Submission #1476770

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Source Code Expand

#include <cstdio>
#include <deque>
#include <stack>
#define repeat(i, n) for (int i = 0; (i) < int(n); ++(i))
#define whole(x) begin(x), end(x)
using ll = long long;
using namespace std;

int main() {
    ll n; scanf("%lld", &n);
    stack<bool> stk;
    for (ll i = n; i; i >>= 1) stk.push(i & 1);
    deque<int> x, y;
    int next = 1;
    while (not stk.empty()) {
        bool i = stk.top(); stk.pop();
        x.push_back(next);
        y.push_back(next);
        ++ next;
        if (i) {
            x.push_front(next);
            y.push_back(next);
            ++ next;
        }
    }
    x.insert(x.end(), whole(y));
    printf("%d\n", int(x.size()));
    repeat (i, x.size()) {
        printf("%d%c", x[i], i + 1 == x.size() ? '\n' : ' ');
    }
    return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:10:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     ll n; scanf("%lld", &n);
                            ^

Judge Result