Submission #647692

#	Time	Username	Problem	Language	Result	Execution time	Memory
647692		sugartheanh	K개의 묶음 (IZhO14_blocks)	C++14	0 / 100	37 ms	82496 KiB

blocks

#include <bits/stdc++.h>
#define ll long long
#define fo(i,a,b) for(int i=a;i<=b;++i)
#define fod(i,a,b) for(int i=a;i>=b;--i)
#define ii pair<ll,ll>
#define iii pair<ll,ii>
#define fi first
#define se second
#define oo 1e18
#define bit(x,i) (((x)>>(i))&1)
using namespace std;
const int MOD = 1e9 + 7;
const int N = 1e5 + 5;
const int K = 1e2 + 5;
int n,k,a[N];
ll dp[K][N],f[N],L[N];
int main()
{
    #ifndef ONLINE_JUDGE
        freopen("new.inp","r",stdin);
        freopen("new.out","w",stdout);
    #endif // ONLINE_JUDGE
    ios::sync_with_stdio(0);
    cin.tie(0);cout.tie(0);
    cin>>n>>k;
    fo(i,1,n)
        cin>>a[i];
    memset(dp,0x3f,sizeof(dp));
    dp[0][0] = 0;
    f[0] = 1e18;
    fo(i,1,k)
    {
        int mx = 0;
        fo(j,1,n)
        {
            mx = max(mx, a[j]);
            if(i == 1)
                dp[i][j] = f[j] = mx;
            L[j] = j-1;
            while(L[j] > 0 && a[L[j]] <= a[j])
            {
                f[L[L[j]]] = min(f[L[L[j]]], f[L[j]]);
                L[j] = L[L[j]];
            }
//            if(i == 3 && j == 6)
//                cout<<L[j]<<' '<<f[L[j]]<<'\n';
            if(i <= j)
                dp[i][j] = min({dp[i][j], dp[i][L[j]], f[L[j]] + a[j]});
//            cout<<i<<' '<<j<<' '<<dp[i][j]<<'\n';
        }
        fo(j,0,n)
            f[j] = dp[i][j];
    }
    cout<<dp[k][n];
}

Compilation message (stderr)

blocks.cpp: In function 'int main()':
blocks.cpp:20:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   20 |         freopen("new.inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~
blocks.cpp:21:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   21 |         freopen("new.out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 14
• Subtask 2: 0 / 18
• Subtask 3: 0 / 21
• Subtask 4: 0 / 47