Submission #935566

#	Time	Username	Problem	Language	Result	Execution time	Memory
935566		Baizho	Secret (JOI14_secret)	C++14	0 / 100	395 ms	8380 KiB

secret

#include <bits/stdc++.h>
using namespace std;
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
  
#define ordered_set tree<int, null_type,less_equal<int>, rb_tree_tag,tree_order_statistics_node_update>
 
// #pragma GCC optimize("Ofast,unroll-loops,fast-math")
// #pragma GCC target("popcnt")
 
 
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef pair<ll,ll> pll;
 
#define sz size()
#define ff first
#define ss second
#define all(a) a.begin(),a.end()
#define pb push_back
 
const int mod = ll(1e9)+7;
const ll MOD = 998244353;
const long long inf = 5e18;
const int M = 1005;

int Secret(int x, int y);

int val[M][M], n, a[M];

void solve(int l, int r) {
	if(l > r) return;
	if(l == r) {
		val[l][r] = a[l];
		return;
	}
	int mid = (l + r) / 2;
	val[mid][mid] = a[mid];
	val[mid + 1][mid + 1] = a[mid + 1];
	for(int i = mid - 1; i >= l; i --) val[i][mid] = Secret(val[i + 1][mid], a[i]);
	for(int i = mid + 2; i <= r; i ++) val[mid + 1][i] = Secret(val[mid + 1][i - 1], a[i]);
	solve(l, mid); solve(mid + 1, r);
}

void Init(int N, int A[]) {
	n = N;
	for(int i = 0; i < N; i ++) a[i] = A[i];
	solve(0, n - 1);
}

int Query(int L, int R) {
	int l = L, r = R, tl = 0, tr = n - 1;
	if(l == r) return a[l];
	while(tl <= tr) {
		int mid = (tl + tr) / 2;
		if(l <= mid && mid + 1 <= r) return Secret(val[l][mid], val[mid + 1][r]);
		else if(r <= mid) tr = mid;
		else tl = mid + 1; 
	}
}

Compilation message (stderr)

secret.cpp: In function 'int Query(int, int)':
secret.cpp:62:1: warning: control reaches end of non-void function [-Wreturn-type]
   62 | }
      | ^

• Subtask 1: 0 / 100