Submission #388184

#	Time	Username	Problem	Language	Result	Execution time	Memory
388184		BorisBarca	Skandi (COCI20_skandi)	C++14	55 / 110	754 ms	34824 KiB

Main

/*
$$$$$$$\                      $$\           $$$$$$$\
$$  __$$\                     \__|          $$  __$$\
$$ |  $$ | $$$$$$\   $$$$$$\  $$\  $$$$$$$\ $$ |  $$ | $$$$$$\   $$$$$$\   $$$$$$$\ $$$$$$\
$$$$$$$\ |$$  __$$\ $$  __$$\ $$ |$$  _____|$$$$$$$\ | \____$$\ $$  __$$\ $$  _____|\____$$\
$$  __$$\ $$ /  $$ |$$ |  \__|$$ |\$$$$$$\  $$  __$$\  $$$$$$$ |$$ |  \__|$$ /      $$$$$$$ |
$$ |  $$ |$$ |  $$ |$$ |      $$ | \____$$\ $$ |  $$ |$$  __$$ |$$ |      $$ |     $$  __$$ |
$$$$$$$  |\$$$$$$  |$$ |      $$ |$$$$$$$  |$$$$$$$  |\$$$$$$$ |$$ |      \$$$$$$$\\$$$$$$$ |
\_______/  \______/ \__|      \__|\_______/ \_______/  \_______|\__|       \_______|\_______|
*/
#include <bits/stdc++.h>

using namespace std;

#define PB push_back
#define MP make_pair
#define INS insert
#define LB lower_bound
#define UB upper_bound
#define pii pair <int,int>
#define pll pair <long long, long long>
#define X first
#define Y second
#define _ << " " <<
#define sz(x) (int)x.size()
#define all(a) (a).begin(),(a).end()
#define FOR(i, a, b) for (int i = (a); i < (b); ++i)
#define FORD(i, a, b) for (int i = (a); i > (b); --i)
#define FORA(i, x) for (auto &i : x)
#define REP(i, n) FOR(i, 0, n)
#define BITS(x) __builtin_popcount(x)
#define SQ(a) (a) * (a)
#define TRACE(x) cout << #x " = " << (x) << '\n';
#define YES cout << "YES\n"
#define NO cout << "NO\n"
#define umap unordered_map

typedef long long ll;
typedef long double ld;
typedef vector <int> vi;
typedef vector <pii> vpi;
typedef vector <ll> vll;
typedef vector <pll> vpl;
typedef vector <double> vd;
typedef vector <ld> vld;
typedef vector<string> vs;
//((float) t)/CLOCKS_PER_SEC

const int MOD = 1e9 + 2015;
const double PI = acos(-1);
const int INF = 1e9 + 10;
const ll INFL = 1e18 + 10;
const int ABC = 30;
const int dx[] = {-1, 1, 0, 0};
const int dy[] = {0, 0, -1, 1};
const int dox[] = {-1, 1, 0, 0, -1, -1, 1, 1};
const int doy[] = {0, 0, -1, 1, -1, 1, -1, 1};

inline int sum(int a, int b){
	if (a + b < 0)
		return (a + b + MOD) % MOD;
	return (a + b) % MOD;
}

inline void add(int &a, int b){
	a = sum(a, b);
}

inline int mul(int a, int b){
	return (ll)a * (ll)b % MOD;
}

inline int sub(int a, int b){
	return (a - b + MOD) % MOD;
}

inline int fast_pot(ll pot, ll n){
	ll ret = 1;
	while (n){
		if (n & 1LL)
			ret = (ret * pot) % MOD;
		pot = (pot * pot) % MOD;
		n >>= 1LL;
	}
	return ret;
}

inline int divide(int a, int b){
	return mul(a, fast_pot(b, MOD - 2));
}

ll lcm(ll a, ll b){
	return abs(a * b) / __gcd(a, b);
}

inline double ccw(pii A, pii B, pii C){
	return (A.X * B.Y) - (A.Y * B.X) + (B.X * C.Y) - (B.Y * C.X) + (C.X * A.Y) - (C.Y * A.X);
}

