Submission #1040446

#	Time	Username	Problem	Language	Result	Execution time	Memory
1040446		Neco_arc	K blocks (IZhO14_blocks)	C++17	100 / 100	91 ms	3804 KiB

blocks

#include <bits/stdc++.h>
#ifdef LOCAL
#include <bits/debug.hpp>
#endif // LOCAL

#define ll long long
#define all(x) x.begin(), x.end()
#define Neco "K blocks"
#define resp(x) sort(all(x)), x.resize(unique(all(x)) - x.begin())
#define getbit(x,i) ((x >> i)&1)
#define _left id * 2, l, mid
#define _right id * 2 + 1, mid + 1, r
#define cntbit(x) __builtin_popcountll(x)
#define fi(i, a, b) for(int i = a; i <= b; i++)
#define fid(i, a, b) for(int i = a; i >= b; i--)
#define maxn (int) 1e5 + 7

using namespace std;

const ll mod = 1e9 + 7; //972663749
const ll base = 911382323;

int n, k;
int a[maxn];
pair<int, ll> q[maxn];
ll dp[2][maxn];

void solve()
{

    cin >> n >> k;
    fi(i, 1, n) cin >> a[i];


    int pre = 0, cur = 1;

    memset(dp, 60, sizeof dp);
    dp[0][0] = 0;

    fi(t, 1, k) {
        int top = 0;
        dp[cur][0] = 1e9;

        fi(i, 1, n)
        {
            dp[cur][i] = 1e9;

            ll Min = dp[pre][i - 1];
            while(top && a[i] >= a[q[top].first]) {
                Min = min(q[top].second, Min);
                --top;
            }

            dp[cur][i] = Min + a[i];
            if(top) dp[cur][i] = min(dp[cur][i], dp[cur][q[top].first]);

            q[++top] = {i, Min};
        }
        swap(pre, cur);

    }

    cout << dp[pre][n];

}


int main()
{

    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);

    if(fopen(Neco".inp", "r")) {
        freopen(Neco".inp", "r", stdin);
        freopen(Neco".out", "w", stdout);
    }


    int nTest = 1;
//    cin >> nTest;


    while(nTest--)
    {
        solve();
    }


    return 0;
}

Compilation message (stderr)

blocks.cpp: In function 'int main()':
blocks.cpp:76:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   76 |         freopen(Neco".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
blocks.cpp:77:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   77 |         freopen(Neco".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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