Submission #409831

#	Time	Username	Problem	Language	Result	Execution time	Memory
409831		definitelynotmee	Towns (IOI15_towns)	C++98	0 / 100	27 ms	844 KiB

towns

#include <bits/stdc++.h>
#include "towns.h"
#define mp make_pair
#define mt make_tuple
#define ff first
#define ss second
using namespace std;
typedef long long ll;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;
const ll INFL = (1LL<<62)-1;
const int INF = (1<<30)-1;
const int MAXN = 0;

int getDistance(int i, int j);

int hubDistance(int n, int sub){

    vector<int> ds (n,0), db(n,0), da(n,-1);

    int a, b;
    int maxi = -1;
    for(int i = 1; i < n; i++){
        ds[i] = getDistance(0,i);
        if(ds[i] > maxi)
            maxi = ds[i], b = i;
    }
    maxi = -1;
    db[0] = ds[b];
    for(int i = 1; i < n; i++){
        if(i==b)
            continue;
        db[i] = getDistance(b,i);
        if(db[i] > maxi)
            maxi = db[i], a = i;
    }
    da[a] = 0;
    da[b] = db[a];
    vector<int> dlca(n,0);
    for(int i = 0; i < n; i++){
        dlca[i] = (db[0] + db[i] - ds[i])>>1;
    }

    int resp = INF;
    for(int i = 0; i < n; i++){
        resp = min(resp, max(dlca[i], db[a] - dlca[i]));
    }
        
    return resp;
}

Compilation message (stderr)

towns.cpp: In function 'int hubDistance(int, int)':
towns.cpp:17:28: warning: unused parameter 'sub' [-Wunused-parameter]
   17 | int hubDistance(int n, int sub){
      |                        ~~~~^~~
towns.cpp:29:17: warning: 'b' may be used uninitialized in this function [-Wmaybe-uninitialized]
   29 |     db[0] = ds[b];
      |                 ^
towns.cpp:37:9: warning: 'a' may be used uninitialized in this function [-Wmaybe-uninitialized]
   37 |     da[a] = 0;
      |         ^

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