Olimpiski igri (училишен '17) za 7/12

#include <bits/stdc++.h>
using namespace std;

int main() {
    int n;
    cin >> n;
    int a[100000] = {};
    for (int i = 0; i < n; ++i) cin >> a[i];
    int c = 0;
    int last = 0;
    for (int i = 0; i < n; ++i) {
        int v = a[i];
        int next = -1;
        if (i+1<n) next = a[i+1];
//        cout << "i:" << i << " last:" << last << " v:" << v << " next:" << next << endl;
        if (v == 0) {
            last = 0;
        } else if (v == 3) {
            if (next == 1) {
                last = 2;
                c++;
            } else {
                last = 1;
                c++;
            }
        } else { //1, 2
            if (last == v) {
                last = 0;
            } else { //v != last
//                if (next == 0 || next == v || next == 3) {
//                    last = v;
//                    c++;
//                } else {
                    //last = 0;
                    last = v;
                    c++;
                }
            }
        }
    }
    cout << c << endl;
}