結果
| 問題 |
No.3060 Erase Binary Matrix
|
| コンテスト | |
| ユーザー |
沙耶花
|
| 提出日時 | 2025-03-14 23:11:39 |
| 言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
AC
|
| 実行時間 | 96 ms / 2,000 ms |
| コード長 | 3,773 bytes |
| コンパイル時間 | 5,755 ms |
| コンパイル使用メモリ | 264,320 KB |
| 実行使用メモリ | 7,328 KB |
| 最終ジャッジ日時 | 2025-03-14 23:12:10 |
| 合計ジャッジ時間 | 8,239 ms |
|
ジャッジサーバーID (参考情報) |
judge1 / judge3 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 2 |
| other | AC * 49 |
ソースコード
#include <stdio.h>
#include <bits/stdc++.h>
#include <atcoder/all>
using namespace atcoder;
using mint = modint998244353;
using namespace std;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf32 1000000000
#define Inf64 1000000000000000001LL
template <class S>
struct potentialized_dsu {
public:
potentialized_dsu() : _n(0) {}
potentialized_dsu(int n) : _n(n), parent_or_size(n, -1), d(n) {}
int merge(int a, int b, S v) {
assert(0 <= a && a < _n);
assert(0 <= b && b < _n);
int x = leader(a), y = leader(b);
if (x == y) return x;
if (-parent_or_size[x] < -parent_or_size[y]){
std::swap(x, y);
std::swap(a, b);
S t;
v = t - v;
}
v += diff(x,a);
v -= diff(y,b);
d[y] += d[x] + v;
parent_or_size[x] += parent_or_size[y];
parent_or_size[y] = x;
return x;
}
bool same(int a, int b) {
assert(0 <= a && a < _n);
assert(0 <= b && b < _n);
return leader(a) == leader(b);
}
int leader(int a) {
assert(0 <= a && a < _n);
if (parent_or_size[a] < 0) return a;
int l = leader(parent_or_size[a]);
if(parent_or_size[a] != l){
d[a] += d[parent_or_size[a]];
parent_or_size[a] = l;
}
return parent_or_size[a];
}
int size(int a) {
assert(0 <= a && a < _n);
return -parent_or_size[leader(a)];
}
S diff(int a,int b){
assert(0 <= a && a < _n);
assert(0 <= b && b < _n);
leader(a);
leader(b);
return d[b] - d[a];
}
std::vector<std::vector<int>> groups() {
std::vector<int> leader_buf(_n), group_size(_n);
for (int i = 0; i < _n; i++) {
leader_buf[i] = leader(i);
group_size[leader_buf[i]]++;
}
std::vector<std::vector<int>> result(_n);
for (int i = 0; i < _n; i++) {
result[i].reserve(group_size[i]);
}
for (int i = 0; i < _n; i++) {
result[leader_buf[i]].push_back(i);
}
result.erase(
std::remove_if(result.begin(), result.end(),
[&](const std::vector<int>& v) { return v.empty(); }),
result.end());
return result;
}
private:
int _n;
// root node: -1 * component size
// otherwise: parent
std::vector<int> parent_or_size;
std::vector<S> d;
};
struct xorint{
using mytype = xorint;
int v = 0;
mytype operator+(mytype another)const{
return (mytype(*this)+=another);
}
mytype &operator+=(const mytype &another){
(*this).v ^= another.v;
return (*this);
}
mytype operator-(mytype another)const{
return (mytype(*this)-=another);
}
mytype &operator-=(const mytype &another){
(*this).v ^= another.v;
return (*this);
}
};
int main(){
int h,w;
cin>>h>>w;
vector<string> s(h);
rep(i,h)cin>>s[i];
sort(s.begin(),s.end(),[&](string a,string b){
int x = 0,y = 0;
rep(i,w){
if(a[i]=='1')x++;
if(b[i]=='1')y++;
}
if(x!=y)return x<y;
return a<b;
});
scc_graph S(h);
vector<int> u,v;
rep(i,h){
for(int j=i+1;j<h;j++){
if(s[i]==s[j]){
S.add_edge(i,j);
S.add_edge(j,i);
}
else{
bool f = true;
rep(k,w){
if(s[i][k]=='1' && s[j][k]=='0')f = false;
}
if(f){
S.add_edge(i,j);
u.push_back(i);
v.push_back(j);
}
}
}
}
auto ss = S.scc();
vector<int> pos(h);
rep(i,ss.size()){
for(auto j:ss[i]){
pos[j] = i;
}
}
vector<vector<int>> E(ss.size());
rep(i,u.size()){
E[pos[u[i]]].push_back(pos[v[i]]);
}
vector<int> dp(ss.size(),0);
rep(i,ss.size()){
dp[i] += ss[i].size();
rep(j,E[i].size()){
dp[E[i][j]] = max(dp[E[i][j]],dp[i]);
}
}
int ans = 0;
rep(i,ss.size()){
ans = max(ans,dp[i]);
}
cout<<h-ans<<endl;
return 0;
}
沙耶花