Submission #1248117

#	Time	Username	Problem	Language	Result	Execution time	Memory
1248117		kokokai	K blocks (IZhO14_blocks)	C++20	100 / 100	272 ms	166004 KiB

blocks

#include<bits/stdc++.h>
using namespace std;
using ll = long long;
const int N = 1e5+4;
ll a[N];
ll dp[N][105];
ll dp1[N][105];
ll n,K;
void solve(){
    memset(dp,0x3f3f3f3f,sizeof dp);
    memset(dp1,0x3f3f3f3f,sizeof dp1);
    cin>>n>>K;
    for(int i=1;i<=n;i++) cin>>a[i];
    dp[0][0]=0;
    for(int k=1;k<=K;k++){
        vector<int> st;
        dp1[k][k]=dp[k-1][k-1];
        //dp1[i][k]=luu min cac dp[p+1...i][k-1] voi a[p]>a[i]
        for(int i=k;i<=n;i++){
            while(!st.empty() && a[st.back()] <= a[i]){
                dp1[i][k]=min(dp1[i][k],dp1[st.back()][k]);
                st.pop_back();
            }
            dp[i][k]=min(dp[i][k],dp1[i][k]+a[i]);
            int i1=0;
            if(!st.empty()) i1=st.back();
            dp[i][k]=min(dp[i][k],dp[i1][k-1]+a[i]);
            dp1[i][k]=min(dp1[i][k],dp[i][k-1]);
            dp[i][k]=min(dp[i][k],dp[i1][k]);
            st.push_back(i);
        }
    }
    cout<<dp[n][K]<<'\n';
}
int main(){
    ios::sync_with_stdio(false);cin.tie(nullptr);cout.tie(nullptr);
    if(fopen("text.inp","r")){
        freopen("text.inp","r",stdin);
    }
    int tt=1;
    //cin>>tt;
    while(tt--){
        solve();
    }
}

Compilation message (stderr)

blocks.cpp: In function 'int main()':
blocks.cpp:38:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   38 |         freopen("text.inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~

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