제출 #1168530

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1168530		quangminh412	Self Study (JOI22_ho_t2)	C++20	0 / 100	0 ms	328 KiB

Main

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

/*
  Ben Watson
  Handle codeforces : quangminh98

  Mua Code nhu mua Florentino !!
*/

#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
const int maxn = 3e5;

int n, m;
int a[maxn + 1], b[maxn + 1];

bool can(ll k)
{
    ll require = 0;
    for (int i = 1; i <= n; i++)
    {
        ll mx = max(a[i], b[i]);

        if (mx * m >= k)
            require += m - ((k + mx - 1) / mx);
        else
            require -= (k - mx * m + b[i] - 1) / b[i];
    }

    return (require >= 0);
}

void solve()
{
    cin >> n >> m;
    for (int i = 1; i <= n; i++) cin >> a[i] >> b[i];

    ll l = 0, r = 1e18;
    ll res = -1;
    while (l <= r)
    {
        ll mid = l + (r - l) / 2;

        if (can(mid))
        {
            res = mid;
            l = mid + 1;
        } else
            r = mid - 1;
    }

    cout << res << '\n';
}

컴파일 시 표준 에러 (stderr) 메시지

Main.cpp: In function 'int main()':
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 + ".inp").c_str(), "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:21:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   21 |         freopen((name + ".out").c_str(), "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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