inline int CCW(pii A, pii B, pii C){
	double val = ccw(A, B, C);
	double eps = max(max(abs(A.X), abs(A.Y)), max(max(abs(B.X), abs(B.Y)), max(abs(C.X), abs(C.Y)))) / 1e9;
	if (val <= -eps)
		return -1;
	if (val >= eps)
		return 1;
	return 0;
}

void to_upper(string &x){
	REP(i, sz(x))
		x[i] = toupper(x[i]);
}

void to_lower(string &x){
	REP(i, sz(x))
		x[i] = tolower(x[i]);
}

string its(ll x){
	if (x == 0)
		return "0";
	string ret = "";
	while (x > 0){
		ret += (x % 10) + '0';
		x /= 10;
	}
	reverse(all(ret));
	return ret;
}

ll sti(string s){
	ll ret = 0;
	REP(i, sz(s)){
		ret *= 10;
		ret += (s[i] - '0');
	}
	return ret;
}

const int N = 505;
const int NIL = 0;

int n, m, idx[N][N], h[N][N], v[N][N], cnt, pair_u[3 * N * N], pair_v[3 * N * N], dist[3 * N * N];
string mat[N];
umap <int, umap <int, int>> e;

bool bfs(){
	queue <int> q;
	FOR(u, 1, cnt){
		if (pair_u[u] == NIL){
			dist[u] = 0;
			q.push(u);
		} else 
			dist[u] = INF;
	}
	dist[NIL] = INF;
	while (sz(q)){
		int u = q.front(); q.pop();
		if (dist[u] < dist[NIL]){
			FORA(v, e[u]){
				if (dist[pair_v[v.X]] == INF){
					dist[pair_v[v.X]] = dist[u] + 1;
					q.push(pair_v[v.X]);
				}
			}
		}
	}
	return (dist[NIL] != INF);
}

bool dfs(int u){
	if (u != NIL){
		FORA(v, e[u]){
			if (dist[pair_v[v.X]] == dist[u] + 1){
				if (dfs(pair_v[v.X])){
					pair_u[u] = v.X;
					pair_v[v.X] = u;
					return true;
				}
			}
		}
		dist[u] = INF;
		return false;
	}
	return true;
}

int hopcroft_karp(){
	FOR(u, 1, cnt)
		pair_u[u] = NIL;
	FOR(v, cnt, 2 * cnt + 1)
		pair_v[v] = NIL;
	int ret = 0;
	while (bfs()){
		FOR(u, 1, cnt){
			if (pair_u[u] == NIL){
				if (dfs(u))
					ret++;
			}
		}
	}
	return ret;
}

int main () {
	ios_base::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);

	cin >> n >> m;
	REP(i, n)
		cin >> mat[i];

	cnt = 1;
	REP(i, n)
		REP(j, m)
			if (mat[i][j] == '1')
				idx[i][j] = cnt++;

	REP(i, n){
		int tmp = 0;
		REP(j, m){
			if (mat[i][j] == '1'){
				tmp = idx[i][j];
			}
			h[i][j] = tmp;
		}
	}

	REP(j, m){
		int tmp = 0;
		REP(i, n){
			if (mat[i][j] == '1'){
				tmp = idx[i][j];
			}
			v[i][j] = tmp + cnt;
		}
	}

	REP(i, n){
		REP(j, m){
			if (mat[i][j] == '0'){
				e[h[i][j]][v[i][j]] = 1;
				e[v[i][j]][h[i][j]] = 1;
			}
		}
	}

	cout << hopcroft_karp() << '\n';
	
	return 0;
}

• Subtask 1: 9 / 18
• Subtask 2: 16 / 32
• Subtask 3: 30 / 60