2017 Multi-University Training Contest
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比赛的时候没有主攻这道题,其实这个题目的关键是那个 l * r 大家都没想出来,遗憾。
角度排序,枚举角度即可。这里利用对称性进行了代码优化。
#include<iostream> #include<cstdio> #include<algorithm> #include<vector> #include<cmath> #include<cstdlib> using namespace std; typedef struct node { double ang; int x,y,val; bool operator <(const node t) const { return ang<t.ang;}}node;vector<node> se; int main(){ freopen("fuck.txt","r",stdin); int T,n; scanf("%d",&T); for(int Case=1;Case<=T;Case++) { se.clear(); scanf("%d",&n); long long l=0,r=0,ans=0; for(int i=1;i<=n;i++) { int a,b,c; node te; scanf("%d%d%d",&a,&b,&c); te.x=a; te.y=b; te.ang=atan(double(b)/a); te.val=c; se.push_back(te);}sort(se.begin(),se.end());for(int i=0;i<se.size();i++){if(se[i].x>=0) r+=se[i].val;else l+=se[i].val; }ans=l*r;for(int i=0;i<se.size();i++){if(se[i].x>=0) {r-=se[i].val;l+=se[i].val;}else{l-=se[i].val;r+=se[i].val;}ans=max(ans,l*r);}printf("%lld\n",ans);}return 0;}
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- 2017 Multi-University Training Contest
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- 2017 Multi-University Training Contest
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- 2017 Multi-University Training Contest
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- 2017 Multi-University Training Contest
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- 2017 Multi-University Training Contest
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