Submission #284413

#	Time	Username	Problem	Language	Result	Execution time	Memory
284413		SamAnd	Towns (IOI15_towns)	C++17	25 / 100	31 ms	1152 KiB

towns

#include "towns.h"
#include <bits/stdc++.h>
using namespace std;
const int N = 115, INF = 1000000009;

int n;

int ans[N][N];
int qry(int x, int y)
{
    if (ans[x][y] != -1)
        return ans[x][y];
    return ans[x][y] = ans[y][x] = getDistance(x, y);
}

int hubDistance(int N_, int sub)
{
    n = N_;
    for (int i = 0; i < n; ++i)
    {
        for (int j = 0; j < n; ++j)
        {
            if (i == j)
                continue;
            ans[i][j] = -1;
        }
    }

    int maxu = -1;
    int maxx;
    for (int x = 0; x < n; ++x)
    {
        if (qry(0, x) > maxu)
        {
            maxu = qry(0, x);
            maxx = x;
        }
    }

    int u1 = maxx;
    maxu = -1;
    for (int x = 0; x < n; ++x)
    {
        if (qry(u1, x) > maxu)
        {
            maxu = qry(u1, x);
            maxx = x;
        }
    }

    int u2 = maxx;

    int R = INF;

    for (int x = 0; x < n; ++x)
    {
        int t1 = qry(u1, u2);
        int t2 = qry(u1, x);
        int t3 = qry(u2, x);

        R = min(R, max((t1 + t3 - t2) / 2, max((t1 + t2 - t3) / 2, (t2 + t3 - t1) / 2)));
    }

    return R;
}

Compilation message (stderr)

towns.cpp: In function 'int hubDistance(int, int)':
towns.cpp:16:29: warning: unused parameter 'sub' [-Wunused-parameter]
   16 | int hubDistance(int N_, int sub)
      |                         ~~~~^~~
towns.cpp:30:9: warning: 'maxx' may be used uninitialized in this function [-Wmaybe-uninitialized]
   30 |     int maxx;
      |         ^~~~

• Subtask 1: 13 / 13
• Subtask 2: 12 / 12
• Subtask 3: 0 / 13
• Subtask 4: 0 / 10
• Subtask 5: 0 / 13
• Subtask 6: 0 / 39