Submission #90667

#	Time	Username	Problem	Language	Result	Execution time	Memory
90667		P1QG	K blocks (IZhO14_blocks)	C++11	0 / 100	9 ms	4728 KiB

blocks

#include<bits/stdc++.h>
#define maxn 100005
using namespace std;

int n, k, a[maxn], F[maxn][105];

int main()
{
    //freopen("BLOCKS.inp","r",stdin);
    //freopen("BLOCKS.out","w",stdout);

    scanf("%d%d", &n, &k);
    for(int i=1;i<=n;i++)
    {
        scanf("%d", &a[i]);
    }


    for(int i=0;i<=n;i++)
    {
        for(int j=0;j<=k;j++) F[i][j] = 1e9+9;
    }

    F[0][1] = 0;
    for(int i=1;i<=n;i++) F[i][1] = max(F[i-1][1], a[i]);

    for(int i=2;i<=k;i++)
    {
        stack< pair<int,int> > P;
        for(int j=i;j<=n;j++)
        {
            int cur = F[j-1][i-1];

            while(P.size() && a[P.top().second] <= a[j])
            {
                cur = min(cur, P.top().first);
                P.pop();
            }

            F[j][i] = min(cur + a[j], (P.size() == 0)?F[0][0]:F[P.top().second][i]);

            P.push( make_pair(cur, i));
        }
    }

    printf("%d", F[n][k]);
}

Compilation message (stderr)

blocks.cpp: In function 'int main()':
blocks.cpp:12:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d", &n, &k);
     ~~~~~^~~~~~~~~~~~~~~~
blocks.cpp:15:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d", &a[i]);
         ~~~~~^~~~~~~~~~~~~

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