Submission #112151

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
112151	2019-05-17 15:49:29	dolphingarlic	Lun (COCI19_lun)	C++14	50 / 50	3 ms	384 KiB

lun

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#include <bits/stdc++.h>
#define FOR(i, x, y) for (ll i = x; i < y; i++)
#pragma GCC optimize("O3")
typedef long long ll;
using namespace std;
int dbl[10] = {0, 2, 4, 6, 8, 1, 3, 5, 7, 9};
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(0);
  int n;
  cin >> n;
  int tot = 0;
  bool needs_double = false;
  FOR(i, 0, n - 1) {
    char x;
    cin >> x;
    if (x == 'x') {
      needs_double = !((n - i) & 1);
    } else {
      tot += (!((n - i) & 1) ? dbl[x - '0'] : (x - '0'));
    }
  }
  char x;
  cin >> x;
  if (x == 'x') {
    cout << (tot * 9) % 10 << '\n';
  } else {
    if (needs_double) {
 
 
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• Subtask 1: 50 / 50