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#include <bits/stdc++.h>
using namespace std;
int dp[101][5],n,a[105];
int solve(int i,int last)
{
    if(i == n)
        return 0;
    int &reff = dp[i][last];
    if(reff != -1) return reff;
    reff = 1e9;
    if(a[i] == 0)
        reff = min(reff,1 + solve(i + 1,0));
    else if(last == 1 && a[i] == 1)
        reff = min(reff,1 + solve(i + 1,0));
    else if (last == 2 && a[i] == 2)
        reff = min(reff,1 + solve(i + 1,0));
    else if(a[i] == 3)
    {
        if(last != 1)
         reff = min(reff,solve(i + 1,1));
        if(last != 2)
         reff = min(reff,solve(i + 1,2));
         reff = min(reff,1 + solve(i + 1,0));
 
    }
    else
        reff = min(reff,solve(i + 1,a[i]));
    return reff;
}
int main()
{
    memset(dp,-1,sizeof(dp));
 
    cin >> n;
    for(int i=0; i<n; i++)cin >> a[i];
    cout << solve(0,0);
 
    return 0;
}

Main.java:1: error: illegal character: '#'
#include <bits/stdc++.h>
^
Main.java:1: error: class, interface, or enum expected
#include <bits/stdc++.h>
         ^
Main.java:3: error: class, interface, or enum expected
int dp[101][5],n,a[105];
^
Main.java:4: error: class, interface, or enum expected
int solve(int i,int last)
^
Main.java:8: error: class, interface, or enum expected
    int &reff = dp[i][last];
    ^
Main.java:9: error: class, interface, or enum expected
    if(reff != -1) return reff;
    ^
Main.java:10: error: class, interface, or enum expected
    reff = 1e9;
    ^
Main.java:11: error: class, interface, or enum expected
    if(a[i] == 0)
    ^
Main.java:13: error: class, interface, or enum expected
    else if(last == 1 && a[i] == 1)
    ^
Main.java:15: error: class, interface, or enum expected
    else if (last == 2 && a[i] == 2)
    ^
Main.java:17: error: class, interface, or enum expected
    else if(a[i] == 3)
    ^
Main.java:21: error: class, interface, or enum expected
        if(last != 2)
        ^
Main.java:23: error: class, interface, or enum expected
         reff = min(reff,1 + solve(i + 1,0));
         ^
Main.java:25: error: class, interface, or enum expected
    }
    ^
Main.java:28: error: class, interface, or enum expected
    return reff;
    ^
Main.java:29: error: class, interface, or enum expected
}
^
Main.java:34: error: class, interface, or enum expected
    cin >> n;
    ^
Main.java:35: error: class, interface, or enum expected
    for(int i=0; i<n; i++)cin >> a[i];
    ^
Main.java:35: error: class, interface, or enum expected
    for(int i=0; i<n; i++)cin >> a[i];
                 ^
Main.java:35: error: class, interface, or enum expected
    for(int i=0; i<n; i++)cin >> a[i];
                      ^
Main.java:36: error: class, interface, or enum expected
    cout << solve(0,0);
    ^
Main.java:38: error: class, interface, or enum expected
    return 0;
    ^
Main.java:39: error: class, interface, or enum expected
}
^
23 errors

Standard output is empty