Submission #648010

#	Time	Username	Problem	Language	Result	Execution time	Memory
648010		ghostwriter	Ideal city (IOI12_city)	C++14	32 / 100	130 ms	896 KiB

city

#include <bits/stdc++.h>
using namespace std;
#ifdef LOCAL
#include <debug.h>
#include "grader.cpp"
#else
#define debug(...)
#endif
#define ft front
#define bk back
#define st first
#define nd second
#define ins insert
#define ers erase
#define pb push_back
#define pf push_front
#define _pb pop_back
#define _pf pop_front
#define lb lower_bound
#define ub upper_bound
#define mtp make_tuple
#define bg begin
#define ed end
#define all(x) (x).bg(), (x).ed()
#define sz(x) (int)(x).size()
typedef long long ll; typedef unsigned long long ull;
typedef double db; typedef long double ldb;
typedef pair<int, int> pi; typedef pair<ll, ll> pll;
typedef vector<int> vi; typedef vector<ll> vll; typedef vector<pi> vpi; typedef vector<pll> vpll;
typedef string str;
template<typename T> T gcd(T a, T b) { return (b == 0? a : gcd(b, a % b)); }
template<typename T> T lcm(T a, T b) { return a / gcd(a, b) * b; }
#define FOR(i, l, r) for (int (i) = (l); (i) <= (r); ++(i))
#define FOS(i, r, l) for (int (i) = (r); (i) >= (l); --(i))
#define FRN(i, n) for (int (i) = 0; (i) < (n); ++(i))
#define FSN(i, n) for (int (i) = (n) - 1; (i) >= 0; --(i))
#define EACH(i, x) for (auto &(i) : (x))
#define WHILE while
#define file "TEST"
mt19937 rd(chrono::steady_clock::now().time_since_epoch().count());
ll rand(ll l, ll r) { return uniform_int_distribution<ll>(l, r)(rd); }
/*
----------------------------------------------------------------
    END OF TEMPLATE
----------------------------------------------------------------
    Tran The Bao - ghostwriter
    Training for VOI23 gold medal
----------------------------------------------------------------
    DIT ME CHUYEN BAO LOC
----------------------------------------------------------------
*/
const int oo = 1e9 + 5;
const int M = 1e9;
namespace subtask12 {
    const int MAXN = 2e3;
    vi adj[MAXN];
    map<pi, int> d;
    vi bfs(int N, int source) {
        vi d(N, oo);
        queue<int> q;
        d[source] = 0;
        q.push(source);
        WHILE(!q.empty()) {
            int u = q.ft();
            q.pop();
            EACH(v, adj[u]) {
                if (d[v] != oo) continue;
                d[v] = d[u] + 1;
                q.push(v);
            }
        }
        return d;
    }
    int DistanceSum(int N, int *X, int *Y) {
        FRN(i, N) d[{X[i], Y[i]}] = i;
        FRN(i, N) {
            if (d.count({X[i] - 1, Y[i]})) {
                int pos = d[{X[i] - 1, Y[i]}];
                adj[i].pb(pos);
                adj[pos].pb(i);
            }
            if (d.count({X[i], Y[i] - 1})) {
                int pos = d[{X[i], Y[i] - 1}];
                adj[i].pb(pos);
                adj[pos].pb(i);
            }
        }
        int rs = 0;
        FRN(i, N) {
            vi d = bfs(N, i);
            FRN(j, i) (rs += d[j]) %= M;
        }
        return rs;
    }
}
namespace subtask3 {
    const int MAXN = 1e5 + 5;
    pi a[MAXN], f[MAXN];
    vi v;
    int getpos(int x) { return lb(all(v), x) - v.bg(); }
    void upd(int pos, pi v) { ++pos; for (int i = pos; i < MAXN; i += (i & -i)) { (f[i].st += v.st) %= M; (f[i].nd += v.nd) %= M; } }
    pi get(int pos) { ++pos; pi rs = {0, 0}; for (int i = pos; i > 0; i -= (i & -i)) { (rs.st += f[i].st) %= M; (rs.nd += f[i].nd) %= M; } return rs; }
    int DistanceSum(int N, int *X, int *Y) {
        FRN(i, N) {
            a[i] = {X[i], Y[i]};
            v.pb(Y[i]);
        }
        sort(all(v));
        sort(a, a + N);
        int rs = 0, sumx = 0, sumy = 0;
        FRN(i, N) {
            int x = X[i], y = Y[i];
            int pos = getpos(a[i].nd);
            pi tmp = get(pos);
            int cnt = tmp.st, sumy1 = tmp.nd;
            rs = (rs + 1LL * x * i % M - sumx + M) % M;
            rs = (rs + 1LL * y * cnt % M - sumy1 + M) % M;
            rs = (rs + 1LL * y * (i - cnt) % M - sumy + sumy1 + M) % M;
        }
        return rs;
    }
}
int DistanceSum(int N, int *X, int *Y) {
    if (N <= 2000) return subtask12::DistanceSum(N, X, Y);
    return subtask3::DistanceSum(N, X, Y);
}
/*
11
2 5
2 6
3 3
3 6
4 3
4 4
4 5
4 6
5 3
5 4
5 6
----------------------------------------------------------------
From Benq:
    stuff you should look for
        * int overflow, array bounds
        * special cases (n=1?)
        * do smth instead of nothing and stay organized
        * WRITE STUFF DOWN
        * DON'T GET STUCK ON ONE APPROACH
----------------------------------------------------------------
*/

