#include <bits/stdc++.h>
#include "secret.h"
const int N = 1e3 + 10;
int n, a[N], prer[10][N], prel[10][N];
//int Secret( int a, int b ) { return a + 2*( b/2); }
void solve( int l, int r, int cnt ) {
if( l == r ) return ;
int mid = l + r >> 1;
prer[cnt][mid+1] = a[mid+1];
prel[cnt][mid] = a[mid];
for( int i = mid - 1 ; i >= l ; i-- ) prel[cnt][i] = Secret( a[i], prel[cnt][i+1] );
for( int i = mid + 2 ; i <= r ; i++ ) prer[cnt][i] = Secret( prer[cnt][i-1], a[i] );
solve( l, mid, cnt+1 ), solve( mid+1, r, cnt+1 );
}
void Init( int N_, int A[] ) {
n = N_;
for( int i = 0 ; i < n ; i++ ) a[i] = A[i];
solve( 0, n-1, 1 );
}
int cal( int ll, int rr, int l, int r, int cnt ) {
int mid = l + r >> 1;
if( ll <= mid && mid + 1 <= rr ) return Secret( prel[cnt][ll], prer[cnt][rr] );
else if( rr <= mid ) return cal( ll, rr, l, mid, cnt + 1 );
else return cal( ll, rr, mid + 1, r, cnt + 1 );
}
int Query( int L, int R ) {
if( L == R ) return A[L];
else if( L + 1 == R ) return Secret( a[L+1], a[L] );
return cal( L, R, 0, n-1, 1 );
}
/*int main()
{
int n, x[N], q;
scanf("%d",&n);
for( int i = 0 ; i < n ; i++ ) scanf("%d",&x[i]);
Init( n, x );
scanf("%d",&q);
while( q-- ) {
int a, b;
scanf("%d %d",&a,&b);
printf("%d\n",Query( a, b ) );
}
}*/
Compilation message
secret.cpp: In function 'void solve(int, int, int)':
secret.cpp:11:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
int mid = l + r >> 1;
~~^~~
secret.cpp: In function 'int cal(int, int, int, int, int)':
secret.cpp:27:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
int mid = l + r >> 1;
~~^~~
secret.cpp: In function 'int Query(int, int)':
secret.cpp:34:25: error: 'A' was not declared in this scope
if( L == R ) return A[L];
^
