Submission #333138

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
333138	2020-12-04 18:22:42	qwe854896	Strange Device (APIO19_strange_device)	C++14	65 / 100	842 ms	82256 KiB

strange_device

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#include<bits/stdc++.h>
#define endl '\n'
#define int long long
#define X first
#define Y second
using namespace std;
map <int, int> m;
signed main()
{
  ios::sync_with_stdio(0);
  cin.tie(0);
  int n, A, B;
  cin >> n >> A >> B;
  int ans = 0, MOD = log10(A) - log10(__gcd(A, B+1)) + log10(B) > 18 ? (long long)(1e18+1) : A / __gcd(A, B+1) * B;
  while (n--) {
    int l, r;
    cin >> l >> r;
    int L = l % MOD, R = r % MOD;
    if (L < R) m[L]++, m[R+1]--;
    else if (L > R) m[L]++, m[MOD]--, m[0]++, m[R+1]--;
    else if (l == r) m[L]++, m[L+1]--;
    else ans = MOD;
  }
  int sum = 0, f = 1, l;
  if (ans != MOD) {
    for (auto seg:m) {
      //cout << seg.X << ' ' << seg.Y << endl;
      sum += seg.Y;
 
 
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Compilation message (stderr)

strange_device.cpp: In function 'int main()':
strange_device.cpp:32:32: warning: 'l' may be used uninitialized in this function [-Wmaybe-uninitialized]
   32 |    else if (!sum) ans += seg.X - l, f = 1;
      |                          ~~~~~~^~~

• Subtask 1: 10 / 10
• Subtask 2: 0 / 5
• Subtask 3: 5 / 5
• Subtask 4: 5 / 5
• Subtask 5: 5 / 5
• Subtask 6: 20 / 20
• Subtask 7: 20 / 20
• Subtask 8: 0 / 30