HDU : 1050 (Moving Tables)



// http://acm.hdu.edu.cn/showproblem.php?pid=1050
// Runtime: 15ms
// Tag: Adhoc

/* 
 * File:   main.cpp
 * Author: shahab
 * Created on March 18, 2011, 2:51 PM
 */

// @BEGIN_OF_SOURCE_CODE

#include <iostream>
#include <cstdio>
#include <algorithm>
#include <cstring>
#include <string>
#include <cctype>
#include <stack>
#include <queue>
#include <list>
#include <vector>
#include <map>
#include <sstream>
#include <cmath>
#include <bitset>
#include <utility>
#include <set>
#include <numeric>

#define INF_MAX 2147483647
#define INF_MIN -2147483647
#define pi acos(-1.0)
#define N 1000000
#define LL long long

#define For(i, a, b) for ( int i = (a); i < (b); i++ )
#define Fors(i, sz) for ( size_t i = 0; i < sz.size (); i++ )
#define Set(a, s) memset (a, s, sizeof (a))

using namespace std;

struct Block {
    int s;
    int t;
} a [200 + 5];

int main(int argc, char** argv) {
    int testCase;
    scanf ("%d", &testCase);

    while ( testCase-- ) {
        int n;
        scanf ("%d", &n);

        for ( int i = 0; i < n; i++ ) {
            scanf ("%d %d", &a [i].s, &a [i].t);
            if (a [i].s > a [i].t) swap (a [i].s, a [i].t);
            a [i].s = a [i].s % 2 ? a [i].s : a [i].s - 1;
            a [i].t= a [i].t % 2 ? a [i].t + 1 : a [i].t;
        }

        int blockRooms [400 + 5];
        Set (blockRooms, 0);

        for ( int i = 0; i < n; i++ ) {
            for ( int j = a [i].s; j <= a [i].t; j++ ) blockRooms [j]++;
        }

        int cnt = 0;
        for ( int i = 0; i < 405; i++ ) cnt = max (cnt, blockRooms [i]);

        printf ("%d\n", cnt * 10);
    }

    return 0;
}

// @END_OF_SOURCE_CODE
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