Submission #585468

#	Time	Username	Problem	Language	Result	Execution time	Memory
585468		messiuuuuu	Palembang Bridges (APIO15_bridge)	C++17	22 / 100	47 ms	2672 KiB

bridge

#include<bits/stdc++.h>
#define task "A"
#define ll long long
#define ld long double
#define fi first
#define se second
#define pb push_back
using namespace std;
const int MAXN = 1e5 + 5;
const ll INF = 1e18 + 5;

int n, k;
struct TRoad
{
    char h, o;
    ll ph, po;
}a[MAXN];

void Input()
{
    cin >> k >> n;
    for (int i = 1; i <= n; i++)
    {
        cin >> a[i].h >> a[i].ph >> a[i].o >> a[i].po;
    }
}

ll Cal1(int c1, int c2)
{
    ll res = 0;
    for (int i = 1; i <= n; i++)
    {
        if (a[i].h == a[i].o)
        {
            res += abs(a[i].ph - a[i].po);
        } else
        {
            res += min(abs(a[i].ph - c1) + abs(a[i].po - c1) + 1, abs(a[i].ph - c2) + abs(a[i].po - c2) + 1);
        }
    }
    return res;
}

ll Cal(int p)
{
    if (k == 1)
    {
        return Cal1(p, -2e9);
    }
    int l = p + 1, r = 1e9;
    while (l <= r)
    {
        int mid = (l + r) / 2;
        if (mid == 1e9)
            break;
        if (Cal1(p, mid) > Cal1(p, mid + 1))
        {
            l = mid + 1;
        } else
            r = mid - 1;
    }
    //cout << l << '\n';
    return Cal1(p, l);
}

void Solve()
{
    int l = 0, r = 1e9;
    //cout << Cal(4) << '\n';

    while (l <= r)
    {
        int mid = (l + r) / 2;
        if (mid == 1e9)
            break;
        if (Cal(mid) >= Cal(mid + 1))
            l = mid + 1;
        else
            r = mid - 1;
    }
    cout << Cal(l);

}

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    if (fopen(task".INP","r"))
    {
        freopen(task".INP","r",stdin);
        //freopen(task".OUT","w",stdout);
    }
    Input();
    Solve();
}

Compilation message (stderr)

bridge.cpp: In function 'int main()':
bridge.cpp:91:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   91 |         freopen(task".INP","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 8 / 8
• Subtask 2: 14 / 14
• Subtask 3: 0 / 9
• Subtask 4: 0 / 32
• Subtask 5: 0 / 37