Time Limit: 5000/2500 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others)
Total Submission(s): 515 Accepted Submission(s): 241
#include <iostream> #include <cstdio> #include <cstring> #include <string> #include <cmath> #include <vector> #include <queue> #include <map> #include <set> #include <stack> #include <algorithm> using namespace std; typedef long long LL; typedef pair<int,int> pii; #define X first #define Y second const int N = 300010 ; const int inf = 1e9+7; int cnt[N] , tot ; struct node { int x , xx , id ; }e[N]; bool cmp1( const node &a , const node &b ){ return a.x < b.x ; } bool cmp2( const node &a , const node &b ){ return a.id < b.id ; } void run() { memset( cnt , 0 , sizeof cnt ) ; int n ; tot = 0 ; scanf("%d",&n); for( int i = 0 ; i < 2 * n ; ++i ){ scanf("%d",&e[i].x); e[i].id = i ; } sort( e , e + 2 * n , cmp1 ); e[0].xx = 1 ; for( int i = 1 ; i < 2 * n ; ++i ){ e[i].xx = ( e[i].x == e[i-1].x ? e[i-1].xx : e[i-1].xx + 1 ); } sort( e, e + 2 * n , cmp2 ) ; for( int i = 0 ; i < 2 * n ; i += 2 ){ cnt[ e[i].xx ] ++; cnt[ e[i+1].xx + 1 ] --; } int ans = 0 , sum = 0 ; for( int i = 0 ; i <= 2 * n ; ++i ){ sum += cnt[i]; ans = max( ans , sum ) ; } printf("%d\n",ans); } int main() { #ifdef LOCAL freopen("in.txt","r",stdin); #endif // LOCAL ios::sync_with_stdio(false); int _ ; scanf("%d",&_); while( _-- ) run() ; }
原文:http://www.cnblogs.com/hlmark/p/4134019.html