UVa : 11572 (Unique Snowflakes)



// http://uva.onlinejudge.org/external/115/11572.html
// Runtime: 0.416s
// Tag: Adhoc, set Window

/* 
 * File:   main.cpp
 * Author: shahab
 * Created on March 16, 2011, 8:17 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;

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

    while ( testCase-- ) {
        int n, ar [N + 10], previous_position [N + 10];
        scanf ("%d", &n);

        map <int, int> m;
        int cnt = 0;
        int maxi = 0;

        for ( int i = 1; i <= n; i++ ) {
            scanf ("%d", &ar [i]);
            previous_position [i] = m [ar [i]];
            m [ar [i]] = i;
        }

        int curr = 1;
        int previous = 1;

        for ( curr = 1; curr <= n; curr++ ) {
            if ( previous_position [curr] >= previous ) {
                maxi = max (maxi, curr - previous);
                previous = previous_position [curr] + 1;
            }
        }

        maxi = max (maxi, curr - previous);

        printf ("%d\n", maxi);
    }

    return 0;
}

// @END_OF_SOURCE_CODE
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