Assignment

Problem's Link: http://acm.hdu.edu.cn/showproblem.php?pid=5289

Mean:

给你一个数列和一个k，求连续区间的极值之差小于k的数的个数。

analyse:

用两个优先队列来维护区间的最大值和最小值，每次插入新值的时候检查区间内的极值差是否满足条件，不满足就将最左边的数删除，直到满足条件为止。ans每次加上区间的长度即得最终答案。

Time complexity: O(N)

Source code:

/*
* this code is made by crazyacking
* Verdict: Accepted
* Submission Date: 2015-07-21-21.38
* Time: 0MS
* Memory: 137KB
*/
#include <queue>
#include <cstdio>
#include <set>
#include <string>
#include <stack>
#include <cmath>
#include <climits>
#include <map>
#include <cstdlib>
#include <iostream>
#include <vector>
#include <algorithm>
#include <cstring>
#define  LL long long
#define  ULL unsigned long long
using namespace std;int main()
{ios_base::sync_with_stdio( false );cin.tie( 0 );int Cas;cin >> Cas;while( Cas-- ){int n, k, tmp;cin >> n >> k;vector<int> v;for( int i = 0; i < n; ++i ){cin >> tmp;v.push_back( tmp );}multiset<pair<int, int> > q1, q2;int l = 0, r = 0;LL ans = 0;while( r < n ){q1.insert( make_pair( v[r], r ) ), q2.insert( make_pair( -v[r], r ) );while( -( *q1.begin() ).first - ( *q2.begin() ).first >= k ){q1.erase( make_pair( v[l] , l ) ), q2.erase( make_pair( -v[l], l ) );l++;}ans += r - l + 1;r++;}cout << ans << endl;}return 0;
}
/**/

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2015 Multi-University Training Contest 1 - 1002 Assignment

Assignment

Problem's Link: http://acm.hdu.edu.cn/showproblem.php?pid=5289

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