Submission #126907

#	Time	Username	Problem	Language	Result	Execution time	Memory
126907		RockyB	Coin Collecting (JOI19_ho_t4)	C++17	0 / 100	2 ms	376 KiB

joi2019_ho_t4

/// In The Name Of God

//#pragma GCC optimize("Ofast")
//#pragma GCC target("sse,sse2,sse3,ssse3,sse4")
//#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,avx2,tune=native")
//#pragma GCC optimize("unroll-loops")

#include <bits/stdc++.h>

#define f first
#define s second

#define pb push_back
#define pp pop_back
#define mp make_pair

#define sz(x) (int)x.size()
#define sqr(x) ((x) * 1ll * (x))
#define all(x) x.begin(), x.end()

#define rep(i, l, r) for (int i = (l); i <= (r); i++)
#define per(i, l, r) for (int i = (l); i >= (r); i--)

#define Kazakhstan ios_base :: sync_with_stdio(0), cin.tie(0), cout.tie(0);

#define nl '\n'
#define ioi exit(0);

typedef long long ll;
typedef long double ld;
typedef unsigned long long ull;

const int N = (int)2e5 + 7;
const int inf = (int)1e9 + 7;
const int mod = (int)1e9 + 7;
const ll linf = (ll)1e18 + 7;

const int dx[] = {-1, 0, 1, 0, 1, -1, -1, 1};
const int dy[] = {0, 1, 0, -1, 1, -1, 1, -1};

using namespace std;

int n;
pair <ll, ll> a[N];
bool was[N];


int take(ll x, ll y) {
  ll mn = linf;
  int ans = 0;
  ll ox, oy;
  rep(i, 1, n << 1) {
    if (!was[i]) {
      ll dist = abs(x - a[i].f) + abs(y - a[i].s);
      if (mn > dist) {
        mn = dist;
        ans = i;
        ox = a[i].f, oy = a[i].s;
      }
      else if (mn == dist) {
        if (a[i].f < ox || (a[i].f == ox && (a[i].s < oy))) {
          ox = a[i].f, oy = a[i].s;
          ans = i;
        }
      }
    }
  } 
  return ans;
}

bool check(int x, int y) {
  return 1 <= x && x <= n && 1 <= y && y <= 2;
}
int main() {
	#ifdef IOI
		freopen ("in.txt", "r", stdin);
	#endif
  Kazakhstan
  cin >> n;
  rep(i, 1, n << 1) {
    cin >> a[i].f >> a[i].s;
  }

  map < pair <int, int>, int> placed;
  rep(i, 1, n << 1) {
    if (check(a[i].f, a[i].s)) {
      if (placed.count(a[i])) continue;
      placed[a[i]] = 1;
      was[i] = 1;
    }
  }

  ll ans = 0;
  rep(j, 1, 2) {
    rep(i, 1, n) {
      if (placed.count({i, j})) continue;

      int id = take(i, j);
      was[id] = 1;
      ans += abs(i - a[id].f) + abs(j - a[id].s);
      //cerr << i << ' ' << j << ' ' << id << endl;
    }
  }
  cout << ans;
	ioi
}

Compilation message (stderr)

joi2019_ho_t4.cpp: In function 'int take(ll, ll)':
joi2019_ho_t4.cpp:61:42: warning: 'oy' may be used uninitialized in this function [-Wmaybe-uninitialized]
         if (a[i].f < ox || (a[i].f == ox && (a[i].s < oy))) {
                            ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~
joi2019_ho_t4.cpp:61:25: warning: 'ox' may be used uninitialized in this function [-Wmaybe-uninitialized]
         if (a[i].f < ox || (a[i].f == ox && (a[i].s < oy))) {
             ~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 8
• Subtask 2: 0 / 29
• Subtask 3: 0 / 63