제출 #647687

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
647687		sugartheanh	K개의 묶음 (IZhO14_blocks)	C++14	0 / 100	72 ms	164684 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[K][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));
    memset(f,0x3f,sizeof(f));
    dp[0][0] = 0;
    a[0] = 1e9;
    fo(i,1,k)
    {
        stack<int>st;
        st.push(0);
        int mx = 0;
        fo(j,1,n)
        {
            mx = max(mx, a[j]);
            if(i == 1)
                dp[i][j] = f[i][j] = mx;
            while(!st.empty() && a[st.top()] <= a[j])
            {
                int last = st.top();
                st.pop();
                f[i-1][st.top()] = min(f[i-1][st.top()], f[i-1][last]);
            }
//            if(i <= j)
            {
                dp[i][j] = min({dp[i][j], dp[i][st.top()], f[i-1][st.top()] + a[j]});
                f[i][j] = dp[i][j];
            }
            st.push(j);
        }
    }
    cout<<dp[k][n];
}

컴파일 시 표준 에러 (stderr) 메시지

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