Submission #1055240

#	Time	Username	Problem	Language	Result	Execution time	Memory
1055240		phong	Secret (JOI14_secret)	C++17	0 / 100	277 ms	14952 KiB

secret

#include<bits/stdc++.h>
#include "secret.h"

#define ll long long
const int nmax =  1e3+ 5;

using namespace std;

int n, a[nmax];
int L[1 << 11][nmax], R[1 << 11][nmax];
//int Secret(int a, int b){
//    if(a > b) swap(a, b);
//    if(a == 4 && b == 7) return 10;
//    if(a == 1 && b == 10) return 11;
//    if(a == 2 && b == 11) return 13;
//    return 0;
//}

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(L[id][i + 1], a[i]);
    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){
    if(u == v) return a[u];
    if(l > v || r < u) return 0;

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

Compilation message (stderr)

secret.cpp: In function 'void build(int, int, int)':
secret.cpp:21:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   21 |     int mid = r + l >> 1;
      |               ~~^~~
secret.cpp: In function 'int get(int, int, int, int, int)':
secret.cpp:34:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   34 |     int mid = r + l >> 1;
      |               ~~^~~

• Subtask 1: 0 / 100