CodeForces 925 C Big Secret

Big Secret

题解:

若 cur ^ x > cur 则 x2进制下最高位的1 所对应cur的那个位置是0, 否则数字一定变小。

我们可以将每个数的最高位找出来。

然后我们从低位去check某位是不是0。

虽然对于每个数来说都只要考虑最高位就好了, 但是相对的最高位会影响比他低位置的数, 低位不会影响高位, 所以先填低位。

代码:

#include<bits/stdc++.h>
using namespace std;
#define Fopen freopen("_in.txt","r",stdin); freopen("_out.txt","w",stdout);
#define LL long long
#define ULL unsigned LL
#define fi first
#define se second
#define pb push_back
#define lson l,m,rt<<1
#define rson m+1,r,rt<<1|1
#define lch(x) tr[x].son[0]
#define rch(x) tr[x].son[1]
#define max3(a,b,c) max(a,max(b,c))
#define min3(a,b,c) min(a,min(b,c))
typedef pair<int,int> pll;
const int inf = 0x3f3f3f3f;
const int _inf = 0xc0c0c0c0;
const LL INF = 0x3f3f3f3f3f3f3f3f;
const LL _INF = 0xc0c0c0c0c0c0c0c0;
const LL mod =  (int)1e9+7;
const int N = 1e5 + 100;
vector<LL> vc[60];
LL ans[N], b[N];
int main(){
    int n;
    scanf("%d", &n);
    for(int i = 1; i <= n; ++i){
        scanf("%lld", &b[i]);
        for(int j = 59; j >= 0; --j)
            if((b[i]>>j)&1) {
                vc[j].pb(b[i]);
                break;
            }
    }
    LL cur = 0;
    for(int i = 1; i <= n; ++i){
        int  f = 0;
        for(int j = 0; j < 60; ++j){
            if(vc[j].size() && !((cur>>j) & 1)){
                ans[i] = vc[j].back();
                vc[j].pop_back();
                cur ^= ans[i];
                f = 1;
                break;
            }
        }
        if(!f){
            puts("No");
            return 0;
        }
    }
    puts("Yes");
    for(int i = 1; i <= n; ++i){
        printf("%lld%c", ans[i], " 
"[i==n]);
    }
    return 0;
}
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原文地址:https://www.cnblogs.com/MingSD/p/10906514.html