Submission #305670

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Source Code Expand

#include <bits/stdc++.h>

#define rep(i,n) for(int i=0;i<(int)(n);i++)
#define each(it,n) for(__typeof((n).begin()) it=(n).begin();it!=(n).end();++it)

using namespace std;

int digits[5];

int n;

vector<string> ans;

void doit(int d, int even) {
    if (d == n) {
        stringstream ss;
        rep(i, n) {
            ss << digits[i];
        }
        ans.push_back(ss.str());
        return;
    }

    if (d == 0) {
        rep(i, 10) {
            digits[d] = i;
            doit(d + 1, (even + i) % 2);
        }
        return;
    }

    if (even == 0) {
        rep(i, 10) {
            digits[d] = i;
            doit(d + 1, (even + i) % 2);
        }
    } else {
        rep(i, 10) {
            digits[d] = 9 - i;
            doit(d + 1, (even + 9 - i) % 2);
        }
    }
}

int main() {
    cin >> n;

    int a = 1;
    rep(i, n) {
        a *= 10;
    }
    a--;
    cout << a << endl;
    doit(0, 0);

    rep(i, ans.size()) {
        cout << ans[i] << endl;
    }
    return 0;
}

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