Submission #388259

#	Time	Username	Problem	Language	Result	Execution time	Memory
388259		ACmachine	Towns (IOI15_towns)	C++17	13 / 100	21 ms	952 KiB

towns

#include "towns.h"
#include <bits/stdc++.h>
using namespace std;
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;

template<typename T> using ordered_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
template<typename T, typename U> using ordered_map = tree<T, U, less<T>, rb_tree_tag, tree_order_statistics_node_update>;

typedef long long ll;
typedef long double ld;

typedef pair<int,int> pii;
typedef pair<ll,ll> pll;

typedef vector<int> vi;
typedef vector<ll> vll;

#define FOR(i,j,k,in) for(int i=(j); i < (k);i+=in)
#define FORD(i,j,k,in) for(int i=(j); i >=(k);i-=in)
#define REP(i,b) FOR(i,0,b,1)
#define REPD(i,b) FORD(i,b,0,1)
#define pb push_back
#define mp make_pair
#define ff first
#define ss second
#define all(x) begin(x), end(x)
#define MANY_TESTS int tcase; cin >> tcase; while(tcase--)

const double EPS = 1e-9;
const int MOD = 1e9+7;
const ll INFF = 1e18;
const int INF = 1e9;
const ld PI = acos((ld)-1);
const vi dy = {1, 0, -1, 0, -1, 1, 1, -1};
const vi dx = {0, 1, 0, -1, -1, 1, -1, 1};

void DBG(){cout << "]" << endl;}
template<typename T, typename ...U> void DBG(const T& head, const U... args){ cout << head << "; "; DBG(args...); }
#define dbg(...) cout << "Line(" << __LINE__ << ") -> [" << #__VA_ARGS__ << "]: [", DBG(__VA_ARGS__);
#define chk() cout << "Check at line(" << __LINE__ << ") hit." << endl;

template<class T, unsigned int U>
ostream& operator<<(ostream& out, const array<T, U> &v){out << "[";  REP(i, U) out << v[i] << ", ";  out << "]"; return out;}
template <class T, class U>
ostream& operator<<(ostream& out, const pair<T, U> &par) {out << "[" << par.first << ";" << par.second << "]"; return out;}
template <class T>
ostream& operator<<(ostream& out, const set<T> &cont) { out << "{"; for( const auto &x:cont) out << x << ", "; out << "}"; return out; }
template <class T, class U>
ostream& operator<<(ostream& out, const map<T, U> &cont) {out << "{"; for( const auto &x:cont) out << x << ", "; out << "}"; return out; }
template<class T>
ostream& operator<<(ostream& out, const vector<T> &v){ out << "[";  REP(i, v.size()) out << v[i] << ", ";  out << "]"; return out;}

template<class T>
istream& operator>>(istream& in, vector<T> &v){ for(auto &x : v) in >> x; return in; }

int hubDistance(int n, int sub) {
    auto solve_sub1 = [&](){
        vector<vector<int>> dist(n, vector<int>(n));
        REP(i, n){
            REP(j, i){
                dist[i][j] = dist[j][i] = getDistance(i, j);
            }
        }
        int f, s;
        int maxi = -1;
        REP(i, n){
            REP(j, i){
                if(dist[i][j] > maxi){
                    maxi = dist[i][j];
                    f = i; s = j;
                }
            }
        }
        auto solve_system = [](int a, int b, int c){
            // x1 + x2 = a;
            // x2 + x3 = b;
            // x1 + x3 = c;
            int x1 = (a + c - b) / 2;
            int x2 = (c + b - a) / 2;
            int x3 = (b + a - c) / 2;
            return make_tuple(x1, x2, x3);
        };
        int ans = INF;
        REP(i, n){
            if(i == f || i == s) continue;
            // df + ds = a;
            // ds + di = b;
            // df + di = c
            tuple<int, int, int> res = solve_system(dist[f][s], dist[s][i], dist[f][i]);
            int temp = max({get<0>(res), get<1>(res), get<2>(res)});
            ans = min(ans, temp);
        }
        return ans;
    };
	if(sub == 1)
	    return solve_sub1();
    else
        return 0;
}

Compilation message (stderr)

towns.cpp: In function 'int hubDistance(int, int)':
towns.cpp:87:28: warning: 's' may be used uninitialized in this function [-Wmaybe-uninitialized]
   87 |             if(i == f || i == s) continue;
      |                          ~~^~~~
towns.cpp:87:18: warning: 'f' may be used uninitialized in this function [-Wmaybe-uninitialized]
   87 |             if(i == f || i == s) continue;
      |                ~~^~~~

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