Submission #107670

#	Time	Username	Problem	Language	Result	Execution time	Memory
107670		dfistric	Sequence (BOI14_sequence)	C++14	0 / 100	4 ms	512 KiB

sequence

#include <bits/stdc++.h>

#define FOR(i, a, b) for (int i = (a); i < (b); i++)
#define FORd(i, a, b) for (int i = (a); i >= (b); i--)
#define REP(i, n) FOR(i, 0, n)
#define ll long long

using namespace std;

const int MAXN = 100100;
ll arr[MAXN];

int main() {
    ios_base::sync_with_stdio(false);
 
    int n;
    cin >> n;
    REP(i, n) cin >> arr[i];

    if (arr[0] != 9) {
        n--;
        int t = 1;
        while (t < n) t *= 10;

        if (arr[0] == 0) cout << 10 * t << "\n";
        else             cout << arr[0] * t << "\n";
    } else {
        int out = 8, curr = 1, inc = 10;
        while (curr < n) {
            curr += inc;
            out = out * 10 + 8;
            inc *= 10;
        }
        cout << out + 1 << "\n";
    }

    return 0;
}

• Subtask 1: 0 / 9
• Subtask 2: 0 / 33
• Subtask 3: 0 / 25
• Subtask 4: 0 / 33