Submission #1069471

#	Time	Username	Problem	Language	Result	Execution time	Memory
1069471		Boycl07	Secret (JOI14_secret)	C++17	100 / 100	338 ms	4604 KiB

secret

#include "secret.h"
#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
#define rep(i, n) for(int i = 1; (i) <= (n); ++i)
#define forn(i, l, r) for(int i = (l); i <= (r); ++i)
#define ford(i, r, l) for(int i = (r); i >= (l); --i)
#define FOR(i, n) for(int i = 0; i < (n); ++i)
#define FORD(i, n) for(int i = ((n) - 1); i >= 0; --i)
#define fi first
#define se second
#define pii pair<int, int>
#define pll pair<ll, ll>
#define pb push_back
#define endl "\n"
#define task "FFILL"
#define sz(a) int(a.size())
#define C(x, y) make_pair(x, y)
#define all(a) (a).begin(), (a).end()
#define bit(i, mask) (mask >> i & 1)

template<typename T> bool maximize(T &res, const T &val) { if (res < val){ res = val; return true; }; return false; }
template<typename T> bool minimize(T &res, const T &val) { if (res > val){ res = val; return true; }; return false; }

const int Max_N = 1e3 + 1;
const int LOG = 9;

int n, a[Max_N];

int st[Max_N][LOG + 1], pos[Max_N];

void dnc(int l, int r, int stage)
{
    if(l == r) return;

    int mid = l + r >> 1;
    st[mid][stage] = a[mid];
    st[mid + 1][stage] = a[mid + 1]; pos[mid + 1] |= (1 << stage);
    ford(i, mid - 1, l) st[i][stage] = Secret(a[i], st[i + 1][stage]);
    forn(i, mid + 2, r) st[i][stage] = Secret(st[i - 1][stage], a[i]), pos[i] |= (1 << stage);
    dnc(l, mid, stage + 1);
    dnc(mid + 1, r, stage + 1);
}

void Init(int N, int A[])
{
    n = N;
    FOR(i, n) a[i] = A[i];
    dnc(0, n - 1, 0);
}

int Query(int l, int r)
{
    if(l == r) return a[l];
    int stage = __builtin_ctz(pos[l] ^ pos[r]);
    return Secret(st[l][stage], st[r][stage]);
}

Compilation message (stderr)

secret.cpp: In function 'void dnc(int, int, int)':
secret.cpp:37:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   37 |     int mid = l + r >> 1;
      |               ~~^~~

• Subtask 1: 100 / 100