結果
| 問題 |
No.2251 Marking Grid
|
| コンテスト | |
| ユーザー |
|
| 提出日時 | 2023-03-13 19:31:30 |
| 言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
AC
|
| 実行時間 | 809 ms / 3,000 ms |
| コード長 | 3,095 bytes |
| コンパイル時間 | 3,051 ms |
| コンパイル使用メモリ | 214,456 KB |
| 最終ジャッジ日時 | 2025-02-11 10:59:12 |
|
ジャッジサーバーID (参考情報) |
judge1 / judge2 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 2 |
| other | AC * 40 |
ソースコード
#include <bits/stdc++.h>
// #include <atcoder/modint>
#define rng(a) a.begin(),a.end()
#define rrng(a) a.rbegin(),a.rend()
#define INF 2000000000000000000
#define ll long long
#define ull unsigned long long
#define ld long double
#define pll pair<ll, ll>
using namespace std;
template<class T>bool chmax(T &a, const T &b) { if (a<b) { a=b; return 1; } return 0; }
template<class T>bool chmin(T &a, const T &b) { if (b<a) { a=b; return 1; } return 0; }
const double PI = 3.141592653589793;
// ============union_find_tree===============
struct union_find {
vector<ll> par;
vector<ll> tree_rank;
vector<ll> num;
union_find(ll n)
{
par = vector<ll>(n);
num = vector<ll>(n, 1);
tree_rank = vector<ll>(n);
for (ll i = 0; i < n; ++i)
{
par.at(i) = i;
tree_rank.at(i) = 0;
}
}
ll find(ll x)
{
if (par.at(x) == x)
{
return x;
}
else
{
return par.at(x) = find(par.at(x));
}
}
ll get_num(ll x) {
return num.at(find(x));
}
void unite(ll x, ll y)
{
x = find(x);
y = find(y);
if (x == y)
{
return;
}
if (tree_rank.at(x) < tree_rank.at(y))
{
par.at(x) = y;
num.at(y) = num.at(x) + num.at(y);
}
else
{
par.at(y) = x;
num.at(x) = num.at(x) + num.at(y);
if (tree_rank.at(x) == tree_rank.at(y))
{
tree_rank.at(x)++;
}
}
}
bool same(ll x, ll y)
{
return find(x) == find(y);
}
};
// =======================================
ll mod = 998244353;
//=============modinv============================
ll modinv(ll a, ll m = mod) {
ll b = m, u = 1, v = 0;
while (b) {
ll t = a / b;
a -= t * b; swap(a, b);
u -= t * v; swap(u, v);
}
u %= m;
if (u < 0) u += m;
return u;
}
//=================================================
int main() {
ios::sync_with_stdio(false);
cin.tie(nullptr);
ll H, W;
cin >> H >> W;
vector<ll> power(H + W + 1, 1);
for (ll i = 0; i < H + W; ++i) {
power.at(i + 1) = power.at(i) * 2 % mod;
}
vector<vector<ll>> A(H, vector<ll>(W));
vector<vector<ll>> num;
for (ll i = 0; i < H; ++i) {
for (ll j = 0; j < W; ++j) {
cin >> A.at(i).at(j);
num.push_back({A.at(i).at(j), i, j});
}
}
sort(rrng(num));
ll r_num = W, c_num = H;
vector<bool> row(W, false);
vector<bool> col(H, false);
ll ans = 0;
vector<vector<ll>> already(H);
union_find uf(W);
for (ll i = 0; i < num.size(); ++i) {
vector<ll> n = num.at(i);
ll h = n.at(1), w = n.at(2);
if (already.at(h).size() != 0) {
ll nw = already.at(h).at((ll)already.at(h).size() - 1);
if (!uf.same(w, nw)) {
r_num -= 1;
}
else {
continue;
}
uf.unite(w, nw);
}
already.at(h).push_back(w);
if (!col.at(h)) {
col.at(h) = true;
c_num -= 1;
}
ans += (n.at(0) * power.at(r_num) % mod) * power.at(c_num) % mod;
ans %= mod;
}
ans *= modinv(2);
ans %= mod;
cout << ans << "\n";
}
//0011
//1100
//1100
//0011
//0101
//1010
//1010
//0101