<p>A transaction is possibly invalid if:</p>

<ul>
	<li>the amount exceeds <code>$1000</code>, or;</li>
	<li>if it occurs within (and including) <code>60</code> minutes of another transaction with the <strong>same name</strong> in a <strong>different city</strong>.</li>
</ul>

<p>You are given an array of strings <code>transaction</code> where <code>transactions[i]</code> consists of comma-separated values representing the name, time (in minutes), amount, and city of the transaction.</p>

<p>Return a list of <code>transactions</code> that are possibly invalid. You may return the answer in <strong>any order</strong>.</p>

<p>&nbsp;</p>
<p><strong class="example">Example 1:</strong></p>

<pre>
<strong>Input:</strong> transactions = [&quot;alice,20,800,mtv&quot;,&quot;alice,50,100,beijing&quot;]
<strong>Output:</strong> [&quot;alice,20,800,mtv&quot;,&quot;alice,50,100,beijing&quot;]
<strong>Explanation:</strong> The first transaction is invalid because the second transaction occurs within a difference of 60 minutes, have the same name and is in a different city. Similarly the second one is invalid too.</pre>

<p><strong class="example">Example 2:</strong></p>

<pre>
<strong>Input:</strong> transactions = [&quot;alice,20,800,mtv&quot;,&quot;alice,50,1200,mtv&quot;]
<strong>Output:</strong> [&quot;alice,50,1200,mtv&quot;]
</pre>

<p><strong class="example">Example 3:</strong></p>

<pre>
<strong>Input:</strong> transactions = [&quot;alice,20,800,mtv&quot;,&quot;bob,50,1200,mtv&quot;]
<strong>Output:</strong> [&quot;bob,50,1200,mtv&quot;]
</pre>

<p>&nbsp;</p>
<p><strong>Constraints:</strong></p>

<ul>
	<li><code>transactions.length &lt;= 1000</code></li>
	<li>Each <code>transactions[i]</code> takes the form <code>&quot;{name},{time},{amount},{city}&quot;</code></li>
	<li>Each <code>{name}</code> and <code>{city}</code> consist of lowercase English letters, and have lengths between <code>1</code> and <code>10</code>.</li>
	<li>Each <code>{time}</code> consist of digits, and represent an integer between <code>0</code> and <code>1000</code>.</li>
	<li>Each <code>{amount}</code> consist of digits, and represent an integer between <code>0</code> and <code>2000</code>.</li>
</ul>

#include <vector>
#include <string>
#include <sstream>
using namespace std;

class Solution {
public:
    vector<string> invalidTransactions(vector<string>& transactions) {
        vector<string> result;
        
        // Parsing transactions
        vector<vector<string>> parsedTransactions;
        for (string transaction : transactions) {
            stringstream ss(transaction);
            string segment;
            vector<string> seglist;
            while (getline(ss, segment, ',')) {
                seglist.push_back(segment);
            }
            parsedTransactions.push_back(seglist);
        }
        
        // Marking invalid transactions
        for (int i = 0; i < parsedTransactions.size(); ++i) {
            bool invalid = false;
            int currAmount = stoi(parsedTransactions[i][2]);
            string currName = parsedTransactions[i][0];
            
            if (currAmount > 1000) {
                invalid = true;
            }
            
            for (int j = 0; j < parsedTransactions.size(); ++j) {
                if (i != j) {
                    string otherName = parsedTransactions[j][0];
                    int otherTime = stoi(parsedTransactions[j][1]);
                    string otherCity = parsedTransactions[j][3];
                    
                    if (currName == otherName && otherCity != parsedTransactions[i][3] 
                        && abs(stoi(parsedTransactions[i][1]) - otherTime) <= 60) {
                        invalid = true;
                        break;
                    }
                }
            }
            
            if (invalid) {
                result.push_back(transactions[i]);
            }
        }
        
        return result;
    }
};
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