Submission #235247

#	Time	Username	Problem	Language	Result	Execution time	Memory
235247		Nodir_Bobiev	Lamps (JOI19_lamps)	C++17	0 / 100	1095 ms	92284 KiB

lamp

/*
+----------------------------------------------------------------+
| In the name of Allah, the most Gracious and the most Merciful. |
+----------------------------------------------------------------+
Our hearts quake with fear of you
Our hearts wake with love for you
And to Islam we must be true
In everything we think and do.
--------------------------------
When your heart is breaking
And your pain makes you fall
Remember just remember
Allah Sees it all.
*/
# include <bits/stdc++.h>
# define FILE
using namespace std;

const int N = 1e6 + 100;
const int inf = 9;
string A,B;
int n;
vector < vector < int > > dp[N];
vector < vector < int > > oper= { {}, {1}, {2}, {3}, {1,1}, 
                                  {1,2}, {1,3}, {2,1}, {2,2}, 
                                  {2,3}, {3,1}, {3,2}, {3,3}, 
                                  {1,2,3}, {1,3,2}, {2,1,3},
                                  {2,3,1}, {3,1,2}, {3,2,1}
                                };  
char op(int x, char c){
    if( x == 0 ) return c;
    if( x == 1 ) return '0';
    if( x == 2 ) return '1';
    if( c == '1' ) return '0';
    return '1';
}
int get( vector < int >&v1, vector < int >&v2, int i=0, int j=0 ){
    if( i == (int)v1.size() || j == (int)v2.size()-1)return 0;
    int mx = 0;
    if( v1[i] == v2[j] ) mx = get(v1, v2, i+1, j+1) + 1;
    mx = max({mx, get(v1, v2, i+1, j), get(v1, v2, i, j+1)});
    return mx;
}

int main(){
    # ifdef FILEs
        freopen( "input.txt", "r", stdin );
        freopen( "output.txt", "w", stdout );
    # endif
    ios_base::sync_with_stdio(false);
    cin >> n >> A >> B;
    A = '0' + A;
    B = '0' + B;

    dp[0].push_back({0});

    for( int i = 1; i <= n; i ++ ){
        for( auto &v1: oper ){
            for( auto c: v1 )
                A[i] = op(c, A[i]);
            if( A[i] != B[i] )
                continue;
            int res = inf;
            for( auto v2: dp[i-1] ){
                res = min( res, v2.back() + (int)v1.size() - get(v1, v2) );
            }
            if( res != inf ){
                v1.push_back(res);
                dp[i].push_back(v1);
                v1.pop_back();
            }
        }
    }
    int ans = inf;
    for( auto vc: dp[n] )ans = min( ans, vc.back() );
    cout << ans;
}

• Subtask 1: 0 / 6
• Subtask 2: 0 / 41
• Subtask 3: 0 / 4
• Subtask 4: 0 / 49