How to use C language to realize train scheduling algorithm recursively

This article mainly introduces how to use C language recursive train scheduling algorithm, the text is very detailed, has a certain reference value, interested friends must read!

1. Code

The title is as follows:

2.8 Four trains numbered 1, 2, 3 and 4 pass through a stack of train dispatching stations. What are the possible dispatching results? If there are n trains passing through the dispatching station, please design an algorithm to output all possible dispatching results.

The idea of algorithm is to use stack + recursion, and the difficulty of algorithm lies in this. First the code:

#include #define MAX 100typedef struct s{ char a[MAX]; int top;}Stack;/* Define stack data *//* Define some global variables */Stack S;/* Define global stack */char d[MAX],seq[MAX];/*d[MAX] is used to store the original stack sequence, seq[MAX] is used to store the output sequence */int len;/* Defines the number of elements that will pass through the stack */ int count=0;/* is used to count the number of output sequences */void initStack(Stack *S) /* initializes the empty stack */{ S->top=-1;}void push(Stack *S,char x) /* push */{ if(S->top>=MAX) return; S->top++; S->a[S->top]=x;}char pop(Stack *S) /* pop */{ if (S->top==-1) { printf("ERROR, POP Empty Stack"); return -1; } S->top--; return S->a[S->top+1]; } int isEmpty(Stack *S)/* Determine whether the stack is empty */ { if (S->top==-1) return 1; return 0; } void outSeq(char *seq, int len)/* Output vertex sequence */ { int i; for(i=0; i