Submission #31013

#	Time	Username	Problem	Language	Result	Execution time	Memory
31013		kajebiii	Towns (IOI15_towns)	C++14	25 / 100	33 ms	2072 KiB

towns

#include "towns.h"
#include <bits/stdc++.h>

using namespace std;

#define SZ(v) ((int)(v).size())
#define ALL(v) (v).begin(),(v).end()
#define one first
#define two second
typedef long long ll;
typedef unsigned long long ull;
typedef pair<double, double> pd;
typedef pair<int, int> pi;
typedef pair<ll, int> pli;
typedef pair<ll, ll> pll; typedef pair<ll, pi> plp;
typedef tuple<int, int, int> ti; typedef tuple<ll, int, int> tli;
const int INF = 0x3f2f1f0f;
const ll LINF = 1ll * INF * INF * 2;

map<pi, int> Mp;
int getD(int i, int j) {
    if(Mp.count(pi(i, j)) == 0) Mp[pi(i, j)] = Mp[pi(j, i)] = getDistance(i, j);
    return Mp[pi(i, j)];
}

int N, Sub;
int hubDistance(int n, int sub) {
    Mp.clear();
    N = n; Sub = sub;

    int max0D = -1, f = -1;
    for(int i=0; i<N; i++) {
        if(i == 0) continue;
        int d = getD(0, i);
        if(max0D < d) max0D = d, f = i;
    }
    int maxfD = -1, s = -1;
    for(int i=0; i<N; i++) {
        if(i == f) continue;
        int d = getD(f, i);
        if(maxfD < d) maxfD = d, s = i;
    }

    int R = INF;
    for(int i=0; i<N; i++) {
        int all = (getD(f, i) + getD(i, s) + getD(s, f) ) / 2;
        int fd = all - getD(i, s);
        int sd = all - getD(i, f);
        int id = all - getD(s, f);
//        printf("%d %d %d -> %d %d %d\n", f, s, i, fd, sd, id);
        R = min(R, max(fd, sd));
    }
    return R;
}

Compilation message (stderr)

towns.cpp: In function 'int hubDistance(int, int)':
towns.cpp:49:13: warning: unused variable 'id' [-Wunused-variable]
         int id = all - getD(s, f);
             ^

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