Codeforces Round #344 (Div. 2) A. Interview
题意:
给你2*n的矩阵
然后定义一个函数f(a,l,r)表示a数组在l到r的或值
然后让你找到一对l,r,使得f(a,l,r)+f(b,l,r)最大
思路:
直接或所有数
1 #include<cstdio> 2 #include<cstring> 3 #include<algorithm> 4 #include<iostream> 5 #include<cstdlib> 6 #include<string> 7 #include<cmath> 8 #include<vector> 9 using namespace std; 10 const int maxn=1e5+7; 11 const double eps=1e-8; 12 const double pi=acos(-1); 13 #define ll long long 14 const int MOD = 10000; 15 16 int n; 17 18 int main() 19 { 20 scanf("%d",&n); 21 ll ans=0; 22 ll x=0; 23 for(int i=0; i<n; i++) 24 { 25 ll y; 26 scanf("%I64d",&y); 27 x|=y; 28 } 29 ans+=x; 30 x=0; 31 for(int i=0; i<n; i++) 32 { 33 ll y; 34 scanf("%I64d",&y); 35 x|=y; 36 } 37 ans+=x; 38 printf("%I64d\n",ans); 39 return 0; 40 }