Submission #1040336

#	Time	Username	Problem	Language	Result	Execution time	Memory
1040336		Yang8on	K blocks (IZhO14_blocks)	C++14	53 / 100	1073 ms	83420 KiB

blocks

#include <bits/stdc++.h>
#define Y8o "K blocks"
#define maxn (int) 1e5 + 5
#define ll long long
#define pii pair<ll, ll>
#define gb(i, j) ((i >> j) & 1)
#define all(x) x.begin(), x.end()
#define _left id * 2, l, mid
#define _right id * 2 + 1, mid + 1, r

//#define f first
//#define s second

using namespace std;

mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
ll GetRandom(ll l, ll r) {
    return uniform_int_distribution<ll> (l, r) (rng);
}
void iof() {
    if(fopen(Y8o".in", "r"))
    {
        freopen(Y8o".in", "r", stdin);
        freopen(Y8o".out", "w", stdout);
    }
    ios_base::sync_with_stdio(0);
    cin.tie(NULL), cout.tie(NULL);
}
void ctime() {
    cerr << "\n" << "\nTime elapsed: " << 1000 * clock() / CLOCKS_PER_SEC << "ms\n";
}


int n, k;
int a[maxn];
ll s[maxn], dp[105][maxn];

void solve()
{
    cin >> n >> k;
    for(int i = 1; i <= n; i ++) cin >> a[i], s[i] = s[i - 1] + a[i];

    memset(dp, 0x3f, sizeof dp);

    int mx2 = 0;
    for(int i = 1; i <= n; i ++) mx2 = max(mx2, a[i]), dp[1][i] = mx2;

    for(int i = 2; i <= k; i ++) {
        for(int j = 1; j <= n; j ++) {
            int mx = 0;
            for(int t = j; t >= 1; t --) {
                mx = max(mx, a[t]);
                dp[i][j] = min(dp[i][j], dp[i - 1][t - 1] + mx);
            }
        }
    }

    cout << dp[k][n];
}


int main()
{
    iof();

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

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

    ctime();
    return 0;
}

Compilation message (stderr)

blocks.cpp: In function 'void iof()':
blocks.cpp:23:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   23 |         freopen(Y8o".in", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
blocks.cpp:24:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   24 |         freopen(Y8o".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

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