[Link] https://AtCoder.jp/contests/arc135/tasks/arc135_c
IDEA
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import java.util.*;
import java.io.*;
public class Main {
static BufferedReader br;
static StringBuilder sb = new StringBuilder();
public static void main(String[] args) throws IOException {
br = new BufferedReader(new InputStreamReader(System.in));
var n = toi(br.readLine());
var arr = getArr();
var bitCnt = new int[30];
var sum = 0l;
for(int e: arr) {
int digit = 0;
while(e > 0) {
if((e & 1) == 1) bitCnt[digit]++;
digit++;
e >>= 1;
}
}
for(var e: arr) sum += e;
for(var i = 0; i < n; i++) {
long tmp = 0;
for(var j = 0; j < 30; j++) {
if((arr[i] & 1 << j) == 0) tmp += (1 << j) * bitCnt[j];
else tmp += (1 << j) * (n - bitCnt[j]);
}
sum = Math.max(sum, tmp);
}
println(sum);
}
static int toi(String s) { return Integer.parseInt(s); }
static long tol(String s) { return Long.parseLong(s); }
static String[] getLine() throws IOException { return br.readLine().split(" "); }
static int[] getArr() throws IOException { return Arrays.stream(br.readLine().split(" ")).mapToInt(Integer::parseInt).toArray(); }
static <T> void print(T s) { System.out.print(s); }
static <T> void println(T s) { System.out.println(s); }
}