1101B - Accordion - CodeForces Solution

#include <bits/stdc++.h>

using namespace std;

void solve()
{
    string s;
    cin >> s;
    long long ind = 0;
    int g = 0;
    for (long long i = 0; i < s.size(); i++)
    {
        if (s[i] == '[')
        {
            ind = i;
            g++;
            break;
        }
    }
    if (g == 0)
    {
        //cout << "intru1";
        cout << -1;
        return;
    }
    long long tmp = g;
    for (long long i = ind + 1; i < s.size(); i++)
    {
        if (s[i] == ':')
        {
            ind = i;
            g++;
            break;
        }
    }
    long long left = ind;
    if (g == tmp)
    {
        //cout << "intru2";
        cout << -1;
        return;
    }

    tmp = g;
    for (long long i = s.size() - 1; i >= ind + 1; i--)
    {
        if (s[i] == ']')
        {
            ind = i;
            g++;
            break;
        }
    }
    if (g == tmp)
    {
        //cout << "intru4";
        cout << -1;
        return;
    }


    tmp = g;
    for (long long i = ind; i >= left  + 1; i--)
    {
        if (s[i] == ':')
        {
            ind = i;
            g++;
            break;
        }
    }
    long long right = ind;
    if (g == tmp)
    {
        //cout << "intru3";
        cout << -1;
        return;
    }

    long long cnt = 0;
    for (long long i = left; i <= right; i++)
    {
        if (s[i] == '|')
            cnt++;
    }
    cout << 4 + cnt;
}


int main()
{
    ios_base::sync_with_stdio(0);   
    cin.tie(0);
    cout.tie(0);

    //int t;
    //cin >> t;
    //while (t--)
    //    solve();
    solve();

    return 0;
}