Submission #395420

#	Time	Username	Problem	Language	Result	Execution time	Memory
395420		__algebra__	K blocks (IZhO14_blocks)	C++14	0 / 100	1 ms	208 KiB

blocks

#include<bits/stdc++.h>
using namespace std;
int dp[100001][101],arr[100001];
int main(){
    int n,k;
    scanf("%d%d",&n,&k);
    for(int i=0;i<=k;++i)for(int j=0;j<=n;++j)dp[j][i]=1e9;
    dp[0][1]=0;
    for(int i=1;i<=n;i++)scanf("%d",&arr[i]),dp[i][1]=max(dp[i-1][1],arr[i]);
    for(int j=2;j<=k;++j){
        stack<pair<int,int>>stk;
        for(int i=j;i<=n;++i){
            int dpi=dp[i-1][j-1] , ai = arr[i];
            while(!stk.empty() && stk.top().second <= ai)dpi=min(dpi,stk.top().first),stk.pop();
            if(stk.empty() || stk.top().first+stk.top().second > ai+dpi) stk.push({dpi,ai});
            dp[i][k]=stk.top().first+stk.top().second;
        }
    }
    printf("%d\n",dp[n][k]);
}

Compilation message (stderr)

blocks.cpp: In function 'int main()':
blocks.cpp:6:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    6 |     scanf("%d%d",&n,&k);
      |     ~~~~~^~~~~~~~~~~~~~
blocks.cpp:9:31: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    9 |     for(int i=1;i<=n;i++)scanf("%d",&arr[i]),dp[i][1]=max(dp[i-1][1],arr[i]);
      |                          ~~~~~^~~~~~~~~~~~~~

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