usaco-2.2-preface-pass

差点画蛇添足了，呵呵：

/*
ID: qq104801
LANG: C++
TASK: preface
*/

#include <iostream>
#include <fstream>
#include <string>
#include <vector>
#include <cstdio>

using namespace std;

int n;
char c[4][2]={'I','V','X','L','C','D','M'};
int cc[4][2]={0};

void calc(int n)
{
    int w=0;
    while(n!=0)
    {
        switch(n%10)
        {
            case 1:cc[w][0]++;break;
            case 2:cc[w][0]+=2;break;
            case 3:cc[w][0]+=3;break;
            case 4:cc[w][0]++;cc[w][1]++;break;
            case 5:cc[w][1]++;break;
            case 6:cc[w][1]++;cc[w][0]++;break;
            case 7:cc[w][1]++;cc[w][0]+=2;break;
            case 8:cc[w][1]++;cc[w][0]+=3;break;
            case 9:cc[w+1][0]++;cc[w][0]++;break;
            //case 0:cc[w+1][0]++;break;
        }
        n/=10;
        w++;
    }
}

void test()
{    
    freopen("preface.in","r",stdin);
    freopen("preface.out","w",stdout);
    cin>>n;
    while(n)calc(n--);
    int i,j;
    for(i=0;i<4;i++)
        for(j=0;j<2;j++)
            if(cc[i][j])cout<<c[i][j]<<" "<<cc[i][j]<<endl; 
}

int main () 
{        
    test();        
    return 0;
}

/*
ID: qq104801
LANG: C++
TASK: preface
*/

#include <iostream>
#include <fstream>
#include <string>
#include <vector>
#include <cstdio>

using namespace std;

int n;
char c[4][2]={'I','V','X','L','C','D','M'};
int cc[4][2]={0};

void calc(int n)
{
    int w=0;
    while(n!=0)
    {
        switch(n%10)
        {
            case 1:cc[w][0]++;break;
            case 2:cc[w][0]+=2;break;
            case 3:cc[w][0]+=3;break;
            case 4:cc[w][0]++;cc[w][1]++;break;
            case 5:cc[w][1]++;break;
            case 6:cc[w][1]++;cc[w][0]++;break;
            case 7:cc[w][1]++;cc[w][0]+=2;break;
            case 8:cc[w][1]++;cc[w][0]+=3;break;
            case 9:cc[w+1][0]++;cc[w][0]++;break;
            //case 0:cc[w+1][0]++;break;
        }
        n/=10;
        w++;
    }
}

void test()
{    
    freopen("preface.in","r",stdin);
    freopen("preface.out","w",stdout);
    cin>>n;
    while(n)calc(n--);
    int i,j;
    for(i=0;i<4;i++)
        for(j=0;j<2;j++)
            if(cc[i][j])cout<<c[i][j]<<" "<<cc[i][j]<<endl; 
}

int main () 
{        
    test();        
    return 0;
}

test data:

USER: cn tom [qq104801]
TASK: preface
LANG: C++

Compiling...
Compile: OK

Executing...
   Test 1: TEST OK [0.005 secs, 3372 KB]
   Test 2: TEST OK [0.003 secs, 3372 KB]
   Test 3: TEST OK [0.003 secs, 3372 KB]
   Test 4: TEST OK [0.003 secs, 3372 KB]
   Test 5: TEST OK [0.003 secs, 3372 KB]
   Test 6: TEST OK [0.003 secs, 3372 KB]
   Test 7: TEST OK [0.005 secs, 3372 KB]
   Test 8: TEST OK [0.003 secs, 3372 KB]

All tests OK.

Your program ('preface') produced all correct answers! This is your submission #2 for this problem. Congratulations!

Here are the test data inputs:

------- test 1 ----
1
------- test 2 ----
20
------- test 3 ----
100
------- test 4 ----
500
------- test 5 ----
1000
------- test 6 ----
2974
------- test 7 ----
3213
------- test 8 ----
3499

Keep up the good work!
Thanks for your submission!