The Razorbacks used a 17-0 run spanning both halves to take the lead for good in a game that was closely contested before halftime. The win was Arkansas' 17th straight at Bud Walton Arena.
South Carolina trailed by as many as 23 points in the second half, but used a late 16-0 run to pull within 68-61 with 2:38 remaining. Hunter Mickelson and Brandon Mitchell scored baskets on consecutive possessions to help the Razorbacks put the game away.
Arkansas (17-8, 5-5 Southeastern Conference) snapped a two-game losing streak and bounced back from a surprising 22-point loss to Georgia on Wednesday.
"I'm very proud of them," Arkansas coach Mike Anderson said. "With all the things that have taken place with this team, the adversity that's taken place — new coach, new system, freshmen coming in.
"For these guys to withstand that and be where they are, they're in the hunt for something. I don't know what it is, but I couldn't be more proud of them."
Arkansas ended the first half on a 11-0 run to take a 38-27 halftime lead and continued the spurt into the second half. South Carolina went 8 minutes, 6 seconds without scoring during the stretch.
"We had the stretch at the end of the half where we did not take care of the ball," South Carolina coach Darrin Horn said.
"The problem when you play Arkansas with the way they play ... is not that they can turn you over, but that their turnovers lead to baskets."
Young, who finished one point from tying a career-high, scored 16 points before halftime. The freshman also had 5 rebounds and 4 assists.
Hunter Mickelson scored 11 points and DeVonta Abron added 10 points for the Razorbacks. Arkansas' bench accounted for 51 points.
Damontre Harris scored 12 points and Malik Cooke added 11 points for the Gamecocks (9-15, 1-9 SEC). South Carolina has now lost five straight games.