Submission #172658

#	Time	Username	Problem	Language	Result	Execution time	Memory
172658		Swan	K blocks (IZhO14_blocks)	C++14	100 / 100	229 ms	42984 KiB

blocks

#include<bits/stdc++.h>
#include <cstdio>
#include <cstring>
#include <stack>
#include <algorithm>
using namespace std;

int dp[105][100005];
int a[100005];
int n,k;

int main(){
    scanf("%d %d",&n,&k);
    int maxv = 0;
    memset(dp,0x3f,sizeof(dp));
    for (int i=1; i<=n; i++) {
        scanf("%d",&a[i]);
        maxv = max(maxv,a[i]);
        dp[1][i] = maxv;
    }
    for (int i=2; i<=k; i++) {
        stack<int> s1,s2;
        for (int j=1; j<=n; j++) {
            //cout << j << ' ' << s1.size() << endl;
            int my_dp = dp[i-1][j-1];
            while (!s1.empty() && s1.top() < a[j]) {
                my_dp = min(my_dp,s2.top());
                s1.pop();
                s2.pop();
            }
            if(s1.empty() || my_dp + a[j] < s1.top() + s2.top()){
                s1.push(a[j]);
                s2.push(my_dp);
            }
            if(j >= i) dp[i][j] = s1.top() + s2.top();
        }
    }
    printf("%d",dp[k][n]);
}
/*
6 2
1 2 3 4 5 6
*/

Compilation message (stderr)

blocks.cpp: In function 'int main()':
blocks.cpp:13:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d",&n,&k);
     ~~~~~^~~~~~~~~~~~~~~
blocks.cpp:17:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d",&a[i]);
         ~~~~~^~~~~~~~~~~~

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