oj.uz

Submission #1090778

# Submission time Handle Problem Language Result Execution time Memory
1090778 2024-09-18T18:07:24 Z ShaShi Hacker (BOI15_hac) C++17
100 / 100
 95 ms 45904 KB 
#include <bits/stdc++.h>
 
// #define int long long
 
// #pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
// #pragma GCC optimize("O3")
// #pragma GCC optimize("unroll-loops")
 
#define F first 
#define S second
#define mp make_pair
#define pb push_back
#define all(x) x.begin(), x.end()
#define kill(x) cout << x << "\n", exit(0);
#define pii pair<int, int>
#define endl "\n"
 
 
 
using namespace std;
typedef long long ll;
// typedef __int128_t lll;
typedef long double ld;
 
const int MAXN = (int)1e6 + 7;
const int MOD = (int)1e9 + 7;
const int INF = (int)1e9 + 7;
const int LG = 20;
 
 
int n, m, k, tmp, t, tmp2, tmp3, tmp4, u, v, w, flag, q, ans, flag2;
int arr[MAXN], ps[MAXN], dp[MAXN];
int sps[MAXN][LG];


inline int go_fw(int ind, int k) {
    if (ind+k-1 <= n) return ps[ind+k-1]-ps[ind-1];
    return ps[n]-ps[ind-1]+go_fw(1, k-(n-ind+1));
}


inline int get_mn(int v, int k) {
    int res = INF;
    
    for (int i=LG-1; i>=0; i--) {
        if (k&(1<<i)) {
            res = min(res, sps[v][i]);
            v += (1<<i);
        }
    }

    return res;
}


inline int solve(int ind) {
    int j = ind, res = INF;

    if (ind >= (n+1)/2) return get_mn(ind-(n+1)/2+1, (n+1)/2);
    return min(get_mn(1, ind), get_mn(n-((n+1)/2-ind)+1, (n+1)/2-ind));
}
 
int32_t main() {
    #ifdef LOCAL
    freopen("inp.in", "r", stdin);
    freopen("res.out", "w", stdout);
    #else
    ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    #endif

    cin >> n;

    for (int i=1; i<=n; i++) {
        cin >> arr[i]; tmp += arr[i];

        ps[i] = ps[i-1]+arr[i];
    }

    for (int i=1; i<=n; i++) sps[i][0] = go_fw(i, (n+1)/2);
    for (int j=1; j<LG; j++) for (int i=1; i<=n; i++) sps[i][j] = min(sps[i][j-1], sps[i+(1<<(j-1))][j-1]);

    ans = 0;

    for (int i=1; i<=n; i++) ans = max(ans, solve(i));

    cout << ans << endl;
 
    return 0;
}

Compilation message

hac.cpp: In function 'int solve(int)':
hac.cpp:57:9: warning: unused variable 'j' [-Wunused-variable]
   57 |     int j = ind, res = INF;
      |         ^
hac.cpp:57:18: warning: unused variable 'res' [-Wunused-variable]
   57 |     int j = ind, res = INF;
      |                  ^~~

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 0 ms 344 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 1 ms 348 KB Output is correct
8 Correct 0 ms 344 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 0 ms 348 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 0 ms 348 KB Output is correct
17 Correct 0 ms 348 KB Output is correct
18 Correct 0 ms 348 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 0 ms 344 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 1 ms 348 KB Output is correct
8 Correct 0 ms 344 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 0 ms 348 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 0 ms 348 KB Output is correct
17 Correct 0 ms 348 KB Output is correct
18 Correct 0 ms 348 KB Output is correct
19 Correct 1 ms 348 KB Output is correct
20 Correct 1 ms 348 KB Output is correct
21 Correct 1 ms 348 KB Output is correct
22 Correct 1 ms 604 KB Output is correct
23 Correct 1 ms 860 KB Output is correct
24 Correct 1 ms 604 KB Output is correct
25 Correct 1 ms 764 KB Output is correct
26 Correct 1 ms 860 KB Output is correct
27 Correct 0 ms 348 KB Output is correct
28 Correct 0 ms 348 KB Output is correct
29 Correct 0 ms 344 KB Output is correct
30 Correct 1 ms 860 KB Output is correct
31 Correct 1 ms 860 KB Output is correct

Subtask #3
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 1 ms 860 KB Output is correct
4 Correct 13 ms 7416 KB Output is correct
5 Correct 32 ms 18268 KB Output is correct
6 Correct 44 ms 23120 KB Output is correct
7 Correct 55 ms 27472 KB Output is correct
8 Correct 94 ms 45532 KB Output is correct

Subtask #4
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 0 ms 344 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 1 ms 348 KB Output is correct
8 Correct 0 ms 344 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 0 ms 348 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 0 ms 348 KB Output is correct
17 Correct 0 ms 348 KB Output is correct
18 Correct 0 ms 348 KB Output is correct
19 Correct 1 ms 348 KB Output is correct
20 Correct 1 ms 348 KB Output is correct
21 Correct 1 ms 348 KB Output is correct
22 Correct 1 ms 604 KB Output is correct
23 Correct 1 ms 860 KB Output is correct
24 Correct 1 ms 604 KB Output is correct
25 Correct 1 ms 764 KB Output is correct
26 Correct 1 ms 860 KB Output is correct
27 Correct 0 ms 348 KB Output is correct
28 Correct 0 ms 348 KB Output is correct
29 Correct 0 ms 344 KB Output is correct
30 Correct 1 ms 860 KB Output is correct
31 Correct 1 ms 860 KB Output is correct
32 Correct 0 ms 348 KB Output is correct
33 Correct 0 ms 348 KB Output is correct
34 Correct 1 ms 860 KB Output is correct
35 Correct 13 ms 7416 KB Output is correct
36 Correct 32 ms 18268 KB Output is correct
37 Correct 44 ms 23120 KB Output is correct
38 Correct 55 ms 27472 KB Output is correct
39 Correct 94 ms 45532 KB Output is correct
40 Correct 2 ms 1372 KB Output is correct
41 Correct 4 ms 2140 KB Output is correct
42 Correct 5 ms 3168 KB Output is correct
43 Correct 32 ms 18484 KB Output is correct
44 Correct 93 ms 45704 KB Output is correct
45 Correct 16 ms 9304 KB Output is correct
46 Correct 49 ms 27484 KB Output is correct
47 Correct 95 ms 45480 KB Output is correct
48 Correct 91 ms 45904 KB Output is correct
49 Correct 86 ms 45096 KB Output is correct
50 Correct 92 ms 45096 KB Output is correct