http://poj.org/problem?id=2892 #include <functional> #include <algorithm> #include <cstdio> #include <vector> #include <map> #include <stack> #include <memory.h> using namespace std; map< int, int, less<int> > s; int query( int k ) { map<int, int, less<int> >::iterator it; it = s.lower_bound( k ); if( it->second > k ) return 0; return it->first - it->second + 1; } void destroy( int k ) { map< int, int, less<int> >::iterator it; it = s.lower_bound( k ); if( it->second > k ) return; pair<int,int> p = *it; s.erase( it ); if( p.second <= k-1 ) s.insert( pair<int,int>( k-1, p.second ) ); if( p.first >= k+1 ) s.insert( pair<int,int>( p.first, k+1 ) ); } void rebuild( int k ) { map< int, int, less<int> >::iterator it1, it2; it1 = s.lower_bound( k+1 ); it2 = s.lower_bound( k-1 ); pair<int,int> p; if( it1->second == k+1 ) { p.first = it1->first; s.erase( it1 ); } else p.first = k; if( it2->first == k-1 ) { p.second = it2->second; s.erase( it2 ); } else p.second = k; s.insert( p ); } stack<int> sk; int main( ) { int n, m, k; char c[2]; scanf( "%d%d", &n, &m ); s.insert( pair<int,int>( n, 1 ) ); while( m-- ) { scanf( "%1s", c ); if( c[0] == 'D' ) { scanf( "%d", &k ); sk.push( k ); destroy( k ); } else if( c[0] == 'Q' ) { scanf( "%d", &k ); printf( "%dn", query( k ) ); } else { rebuild( sk.top() ); sk.pop(); } } return 0; }
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