &a, T2 b){if (a < b) {a = b; return true;} return false;}
using namespace std;
int n,k;
int a[maxn];
void sub1()
{
    int res = 1e9;
    fo(i,0,n - 1) cin >> a[i];
    fo(mask,0,(1 << n) - 1) if(__builtin_popcount(mask) == k - 1)
    {
        int ans = 0;
        int pre = a[0];
        fo(i,1,n - 1)
        {
            if(bit(mask,i))
            {
                ans += a[i - 1] - pre + 1;
                pre = a[i];
            }
        }
        ans += a[n - 1] - pre + 1;
        res = min(res,ans);
    }
    cout << res;
}
void full()
{
    vi v;
    fo(i,1,n)  cin >> a[i];
    int ans = a[n] - a[1] + 1;
    fo(i,2,n) v.pb(a[i] - a[i - 1]);
    sort(v.begin(),v.end(),greater<int>());
    fo(i,0,min(k - 2,n - 1)) ans -= v[i] - 1;
    cout << ans;
}
main()
{
    #define name "TASK"
    if(fopen(name".inp","r"))
    {
       freopen(name".inp","r",stdin);
       freopen(name".out","w",stdout);
    }
    ios_base::sync_with_stdio(false);cin.tie(NULL);
    cin >> n >> k;
//    if(n <= 20) sub1();
//    else
        full();
}

Compilation message (stderr)

stove.cpp:55:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   55 | main()
      | ^~~~
stove.cpp: In function 'int main()':
stove.cpp:60:15: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   60 |        freopen(name".inp","r",stdin);
      |        ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
stove.cpp:61:15: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   61 |        freopen(name".out","w",stdout);
      |        ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

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