test.sol

// SPDX-License-Identifier: GPL-3.0
pragma solidity >=0.8.0 <0.9.0;

contract D1 {
    function A() public pure { // 21437, MAX
        uint256 x;
        x+=1;
    }
    function B() public pure { // 21333, min
        uint256 x;
        x++;
    }
    function C() public pure { // 21350, mid
        uint256 x;
        ++x;
    }
}

contract D2 {
    uint256 x = 1; // Avoid the assignment case from zero to non-zero

    function A() public { // 26451, MAX
        x+=1;
    }
    function B() public { // 26346, min
        x++;
    }
    function C() public { // 26362, mid
        ++x;
    }
}

contract D3 {
    uint256 x = 1; // Avoid the assignment case from zero to non-zero

    function A() external { // 26451, MAX
        x+=1;
    }
    function B() external { // 26346, min
        x++;
    }
    function C() external { // 26362, mid
        ++x;
    }
}