Compilation message (stderr)

city.cpp: In function 'vi subtask12::bfs(int, int)':
city.cpp:37:31: warning: unnecessary parentheses in declaration of 'v' [-Wparentheses]
   37 | #define EACH(i, x) for (auto &(i) : (x))
      |                               ^
city.cpp:66:13: note: in expansion of macro 'EACH'
   66 |             EACH(v, adj[u]) {
      |             ^~~~
city.cpp: In function 'int subtask12::DistanceSum(int, int*, int*)':
city.cpp:35:28: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
   35 | #define FRN(i, n) for (int (i) = 0; (i) < (n); ++(i))
      |                            ^
city.cpp:75:9: note: in expansion of macro 'FRN'
   75 |         FRN(i, N) d[{X[i], Y[i]}] = i;
      |         ^~~
city.cpp:35:28: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
   35 | #define FRN(i, n) for (int (i) = 0; (i) < (n); ++(i))
      |                            ^
city.cpp:76:9: note: in expansion of macro 'FRN'
   76 |         FRN(i, N) {
      |         ^~~
city.cpp:35:28: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
   35 | #define FRN(i, n) for (int (i) = 0; (i) < (n); ++(i))
      |                            ^
city.cpp:89:9: note: in expansion of macro 'FRN'
   89 |         FRN(i, N) {
      |         ^~~
city.cpp:35:28: warning: unnecessary parentheses in declaration of 'j' [-Wparentheses]
   35 | #define FRN(i, n) for (int (i) = 0; (i) < (n); ++(i))
      |                            ^
city.cpp:91:13: note: in expansion of macro 'FRN'
   91 |             FRN(j, i) (rs += d[j]) %= M;
      |             ^~~
city.cpp: In function 'int subtask3::DistanceSum(int, int*, int*)':
city.cpp:35:28: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
   35 | #define FRN(i, n) for (int (i) = 0; (i) < (n); ++(i))
      |                            ^
city.cpp:104:9: note: in expansion of macro 'FRN'
  104 |         FRN(i, N) {
      |         ^~~
city.cpp:35:28: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
   35 | #define FRN(i, n) for (int (i) = 0; (i) < (n); ++(i))
      |                            ^
city.cpp:111:9: note: in expansion of macro 'FRN'
  111 |         FRN(i, N) {
      |         ^~~

• Subtask 1: 11 / 11
• Subtask 2: 21 / 21
• Subtask 3: 0 / 23
• Subtask 4: 0 / 45