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Question #21 Difficulty: 2

According to the Solidity 0.8.17 compiler (200 optimization runs) 

    // What does C.f() return?

contract C {
  mapping(uint256 => uint256) x;

  function f() external returns (uint256) {
    uint256 i = 0;
    while (i < 1000) {
      x[i] = i + 1;
    }
    return i;
  }
}

Hint:

It costs 20,000 gas to store a non-zero value into an unaccessed storage slot.

Answer:

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