Submission #938110

#	Time	Username	Problem	Language	Result	Execution time	Memory
938110		asdasdqwer	Towns (IOI15_towns)	C++14	0 / 100	22 ms	1368 KiB

towns

#include "towns.h"

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

#define pii array<int,2>
vector<vector<int>> dis;
map<pii,int> mp;

int query(int a, int b) {
    if (mp.find({a,b}) != mp.end()) {
        return mp[{a,b}];
    }

    if (mp.find({b,a}) != mp.end()) {
        return mp[{b,a}];
    }

    int d = getDistance(a, b);
    mp[{a,b}] = d;
    return d;
}

int hubDistance(int N, int sub) {
    dis.assign(N, vector<int>(N, 1e9));
    for (int i=0;i<N;i++) {
        dis[i][i] = 0;
    }

    for (int i=0;i<N;i++) {
        for (int j=i+1;j<N;j++) {
            dis[i][j] = dis[j][i] = query(i, j);
        }
    }

    int retVal = 0;
    pii foundPos = {-1, -1};
    // find maximum value and respective nodes
    for (int i=0;i<N;i++) {
        for (int j=i+1;j<N;j++) {
            if (dis[i][j] > retVal) {
                retVal = dis[i][j];
                foundPos = {i, j};
            }
        }
    }
    
    int mxDis = retVal;
    for (int i=0;i<N;i++) {
        if (i == foundPos[0] || i == foundPos[1]) continue;
        int q1 = query(foundPos[0], i);
        int q2 = query(foundPos[1], i);
        int sum = q1 + q2;
        int weightTo = (sum - retVal) / 2;
        mxDis = min(mxDis, max(q1 - weightTo, q2 - weightTo));
    }

    return mxDis;
}

Compilation message (stderr)

towns.cpp: In function 'int hubDistance(int, int)':
towns.cpp:24:28: warning: unused parameter 'sub' [-Wunused-parameter]
   24 | int hubDistance(int N, int sub) {
      |                        ~~~~^~~

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