Submission #338191

#	Time	Username	Problem	Language	Result	Execution time	Memory
338191		amunduzbaev	K-th path (IZhO11_kthpath)	C++14	100 / 100	2 ms	364 KiB

kthpath

/** made by amunduzbaev **/
#include <bits/stdc++.h>
using namespace std;
#define ff first
#define ss second
#define pb push_back
#define mp make_pair
#define ub upper_bound
#define lb lower_bound
#define ll long long 
#define ld long double 
#define pii pair<int, int>
#define pll pair<ll, ll>
#define sz(x) (int)x.size()
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(),x.rend()
#define fastios ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define vll vector<ll>
#define vii vector<int>
#define vpii vector<pii>
#define vpll vector<pll>
const int N = 35;
const int mod = 1e9+7;
const ll inf = 1e18;
const ld Pi = acos(-1);
ll n, m, k, dp[N][N];
string ans;
char a[N][N];

ll check(int i, int j){
	if(i == n-1 && j == m-1) return 1;
	int cur = i+j;
	if(ans[cur] != '*' && ans[cur] != a[i][j]) return 0;
	ll &r = dp[i][j];
	if(r != -1) return r;
	r = 0;
	if(i+1 < n) r += check(i+1, j);
	if(j+1 < m) r += check(i, j+1);
	return r;
}

void solve(){
	fastios 
	cin>>n>>m;
	for(int i=0;i<n;i++){
		for(int j=0;j<m;j++) cin>>a[i][j];
	}
	
	cin>>k;
	ans.resize(n+m-1, '*');
	for(int i=0;i<n+m-1;i++){
		for(int j=0;j<26;j++){
			memset(dp, -1, sizeof(dp));
			ans[i] = 'a'+j;
			ll ch = check(0, 0);
			if(ch >= k) break;
			k-=ch;
		}
	}
	ans[n+m-2] = a[n-1][m-1];
	cout<<ans<<"\n";
	return;
}

int main(){
	fastios
	int t = 1;
	if(t) solve();
	else {
		cin>>t;
		while (t--) solve();
	}
	return 0;
}

• Subtask 1: 100 / 100