C ，基于价值输入从2D数组中选择

这是一个非常非常非常非常简单的示例

#include <vector>
#include <string>
#include <iostream>
#include <stdio.h>
#include <stdlib.h>
#include <algorithm>
#include <iterator>
using namespace std;
typedef vector< string > StatInfo; // 47 enries
void print_stat_by_ip( const vector< StatInfo > & infos, const string & ip ) {
    for ( int i = 0, count = infos.size(); i < count; i++ ) {
        const StatInfo & info = infos[ i ];
        if ( info[ 4 ] == ip ) {
            copy( info.begin(), info.end(), ostream_iterator< string >( cout, ", " ) );
            cout << endl;
        }
    }
}
int main()
{
    vector< StatInfo > infos;
    for ( int i = 0; i < 10; i++ ) {
        StatInfo info;
        for ( int j = 0; j < 47; j++ ) { // just filling them "0", "1", "2", ... , "46"
            char c_str[ 42 ];
            sprintf( c_str, "%d", j ); 
            info.push_back( c_str );
        }
        char c_str[ 42 ];
        sprintf( c_str, "%d", rand() % 10 );
        info[ 4 ] = c_str;          // this will be an IP-address
        infos.push_back( info );
        copy( info.begin(), info.end(), ostream_iterator< string >( cout, ", " ) );
        cout << endl;
    }
    string ip_to_find = "5";
    cout << "----------------------------------------" << endl;
    cout << "stat for " << ip_to_find << endl;
    cout << "----------------------------------------" << endl;
    print_stat_by_ip( infos, ip_to_find );
}

您可以在这里找到它http://liveworkspace.org/code/3aaye8

老实说，我会考虑对您的容器进行重新考虑。以下内容使用标准的LIB数组，向量和多件事来完成我认为要寻找的目标。示例代码只会用字符串" A"，" B"或" C"以及三个IP地址之一来填充表行。您应该向特殊说明的零件是根据IP地址索引表格的多件使用（尽管很容易对其进行改装以对任何任意列进行相同的操作）。

注意：有很多人比我更精确地熟练地熟练地熟练地熟练地使用性病算法，功能和容器用法。您可能的解决方案。

编辑 OP希望查看表中IP地址的计数，该代码已修改为main()函数的尾部。还更新到不使用C 11功能。希望更接近OP可以使用的东西。

#include <iostream>
#include <iterator>
#include <algorithm>
#include <functional>
#include <map>
#include <vector>
#include <string>
using namespace std;
// some simple decls for our info, table, and IP mapping.
typedef std::vector<std::string> FlowInfo;
typedef std::vector<FlowInfo> FlowTable;
// a multi-map will likely work for what you want.
typedef std::multimap<std::string, const FlowInfo* > MapIPToTableIndex;
// a map of IP string-to-unsigned int for counting occurrences.
typedef std::map<std::string, unsigned int> MapStringToCount;
int main(int argc, char *argv[])
{
    // populate your flow table using whatever method you choose.
    //  I'm just going to push 10 rows of three ip addresses each.
    FlowTable ft;
    for (size_t i=0;i<10;++i)
    {
        FlowInfo fi(47); // note: always fixed at 47.
        for (size_t j=0;j<fi.size();++j)
            fi[j] = "A";
        fi[0][0]+=i;
        fi[4] = "192.168.1.1";
        ft.push_back(fi);
        for (size_t j=0;j<fi.size();++j)
            fi[j] = "B";
        fi[0][0]+=i;
        fi[4] = "192.168.1.2";
        ft.push_back(fi);
        for (size_t j=0;j<fi.size();++j)
            fi[j] = "C";
        fi[0][0]+=i;
        fi[4] = "192.168.1.3";
        ft.push_back(fi);
    }
    // map by IP address into something usefull.
    MapIPToTableIndex infomap;
    for (FlowTable::const_iterator it = ft.begin(); it != ft.end(); ++it)
        infomap.insert(MapIPToTableIndex::value_type((*it)[4], &*it));

    // prove the map is setup properly. ask for all items in the map
    //  that honor the 192.168.1.2 address.
    for (MapIPToTableIndex::const_iterator it = infomap.lower_bound("192.168.1.2");
         it != infomap.upper_bound("192.168.1.2"); ++it)
    {
        std::copy(it->second->begin(), it->second->end(),
                  ostream_iterator<std::string>(cout, " "));
        cout << endl;
    }
    // mine the IP occurance rate from the table:
    MapStringToCount ip_counts;
    for (FlowTable::const_iterator it= ft.begin(); it!=ft.end(); ++it)
        ++ip_counts[ (*it)[4] ];
    // dump IPs by occurrence counts.
    for (MapStringToCount::const_iterator it = ip_counts.begin();
         it != ip_counts.end(); ++it)
    {
        cout << it->first << " : " << it->second << endl;
    }
    return 0;
}

输出

B B B B 192.168.1.2 B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B 
C B B B 192.168.1.2 B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B 
D B B B 192.168.1.2 B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B 
E B B B 192.168.1.2 B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B 
F B B B 192.168.1.2 B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B 
G B B B 192.168.1.2 B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B 
H B B B 192.168.1.2 B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B 
I B B B 192.168.1.2 B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B 
J B B B 192.168.1.2 B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B 
K B B B 192.168.1.2 B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B 
192.168.1.1 : 10
192.168.1.2 : 10
192.168.1.3 : 10