Prefix Expression Evaluation

Medium Algorithmic Challenges

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Problem Statement

Write a C program to evaluate a given prefix expression (Polish notation) containing single-digit operands and operators (+, -, *, /).

Input Format

A prefix expression string S.

Output Format

Print the evaluated integer result.

Constraints

1 <= Length <= 50

Sample Input

-+7*45+20

Sample Output

Explanation

Evaluates prefix expression from right to left.

Starter Code

#include <stdio.h>
#include <string.h>

int main() {
    char s[51];
    if (scanf("%50s", s) == 1) {
        // Write your code here
    }
    return 0;
}

Limits

Time Limit: 1s
Memory Limit: 256MB

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