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| #include <cstdio>
#include <cstring>
#include <string>
#include <iostream>
#include <cstdlib>
#include <map>
#include <set>
#include <vector>
using namespace std;
struct Block {
int type;
char name[256];
Block *root;
Block *father;
vector<Block *> son;
Block(Block *fa, char name[], int type) {
strcpy(this->name, name);
root = fa->root;
father = fa;
this->type = type;
}
Block() {
strcpy(name, "\\");
type = 0;
root = this;
father = this;
}
Block *find(char name[], int type) {
if (strcmp(name, "\\") == 0) return root;
if (strcmp(name, "..") == 0) return father;
for (Block *bl:son) {
if (strcmp(bl->name, name) == 0 && bl->type == type) return bl;
}
return NULL;
}
int md(char name[]) {
if (find(name, 0) != NULL) {
cout << "directory already exist" << endl;
return 1;
} else {
Block *tmp = new Block(this, name, 0);
son.push_back(tmp);
cout << "success" << endl;
return 0;
}
}
int rd(char name[]) {
Block *p = find(name, 0);
if (p == NULL || p == father || p == root || p->son.size() > 0) {
cout << "can not delete the directory" << endl;
return 1;
} else {
for (vector<Block *>::iterator it = son.begin(); it != son.end(); it++) {
if (*it == p) {
son.erase(it);
delete p;
break;
}
}
cout << "success" << endl;
}
}
int ls() {
for (Block *bl:son) {
cout << bl->type << " " << bl->name << endl;
}
}
int cre(char name[]) {
if (find(name, 1) != NULL) {
cout << "file already exist" << endl;
return 1;
} else {
Block *tmp = new Block(this, name, 1);
son.push_back(tmp);
cout << "success" << endl;
return 0;
}
}
int del(char name[]) {
Block *p = find(name, 1);
if (p == NULL) {
cout << "no such file" << endl;
return 1;
} else {
for (vector<Block *>::iterator it = son.begin(); it != son.end(); it++) {
if (*it == p) {
son.erase(it);
delete p;
break;
}
}
cout << "success" << endl;
}
}
int pwd() {
if (this == root) {
cout << "\\";
return 0;
} else {
father->pwd();
cout << name << "\\";
}
return 0;
}
};
int cd(Block*&cur,char to[])
{
Block* p=cur->find(to,0);
if (p==NULL)
{
cout<<"no such directory"<<endl;
return 1;
}else {
cur=p;
cout<<"success"<<endl;
return 0;
}
}
int main() {
Block * root = new Block;
Block * dir=root;
char a[100],b[100];
while (cin>>a)
{
if (strcmp(a,"CD")==0) {
cin>>b;
cd(dir,b);
}
else if (strcmp(a,"MD")==0){
cin>>b;
dir->md(b);
}
else if (strcmp(a,"LS")==0) {
dir->ls();
} else if (strcmp(a,"RD")==0)
{
cin>>b;
dir->rd(b);
} else if (strcmp(a,"CREATE")==0)
{
cin>>b;
dir->cre(b);
}else if (strcmp(a,"DELETE")==0)
{
cin>>b;
dir->del(b);
} else if (strcmp(a,"PWD")==0){
dir->pwd();
cout<<endl;
}
}
return 0;
}
|