2 строки, 4 слова, сравнение длины [C++]

#include <stdio.h>
#include <conio.h>
#include <string.h>

int prov (char *str);
void main ()
{
char A[20];

puts("\n Input A:\n");
gets(A);

switch(prov(A)){
case 1: printf(" 1 slovo > poslednego "); break;
case -1: printf(" poslednee slovo > 1 "); break;
case 0: printf(" 1 slovo = poslednemu "); break;
}
getch();
}
int prov (char *str)
{int i,l;
l=strlen(str);
for(i=l;i>=0;i=i-1)
if(str==' ') break;
l-=i+1;
for(i=0;i<l;i++)
if(str==' ') break;
if(l<i) return 1; else
if (l>i) return -1; else
return 0;

}

#include <iostream>
#include <string>
#include <vector>
using namespace std;
int _tmain(int argc, _TCHAR* argv[])
{
    string str1,str2;
    vector<string> coll1,coll2;
    cout<<"Input 1-st string : "<<' ';
    getline(cin,str1,'\n');  
    string::size_type pos = 0,prev_pos = 0;
    while(( pos = str1.find_first_of(' ',pos))
        != string::npos )
    {
        coll1.push_back(str1.substr(prev_pos,pos - prev_pos));
        prev_pos = ++pos;
    }
    coll1.push_back(str1.substr(prev_pos,pos - prev_pos));
    cout<<"Input 2-nd string : "<<' ';
    getline(cin,str2,'\n');  
    pos = 0,prev_pos = 0;
    while(( pos = str2.find_first_of(' ',pos))
        != string::npos )
    {
        coll2.push_back(str2.substr(prev_pos,pos - prev_pos));
        prev_pos = ++pos;
    }
    coll2.push_back(str2.substr(prev_pos,pos - prev_pos));
    if(coll1.back().size() < coll2.back().size())
     cout<<"word : "<<coll2.back()<<" > "<<coll1.back()<<endl;
    else if(coll1.back().size() == coll2.back().size())
        cout<<coll1.back()<<" = "<<coll2.back()<<endl;
    else
        cout<<"word : "<<coll1.back()<<" > "<<coll2.back()<<endl;
    if(coll1.back().size() < coll1[0].size())
     cout<<"word : "<<coll1[0]<<" > "<<coll1.back()<<endl;
    else if(coll1.back().size() == coll1[0].size())
        cout<<coll1.back()<<" = "<<coll1[0]<<endl;
    else
        cout<<"word : "<<coll1.back()<<" > "<<coll1[0]<<endl;
    if(coll2.back().size() < coll2[0].size())
     cout<<"word : "<<coll2[0]<<" > "<<coll2.back()<<endl;
    else if(coll2.back().size() == coll2[0].size())
        cout<<coll2.back()<<" = "<<coll2[0]<<endl;
    else
        cout<<"word : "<<coll2.back()<<" > "<<coll2[0]<<endl;
    return 0;
}