Submission #1055295

#	Time	Username	Problem	Language	Result	Execution time	Memory
1055295		phong	Secret (JOI14_secret)	C++17	100 / 100	264 ms	14936 KiB

secret

//#pragma GCC optimize("Ofast")
//#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,avx2,fma")
//#pragma GCC optimize("unroll-loops")
#include<bits/stdc++.h>
#include "secret.h"

#define ll long long
const int nmax = 1000 + 5;

using namespace std;

int n, a[nmax];
int L[nmax << 2][nmax], R[nmax << 2][nmax];
//int Secret(int a, int b){
//}
void build(int id, int l, int r){
    if(l == r) return;
    int mid = r + l >> 1;
    L[id][mid] = a[mid];
    R[id][mid + 1] = a[mid + 1];
    for(int i = mid - 1; i >= l; --i) L[id][i] = Secret(a[i],L[id][i + 1]);
    for(int i = mid + 2; i <= r; ++i) R[id][i] = Secret(R[id][i - 1], a[i]);
    build(id << 1, l, mid);
    build(id << 1| 1, mid + 1, r);
}
int get(int id, int l, int r, int u, int v){
    int mid = r + l >> 1;

    if(u <= mid && mid + 1 <= v) return Secret(L[id][u], R[id][v]);
    if(u == mid + 1) return R[id][v];
    if(v== mid) return L[id][u];
    if(mid < u) return get(id << 1 | 1, mid + 1, r, u, v);
    if(mid + 1 > v) return get(id << 1, l, mid, u, v);
    return get(id << 1, l, mid, u, v)+ get(id << 1 | 1, mid + 1, r, u, v);
}
void Init(int N, int A[]){
    n = N;
    for(int i = 0; i < n; ++i) a[i] = A[i];
    build(1, 0, n - 1);

}
int Query(int l, int r){
    if(l == r) return a[l];
    return get(1, 0, n - 1, l, r);
}

Compilation message (stderr)

secret.cpp: In function 'void build(int, int, int)':
secret.cpp:18:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   18 |     int mid = r + l >> 1;
      |               ~~^~~
secret.cpp: In function 'int get(int, int, int, int, int)':
secret.cpp:27:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   27 |     int mid = r + l >> 1;
      |               ~~^~~

• Subtask 1: 100 / 100