oj.uz

Submission #257054

# Submission time Handle Problem Language Result Execution time Memory
257054 2020-08-03T15:00:28 Z eohomegrownapps Towns (IOI15_towns) C++14
25 / 100
 23 ms 624 KB 
#include "towns.h"
#include <bits/stdc++.h>
using namespace std;

vector<vector<int>> distv;
int n;

int dist(int a, int b){
    if (a==b){return 0;}
    if (a>b){
        swap(a,b);
    }
    if (distv[a][b]!=-1){
        return distv[a][b];
    } else {
        return distv[a][b]=getDistance(a,b);
    }
}

int hubDistance(int N, int sub) {
    n=N;
    distv.assign(n,vector<int>(n,-1));
	
    int adist = -1;
    int aind = -1;
    for (int i = 0; i<n; i++){
        int ds = dist(0,i);
        if (adist<ds){
            adist=ds;
            aind=i;
        }
    }


    int bdist = -1;
    int bind = -1;
    for (int i = 0; i<n; i++){
        int ds = dist(aind,i);
        if (bdist<ds){
            bdist=ds;
            bind=i;
        }
    }

    //from adist to aind
    //vector<int> diameter;
    int hubdist = 1e9;
    int hubind = -1;
    for (int i = 0; i<n; i++){
        if (i==aind||i==bind){continue;}
        int distfroma = dist(aind,i)-(dist(aind,i)+dist(bind,i)-dist(aind,bind))/2;
        int rv = max(distfroma,dist(aind,bind)-distfroma);
        if (rv<hubdist){
            hubdist=rv;
            hubind=i;
        }
    }
	return -hubdist;
}

Compilation message

towns.cpp: In function 'int hubDistance(int, int)':
towns.cpp:48:9: warning: variable 'hubind' set but not used [-Wunused-but-set-variable]
     int hubind = -1;
         ^~~~~~
towns.cpp:20:28: warning: unused parameter 'sub' [-Wunused-parameter]
 int hubDistance(int N, int sub) {
                            ^~~

Subtask #1
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 19 ms 512 KB Output is correct
2 Correct 16 ms 384 KB Output is correct
3 Correct 1 ms 256 KB Output is correct
4 Correct 23 ms 384 KB Output is correct
5 Correct 21 ms 384 KB Output is correct

Subtask #2
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 19 ms 384 KB Output is correct
2 Correct 17 ms 384 KB Output is correct
3 Correct 21 ms 460 KB Output is correct
4 Correct 21 ms 384 KB Output is correct

Subtask #3
0 / 13.0

# Verdict Execution time Memory Grader output
1 Incorrect 15 ms 384 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 22 ms 384 KB Output isn't correct

Subtask #5
0 / 13.0

# Verdict Execution time Memory Grader output
1 Incorrect 20 ms 624 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #6
0 / 39.0

# Verdict Execution time Memory Grader output
1 Incorrect 16 ms 384 KB Output isn't correct
2 Halted 0 ms 0 KB -