针对这个问题,我正在调试一些解决方案。针对以下代码片段,我认为pop()方法的逻辑有误,因为当执行“indexUsed--”时,空格会不断被移除,但删除元素时并不一定是连续的。
如果我错了,请随意纠正。
int stackSize = 300;
int indexUsed = 0;
int[] stackPointer = { -1, -1, -1 };
StackNode[] buffer = new StackNode[stackSize * 3];
void push(int stackNum, int value) {
int lastIndex = stackPointer[stackNum];
stackPointer[stackNum] = indexUsed;
indexUsed++;
buffer[stackPointer[stackNum]] = new StackNode(lastIndex, value);
}
int pop(int stackNum) {
int value = buffer[stackPointer[stackNum]].value;
int lastIndex = stackPointer[stackNum];
stackPointer[stackNum] = buffer[stackPointer[stackNum]].previous;
buffer[lastIndex] = null;
indexUsed--;
return value;
}
int peek(int stack) { return buffer[stackPointer[stack]].value; }
boolean isEmpty(int stackNum) { return stackPointer[stackNum] == -1; }
class StackNode {
public int previous;
public int value;
public StackNode(int p, int v) {
value = v;
previous = p;
}
}