Submission #432598

#	Time	Username	Problem	Language	Result	Execution time	Memory
432598		balbit	Towns (IOI15_towns)	C++14	0 / 100	19 ms	372 KiB

towns

#include "towns.h"

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

#define ll long long
#define pii pair<int, int>
#define f first
#define s second

#ifdef BALBIT
#define bug(...) cerr<<"#"<<__LINE__<<": "<<#__VA_ARGS__<<"- ", _do(__VA_ARGS__)
template<typename T> void _do( T && x) {cerr<<x<<endl;}
template<typename T, typename ...S> void _do( T && x, S && ...y) {cerr<<x<<", "; _do(y...);}
#else
#define bug(...)
#endif // BALBIT


#define ALL(x) (x).begin(), (x).end()
#define SZ(x) (int )((x).size())
#define pb push_back

#define REP(i,n) for (int i = 0; i<n; ++i)
#define REP1(i,n) for (int i = 1; i<=n; ++i)

#define MX(a,b) a = max(a,b)
#define MN(a,b) a = min(a,b)
map<pii, int> mp;

int getd(int a, int b){
    if (a==b) return 0;
    if (a>b) swap(a,b);
    if (!mp.count({a,b})) mp[{a,b}] = getDistance(a,b);
    return mp[{a,b}];
}

int hubDistance(int n, int sub) {
    int p1=0, p2=0;
    {
        int far = 0;
        REP(i,n) {
            if (i != 0) {
                if (getd(0,i) > far) {
                    far = getd(0,i);
                    p1 = i;
                }
            }
        }
    }
    vector<int> A(n);
    vector<int> B(n);
    {
        int far = 0;
        REP(i,n) {
            if (i!=p1) {
                A[i] = getd(p1, i);
                if (getd(p1,i) > far) {
                    far = getd(p1,i);
                    p2 = i;
                }
            }
        }
    }
    bug(p1, p2);
    ll R = 2000000000;
    ll dia = A[p2];
    REP(i,n) {
        B[i] = getd(p2,i);
        MN(R, (dia + abs(A[i] - B[i])) / 2);
    }
    bug(dia, R);

	return R;
}

Compilation message (stderr)

towns.cpp: In function 'int hubDistance(int, int)':
towns.cpp:74:9: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
   74 |  return R;
      |         ^
towns.cpp:38:28: warning: unused parameter 'sub' [-Wunused-parameter]
   38 | 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