hdu 6186

Posted 2020-10-05 早知如此绊人心，何如当初莫相识。

题意：给出一个数列，q个询问，每个询问给出个下标，问除了该下标的数字，其他数字的and,or,xor是多少

思路：求个前缀，后缀即可

 1 #include<bits/stdc++.h>
 2 using namespace std;
 3 typedef long long ll;
 4 const int N=1e5+10;
 5 
 6 int a[N],b[N],c[N];
 7 int a1[N],b1[N],c1[N];
 8 int d[N];
 9 
10 int main(){
11     int n,m;
12    while(scanf("%d%d",&n,&m)!=EOF){
13        // a[0]=b[0]=c[0]=0;
14       //  a1[n+1]=b1[n+1]=c1[n+1]=0;
15         for(int i=1;i<=n;i++){
16             scanf("%d",&d[i]);
17             if(i==1) {
18                 a[i]=b[i]=c[i]=d[i];continue;
19             }
20             a[i]=d[i]&a[i-1];
21             b[i]=d[i]|b[i-1];
22             c[i]=d[i]^c[i-1];
23         }
24         for(int i=n;i>=1;i--){
25              if(i==n) {
26                 a1[i]=b1[i]=c1[i]=d[i];continue;
27             }
28             a1[i]=d[i]&a1[i+1];
29             b1[i]=d[i]|b1[i+1];
30             c1[i]=d[i]^c1[i+1];
31         }
32         int x;
33         for(int i=1;i<=m;i++){
34             scanf("%d",&x);
35             if(x==1){
36                 printf("%d %d %d\n",a1[x+1],b1[x+1],c1[x+1]);continue;
37             }
38             if(x==n){
39                 printf("%d %d %d\n",a[x-1],b[x-1],c[x-1]);continue;
40             }
41             printf("%d ",a[x-1]&a1[x+1]);
42             printf("%d ",b[x-1]|b1[x+1]);
43             printf("%d",c[x-1]^c1[x+1]);
44             printf("\n");
45         }
46 
47    }
48 }