提出 #74853487

---

ソースコード 拡げる

#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
typedef long long ll;
#define REP(i, n) for (int i = 0, i##_len = (n); i < i##_len; ++i)
#define FOR(i, a, b) for (int i = (a), i##_len = (b); i <= i##_len; ++i)
#define REV(i, a, b) for (int i = (a); i >= (b); --i)
int main() {
  int N;
  cin >> N;
  vector<ll> L(N);
  REP(i,N)cin >> L[i];


  int ans = 0;

  for (int bit = 0;bit < (1 << N);bit++) {
    vector<bool> is_r(N);
    for (int j = 0;j < N;j++) {
      if ((bit >> j) & 1)is_r[j] = true;
      else is_r[j] = false;
    }

    int cur_ans = 0;
    ll now = 1;
    REP(i,N) {
      ll before = now;
      ll sign = is_r[i] ? 1 : -1;
      ll next = now + 2 * L[i] * sign;

      if (before > 0 & next < 0 || before < 0 && next > 0)cur_ans++;
      now = next;
    }

    if (ans < cur_ans)ans = cur_ans;
  }

  cout << ans << endl;
}

提出情報

コンパイルエラー

./Main.cpp: In function 'int main()':
./Main.cpp:31:18: warning: suggest parentheses around comparison in operand of '&' [-Wparentheses]
   31 |       if (before > 0 & next < 0 || before < 0 && next > 0)cur_ans++;
      |           ~~~~~~~^~~
./Main.cpp:31:47: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   31 |       if (before > 0 & next < 0 || before < 0 && next > 0)cur_ans++;
      |                                    ~~~~~~~~~~~^~~~~~~~~~~

ジャッジ結果