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Uva101-STL模拟

2015-09-07 00:10 316 查看
一道有点复杂的STL模拟题,对STL迭代器不太熟悉改了好久,最后总算A了出来。

感觉用数组更方便。。。但是为了练习STL嘛

对比白书上的代码,我写的还是傻了点。一开始没有理解四个操作的意思,单纯的模拟。

#include <algorithm>
#include <cstring>
#include <ctype.h>
#include <cstdlib>
#include <cstdio>
#include <vector>
#include <string>
#include <queue>
#include <stack>
#include <cmath>
#include <set>
#include <map>

using namespace std;

int N,M,T;
vector <int> v[30];

int getpos(int x)
{
for(int i=0;i<N;i++)
{
vector <int>::iterator it = v[i].begin();
it = find(v[i].begin(),v[i].end(),x);
if(it != v[i].end())
{
return i;
}
}
return -1;
}

void repose(int x,int a)
{
for(vector<int>::iterator it = v[x].begin();it != v[x].end();++it)
{
if(*it == a)
{
if(++it == v[x].end()) return;
for(vector<int>::iterator it2 = it;it2 != v[x].end();++it2)
{
int k = *it2;
vector<int>::iterator beg = v[k].begin();
//printf("%d %d\n",k,(int)v[k].size());
//-    while(1);
v[k].insert(beg,k);
}
v[x].erase(it,v[x].end());
break;
}
}
return;
}

void move_onto(int a,int b)
{
int x = getpos(a),y = getpos(b);
repose(x,a);repose(y,b);
for(vector<int>::iterator it = v[x].begin();it != v[x].end();++it)
{
if(*it == a)
{
v[x].erase(it);
break;
}
}
for(vector<int>::iterator it = v[y].begin();it != v[y].end();++it)
{
if(*it == b)
{
v[y].push_back(a);
break;
}
}
return;
}

void move_over(int a,int b)
{
int x = getpos(a),y = getpos(b);
repose(x,a);
for(vector<int>::iterator it = v[x].begin();it != v[x].end();++it)
{
if(*it == a)
{
v[x].erase(it);
break;
}
}
v[y].push_back(a);
return;
}

void pile_over(int a,int b)
{
int x = getpos(a),y = getpos(b);
for(vector<int>::iterator it = v[x].begin();it != v[x].end();++it)
{
if(*it == a)
{
for(vector<int>::iterator it2 = it;it2 != v[x].end();++it2) v[y].push_back(*it2);
v[x].erase(it,v[x].end());
break;
}
}
return;
}

void pile_onto(int a,int b)
{
int x = getpos(a),y = getpos(b);
repose(y,b);
for(vector<int>::iterator it = v[x].begin();it != v[x].end();++it)
{
if(*it == a)
{
for(vector<int>::iterator it2 = it;it2 != v[x].end();++it2) v[y].push_back(*it2);
v[x].erase(it,v[x].end());
break;
}
}
return;
}

int main()
{
while(~scanf("%d",&N))
{
int a,b;
char op[10],s[10];
for(int i=0;i<N;i++) {v[i].clear();v[i].push_back(i);}

while(scanf("%s",op) && op[0] != 'q')
{
scanf("%d %s %d",&a,s,&b);
if(getpos(a) == getpos(b)) continue;
if(!strcmp(op,"move") && !strcmp(s,"onto")) move_onto(a,b);
else if(!strcmp(op,"move") && !strcmp(s,"over")) move_over(a,b);
else if(!strcmp(op,"pile") && !strcmp(s,"onto")) pile_onto(a,b);
else if(!strcmp(op,"pile") && !strcmp(s,"over")) pile_over(a,b);
}
for(int i=0;i<N;i++)
{
printf("%d:",i);
for(int j = 0;j < (int)v[i].size();j++) printf(" %d",v[i][j]);
printf("\n");
}
}
}
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