力扣------用栈操作构建数组

/** * Note: The returned array must be malloced, assume caller calls free(). */
char ** buildArray(int* target, int targetSize, int n, int* returnSize){
    
    *returnSize=0;
    char **ans=(char**)calloc(200,sizeof(char*));
    int b=0;
    for(int a=1;a<=n;a++){
    
        ans[*returnSize]=(char*)calloc(5,sizeof(char));
        strcpy(ans[*returnSize], "Push\0");
        *returnSize=*returnSize+1; 
        if(target[b]!=a){
    
            ans[*returnSize]=(char*)calloc(4,sizeof(char));
            strcpy(ans[*returnSize], "Pop\0");
            *returnSize=*returnSize+1;             
        }    
        else{
    
            b++;
        }
        if(b==targetSize){
    
            break;
        }   
    }
    return ans;
}