oj.uz

Submission #442921

# Submission time Handle Problem Language Result Execution time Memory
442921 2021-07-09T10:55:48 Z BeanZ K blocks (IZhO14_blocks) C++14
0 / 100
 1 ms 332 KB 
// I_Love_LPL 11m
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define endl '\n'
const int N = 1e5 + 5;
long long mod = 1000007;
const int lim = 4e5 + 5;
const int lg = 20;
const int base = 311;
const long double eps = 1e-6;
ll mx[N][lg + 1], dp[N][105], a[N];
ll get(ll l, ll r){
    ll l2 = __lg(r - l + 1);
    return max(mx[l][l2], mx[r - (1 << l2) + 1][l2]);
}
void DP(ll t, ll l, ll r, ll optl, ll optr){
    if (l > r) return;
    ll mid = (l + r) >> 1;
    dp[mid][t] = 1e18;
    ll opt;
    for (int i = optl; i <= min(optr, mid - 1); i++){
        ll cost = dp[i][t - 1] + get(i, mid);
        if (dp[mid][t] > cost){
            dp[mid][t] = cost;
            opt = i;
        }
    }
    DP(t, l, mid - 1, optl, opt);
    DP(t, mid + 1, r, opt, optr);
}
int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    if (fopen("tests.inp", "r")){
        freopen("test.inp", "r", stdin);
        freopen("test.out", "w", stdout);
    }
    ll n, k;
    cin >> n >> k;
    for (int i = 1; i <= n; i++){
        cin >> a[i];
        mx[i][0] = a[i];
    }
    for (int i = 1; i <= lg; i++){
        for (int j = 1; (j + (1 << i) - 1) <= n; j++){
            mx[j][i] = max(mx[j][i - 1], mx[j + (1 << (i - 1))][i - 1]);
        }
    }
    for (int i = 1; i <= n; i++){
        dp[i][1] = max(dp[i - 1][1], a[i]);
    }
    for (int i = 2; i <= k; i++){
        DP(i, 1, n, 1, n);
    }
    cout << dp[n][k];
}
/*
Ans:

Out:
*/

Compilation message

blocks.cpp: In function 'int main()':
blocks.cpp:36:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   36 |         freopen("test.inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
blocks.cpp:37:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   37 |         freopen("test.out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
blocks.cpp: In function 'void DP(long long int, long long int, long long int, long long int, long long int)':
blocks.cpp:29:7: warning: 'opt' may be used uninitialized in this function [-Wmaybe-uninitialized]
   29 |     DP(t, l, mid - 1, optl, opt);
      |     ~~^~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 332 KB Output is correct
2 Correct 0 ms 332 KB Output is correct
3 Correct 1 ms 332 KB Output is correct
4 Incorrect 0 ms 332 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #2
0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 332 KB Output is correct
2 Correct 0 ms 332 KB Output is correct
3 Correct 0 ms 332 KB Output is correct
4 Incorrect 1 ms 332 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #3
0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 332 KB Output is correct
2 Correct 0 ms 332 KB Output is correct
3 Correct 1 ms 332 KB Output is correct
4 Incorrect 0 ms 332 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #4
0 / 47.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 332 KB Output is correct
2 Correct 0 ms 332 KB Output is correct
3 Correct 1 ms 332 KB Output is correct
4 Incorrect 0 ms 332 KB Output isn't correct
5 Halted 0 ms 0 KB -