Eugeny and Array

Eugeny and Array

time limit per test
2 seconds

memory limit per test
256 megabytes

input
standard input

output
standard output

Eugeny has array a = a1, a2, ..., an,
consisting of n integers. Each integer ai equals
to -1, or to 1. Also, he has m queries:

Query number i is given as a pair of integers li, ri (1 ≤ li ≤ ri ≤ n).

The response to the query will be integer 1, if the elements of array a can
be rearranged so as the sum ali + ali + 1 + ... + ari = 0,
otherwise the response to the query will be integer 0.

Help Eugeny, answer all his queries.

Input

The first line contains integers n and m (1 ≤ n, m ≤ 2·105).
The second line contains n integers a1, a2, ..., an (ai = -1, 1).
Next mlines contain Eugene's queries. The i-th line
contains integers li, ri (1 ≤ li ≤ ri ≤ n).

Output

Print m integers — the responses to Eugene's queries in the order they occur in the input.

Sample test(s)

input

2 3
1 -1
1 1
1 2
2 2

output

0
1
0

input

5 5
-1 1 1 1 -1
1 1
2 3
3 5
2 5
1 5

output

0
1
01
0

思路:询问的的长度是  -1的1的最少数的2倍以内则可以.

#include <algorithm>
#include <iostream>
#include <iomanip>
#include <cstdio>
#include <cmath>
#include <cstdlib>
#include <cstring>
typedef long long ll;
#define clr(a) memset((a),0,sizeof (a))
#define rep(i,a,b) for(int i=(a);i<(int)(b);i++)
#define per(i,a,b) for(int i=((a)-1);i>=(int)(b);i--)
#define inf 0x7ffffff
#define eps 1e-6
using namespace std;
int n,m;
int a[200005];
int main(){
int n,m;
int fu=0,zhen=0;
cin>>n>>m;
int ai;
for(int i=0;i<n;i++){
cin>>ai;
if(ai<0)
fu++;
else zhen++;
}
int maxn=min(fu,zhen);
int p,q;
while(m--){
cin>>p>>q;
int cnt=q-p+1;
if(cnt&1)cout<<0<<endl;
else if((cnt/2)>maxn)cout<<0<<endl;
else cout<<1<<endl;
}
//system("pause");
return 0;
}