Submission #376279

#	Time	Username	Problem	Language	Result	Execution time	Memory
376279		errorgorn	Selotejp (COCI20_selotejp)	C++17	110 / 110	209 ms	81772 KiB

Main

//雪花飄飄北風嘯嘯
//天地一片蒼茫

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#include <ext/rope>
using namespace std;
using namespace __gnu_pbds;
using namespace __gnu_cxx;
#define ll long long
#define ii pair<ll,ll>
#define iii pair<ii,ll>
#define fi first
#define se second
#define endl '\n'
#define debug(x) cout << #x << " is " << x << endl

#define pub push_back
#define pob pop_back
#define puf push_front
#define pof pop_front
#define lb lower_bound
#define up upper_bound

#define rep(x,start,end) for(auto x=(start)-((start)>(end));x!=(end)-((start)>(end));((start)<(end)?x++:x--))
#define all(x) (x).begin(),(x).end()
#define sz(x) (int)(x).size()

#define indexed_set tree<ll,null_type,less<ll>,rb_tree_tag,tree_order_statistics_node_update>
//change less to less_equal for non distinct pbds, but erase will bug

mt19937 rng(chrono::system_clock::now().time_since_epoch().count());

int n,m;
string grid[1005];

int memo[1005][10][1024][2];

int dp(int p1,int p2,int mask,int prev){
	if (p2==m) return dp(p1+1,0,mask,0);
	if (p1==n) return 0;
	if (memo[p1][p2][mask][prev]!=-1) return memo[p1][p2][mask][prev];
	
	int ans;
	
	if (grid[p1][p2]=='.'){
		if (mask&(1<<p2)) mask^=(1<<p2); //remove hori line
		ans=dp(p1,p2+1,mask,0); //also no vert line
	}
	else{
		if (prev==1 && mask&(1<<p2)){
			ans=min(dp(p1,p2+1,mask^(1<<p2),prev),
					dp(p1,p2+1,mask,0));
		}
		else if (prev==1 || mask&(1<<p2)){
			ans=dp(p1,p2+1,mask,prev);
		}
		else{
			ans=min(dp(p1,p2+1,mask|(1<<p2),0)+1,
					dp(p1,p2+1,mask,1)+1);
		}
	}
	
	return memo[p1][p2][mask][prev]=ans;
}

int main(){
	ios::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	cin.exceptions(ios::badbit | ios::failbit);
	
	cin>>n>>m;
	rep(x,0,n) cin>>grid[x];
	
	memset(memo,-1,sizeof(memo));
	cout<<dp(0,0,0,0)<<endl;
}

• Subtask 1: 35 / 35
• Subtask 2: 35 / 35
• Subtask 3: 40 / 40