[摘要] Validate if a given string is numeric.Some examples:"0"=>true" 0.1 "=>true"abc"=>false"1 a"=>false"2e10"=>trueNote:It is intended for the problem stat[全文]
[摘要] 點(diǎn)與點(diǎn)之間, 線與線之間,點(diǎn)與線之間的位置關(guān)系是一類非常重要的問題。它不僅是平面幾何學(xué)的基石,也常常應(yīng)用于LBS(Location Based Service),社交網(wǎng)絡(luò),以及數(shù)據(jù)庫(kù)查詢等領(lǐng)域。本文中,我將給出判斷這些關(guān)系的...[全文]
[摘要] 數(shù)組大小要大于根號(hào)下最大值long long f[340000],g[340000],n;void init(){ long long i,j,m; for(m=1;m*m<=n;++m)f[m]=n/m-1; for(i=1;i<=m;++i)g[i]=i-1; for(i[全文]