Submission #886835

#	Time	Username	Problem	Language	Result	Execution time	Memory
886835		anha3k25cvp	Bali Sculptures (APIO15_sculpture)	C++14	100 / 100	373 ms	16472 KiB

sculpture

#include <bits/stdc++.h>
#define ll long long
#define ull unsigned long long
#define dl double
#define st first
#define nd second
#define II pair <int, int>

using namespace std;

const int N = 1 + 2e3;
const int inf = 7 + 1e9;

int main() {
#define TASKNAME "code"
    ios_base :: sync_with_stdio (0);
    cin.tie (0);
    if ( fopen( TASKNAME".inp", "r" ) ) {
        freopen (TASKNAME".inp", "r", stdin);
        freopen (TASKNAME".out", "w", stdout);
    }
    int n, L, R;
    cin >> n >> L >> R;
    vector <ll> a(n + 1, 0);
    for (int i = 1; i <= n; i ++) {
        cin >> a[i];
        a[i] += a[i - 1];
    }
    ll ans = 0;
    vector <int> ok(41, 0);
    vector <vector <int>> OK(n + 1, vector <int> (n + 1, 1));
    int ma = 42;
    while (1) {
        int lo = 0, hi = ma;
        while (lo < hi) {
            int mid = (lo + hi) / 2, bit = mid - 1;
            vector <int> mi(n + 1, inf), ma(n + 1, 0);
            mi[0] = 0;
            ma[0] = 0;
            for (int j = 0; j <= n; j ++)
                if (mi[j] <= R)
                    for (int i = j + 1; i <= n; i ++) {
                        if (!OK[j][i])
                            continue;
                        ll val = a[i] - a[j];
                        int check = 1;
                        for (int pos = bit + 1; pos < 41; pos ++)
                            if (((val >> pos) & 1) && !ok[pos]) {
                                check = 0;
                                break;
                            }
                        if (!check)
                            continue;
                        mi[i] = min(mi[i], mi[j] + 1);
                        ma[i] = max(ma[i], ma[j] + 1);
                    }
            if (mi[n] <= R && ma[n] >= L)
                hi = mid;
            else
                lo = mid + 1;
        }
        int bit = lo - 1;
        if (bit < 0) {
            cout << ans;
            return 0;
        }
        for (int i = 1; i <= n; i ++)
            for (int j = 0; j < i; j ++) {
                if (!OK[j][i])
                    continue;
                ll val = a[i] - a[j];
                int check = 1;
                for (int pos = bit + 1; pos < 41; pos ++)
                    if (((val >> pos) & 1) && !ok[pos])
                        OK[j][i] = 0;
            }
        ma = bit;
        ok[bit] = 1;
        ans += (ll)1 << bit;
    }
    return 0;
}

Compilation message (stderr)

sculpture.cpp: In function 'int main()':
sculpture.cpp:72:21: warning: unused variable 'check' [-Wunused-variable]
   72 |                 int check = 1;
      |                     ^~~~~
sculpture.cpp:19:17: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   19 |         freopen (TASKNAME".inp", "r", stdin);
      |         ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
sculpture.cpp:20:17: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   20 |         freopen (TASKNAME".out", "w", stdout);
      |         ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 9 / 9
• Subtask 2: 16 / 16
• Subtask 3: 21 / 21
• Subtask 4: 25 / 25
• Subtask 5: 29 / 29