Блог пользователя Stalin69

Автор Stalin69, история, 2 недели назад, По-английски
  • I was solving this problem from the last 2 hour almost -> 1334C - Circle of Monsters
  • I made quite submissions but I was getting TLE for my code.
  • Then I looked for some red coders solution and the thing is the logic and implementation was same, but I still submit the red coder's code and I'm surprised that IT STILL GOT TLE WHY ?
#include<bits/stdc++.h>
using namespace std;

#define ll long long
#define ff first
#define ss second

void solve() {
    ll n; cin >> n;
    vector<ll> a(n), b(n);
    for (ll i = 0; i < n; i++)
        cin >> a[i] >> b[i];
    vector<ll> cost(n, 0);
    for (ll i = 0; i < n; i++)
        cost[i] = max(0LL, a[i] - b[(i + n - 1) % n]);

    ll sum = accumulate(cost.begin(), cost.end(), 0LL);
    ll ans = (ll)1e18;
    for (ll i = 0; i < n; i++) {
        ans = min(ans, sum - cost[i] + a[i]);
    }
    cout << ans << endl;
}

int main() {
#ifndef ONLINE_JUDGE
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
#endif
    ll tc;
    cin >> tc;
    while (tc--)
        solve();
    return 0;
}
  • I don't know what's the problem in this very simple and clean code and still I'm facing this issue.
  • Can anyone please consider this problem and tell me, why it is giving me TLE ?
  • Проголосовать: нравится
  • +1
  • Проголосовать: не нравится

»
2 недели назад, # |
  Проголосовать: нравится 0 Проголосовать: не нравится

Use fast IO

  • »
    »
    2 недели назад, # ^ |
      Проголосовать: нравится 0 Проголосовать: не нравится

    Yeah It works. But How ? What's the purpose of this, although the code was in perfect O(N).

    • »
      »
      »
      2 недели назад, # ^ |
        Проголосовать: нравится 0 Проголосовать: не нравится

      The maximum amount of input for this problem is around 1e6, you need fastIO for data like this. cin/cout are much slower than printf that they may cause TLE unless you add ios::sync_with_stdio(0)

    • »
      »
      »
      2 недели назад, # ^ |
        Проголосовать: нравится +4 Проголосовать: не нравится

      by the way you should never use endl, it's even slower than cin/cout because some buffer stuff, use '\n' instead.