The company posted strong earnings for the third quarter.Shares of Paycom Software (PAYC 0.39%) jumped 25.5% in October, according to data from S&P Global Market Intelligence. The web-based HR and payroll management provider accelerated revenue growth in the third quarter as it continues to automate workloads for back-office functions. After collapsing earlier this summer, Paycom shares have shot up over 45% in recent months as investors get enthusiastic about the long-term software winner again.Here's why ...