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void update (int id, int val) {
  int cur = val - a[id];
  a[id] = val;
  for (; id <= n; id = (id | (id + 1)))
    f[id] += cur;
}

Main.java:1: error: class, interface, or enum expected
void update (int id, int val) {
^
Main.java:1: error: class, interface, or enum expected
void update (int id, int val) {
     ^
Main.java:3: error: class, interface, or enum expected
  a[id] = val;
  ^
Main.java:4: error: class, interface, or enum expected
  for (; id <= n; id = (id | (id + 1)))
  ^
Main.java:4: error: class, interface, or enum expected
  for (; id <= n; id = (id | (id + 1)))
         ^
Main.java:4: error: class, interface, or enum expected
  for (; id <= n; id = (id | (id + 1)))
                  ^
Main.java:6: error: class, interface, or enum expected
}
^
7 errors

Standard output is empty