Submission #1281721

#	Time	Username	Problem	Language	Result	Execution time	Memory
1281721		quangminh412	Portal (BOI24_portal)	C++17	1 / 100	14 ms	1208 KiB

Main

/*
  Ben Watson

  Quang Minh MasterDDDDD
*/

#include <bits/stdc++.h>
using namespace std;

#define ll long long

const string name = "test";

void solve();
signed main()
{
    if (fopen((name + ".inp").c_str(), "r"))
    {
        freopen((name + ".inp").c_str(), "r", stdin);
        freopen((name + ".out").c_str(), "w", stdout);
    }
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);

    solve();

    return 0;
}

// main program
ll GCD(ll a, ll b) { return (b == 0 ? a : GCD(b, a % b)); }

ll a = 0, b = 0, c = 0;
void euclid(ll x, ll y)
{
    while (x)
    {
        ll t = a / x;
        a -= t * x;
        b -= t * x;
        swap(a, x);
        swap(b, y);
    }
    c = GCD(c, y);
    if (c != 0)
        b %= c;
}

void solve()
{
    int n; cin >> n;
    int X[n], Y[n];
    for (int i = 0; i < n; i++)
        cin >> X[i] >> Y[i];
    for (int i = 1; i < n; i++)
        euclid(X[i] - X[0], Y[i] - Y[0]);

    if (a == 0 || c == 0)
        cout << -1 << '\n';
    else
        cout << abs(a * c) << '\n';
}

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:19:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   19 |         freopen((name + ".inp").c_str(), "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:20:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   20 |         freopen((name + ".out").c_str(), "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 1 / 1
• Subtask 2: 0 / 10
• Subtask 3: 0 / 10
• Subtask 4: 0 / 29
• Subtask 5: 0 / 15
• Subtask 6: 0 / 35