LeetCode 2797: Partial Function with Placeholders Solution

Master LeetCode problem 2797 (Partial Function with Placeholders), a easy challenge, with our optimized solutions in Java, C++, and Python. Explore detailed explanations, test your code in our interactive editor, and prepare for coding interviews.

2797. Partial Function with Placeholders

Easy

Problem Explanation

Explanation:

Given a function f(a, b, c) with three parameters, design a class PartialFunction that allows partial application of the function with placeholders. Placeholders are denoted by a special symbol, e.g., '_'. When a placeholder is used, the argument at that position is not provided during the function call.

Algorithmic Idea:

Create a class PartialFunction that stores the function f and the arguments passed during partial application.
Implement a method apply in the class that takes the remaining arguments to fill in the placeholders and returns the result of calling the function f with all arguments.
Replace the placeholders with the provided arguments during the apply method.
Maintain a count of placeholders to correctly map the arguments.
If all arguments are provided, call the function f with all arguments directly.

Time Complexity:

The time complexity for applying the function is O(n), where n is the number of arguments in the function.

Space Complexity:

The space complexity is O(n), where n is the number of arguments stored in the class.

Solution Code

class PartialFunction {
    private final TriFunction<Integer, Integer, Integer, Integer> f;
    private final List<Integer> args;

    public PartialFunction(TriFunction<Integer, Integer, Integer, Integer> f) {
        this.f = f;
        this.args = new ArrayList<>();
    }

    public void partial(int arg) {
        args.add(arg);
    }

    public int apply(int a, int b, int c) {
        List<Integer> filledArgs = new ArrayList<>(args);
        for (int i = 0; i < filledArgs.size(); i++) {
            if (filledArgs.get(i) == '_') {
                filledArgs.set(i, i == 0 ? a : (i == 1 ? b : c));
            }
        }
        return f.apply(filledArgs.get(0), filledArgs.get(1), filledArgs.get(2));
    }
}

@FunctionalInterface
interface TriFunction<A, B, C, R> {
    R apply(A a, B b, C c);
}

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