Reverse Polish Notation
Evaluate the value of an arithmetic expression in Reverse Polish Notation.
Medium6/2/2024
Problem statement
Given an expression in Reverse Polish Notation (postfix), evaluate the value of the expression. In Reverse Polish Notation, the operators follow their operands. For example, the expression 3 10 5 + * is equivalent to 3 * (10 + 5).
The expression is given as an array either integers or operators. So, for the expression [3, 10, 5, '+', '*'] you should return 45.
The result should be rounded to the nearest integer.
Problem leaderboard
# | Size | % | Users |
|---|---|---|---|
#1 | 66 c. | Top 8% |  |
#2 | 69 c. | Top 15% |  |
#3 | 71 c. | Top 23% |  |
#4 | 74 c. | Top 31% |  |
#5 | 77 c. | Top 38% |  |
#6 | 79 c. | Top 46% |  |
#7 | 89 c. | Top 54% |  |
#8 | 97 c. | Top 62% |  |
#9 | 124 c. | Top 69% |  |
#10 | 139 c. | Top 77% |  |
#11 | 169 c. | Top 85% |  |
#12 | 207 c. | Top 92% |  |
#13 | 656 c. | Top 100% |  |
© 2026 Corentin Thomasset