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Re:这道题还听有人说是dp,原来一道超级水题。In Reply To:这道题还听有人说是dp,原来一道超级水题。 Posted by:ccsu2008021220 at 2009-10-07 01:17:10 > 做题之前听说是dp,怀着dp的心情去解,后来越来越发现不对劲,值感觉这道题没学算法也能AC掉,就是一个简单的排序在加选取策略就a了,复杂度也就O(n). > 贴代码: > #include<iostream> > #include<algorithm> > using namespace std; > struct lct{ > int x,y; > }a[50001]; > struct pt_cmp > { > bool operator()(const lct &a,const lct &b)const > { > if ( a.x == b.x ) return a.y < b.y; > return a.x < b.x; > } 你更水,还o(n).....怪雷人的 > }; > int main() > { > int n; > while(cin>>n&&n) > { > for(int i=1;i<=n;i++) > cin>>a[i].x>>a[i].y; > sort(a+1,a+n+1,pt_cmp()); > int l=a[n].x,c=a[n].y; > int ans=1; > for(int j=n-1;j>=1;j--) > { > if(a[j].x==l) continue; > else > if(a[j].y>c) > { > c=a[j].y; > l=a[j].x; > ans++; > } > } > cout<<ans<<endl; > } > return 0; > } Followed by:
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