Stalin69's blog

Getting TLE for problem (Circle of Monsters) though I've used the red coder's code,still WHY ?
By Stalin69, history, 13 days ago, In English
  • 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 ?
  • Vote: I like it
  • +1
  • Vote: I do not like it

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13 days ago, # |
  Vote: I like it 0 Vote: I do not like it

Use fast IO

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    13 days ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

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

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      13 days ago, # ^ |
        Vote: I like it 0 Vote: I do not like it

      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)

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      13 days ago, # ^ |
        Vote: I like it +4 Vote: I do not like it

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

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        13 days ago, # ^ |
          Vote: I like it +4 Vote: I do not like it

        "never" is a strong word. endl could be used in interactives.

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