After retiring II times do title record

After retiring II times do title record

Nothing good feel more of goo.

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atcoder1219 historical research

Mo rollback team.

[Six provinces exam 2017] combination of several issues

I'm an idiot

Significance is equivalent to a combination according to \ (NK \) an article selected from articles \ (\ mod k \) I \ (R & lt \) program number, moment by direct optimization.

[2017 exam six provinces] Encounter is greeting

\(c^x\mod p=c^{x\mod \varphi(p)+\varphi(p)}\mod p(x>p)\)

\ (\ varphi \) jump \ (\ log \) times will jump to \ (1 \) .

Take the time to write such a film with Euler's theorem:int Mod(ll a,int b){return a<b?a:a%b+b;}

[Six provinces exam 2017] wish is to break up

N long push hard Gaussian elimination ,,, differential state to

[BJWC2018] Border four Seeking

Violence (fog

CF809E

Ts seem to cut through the morning = =

\(\varphi(ab)=\frac{\varphi(a)\varphi(b)\gcd(a,b)}{\varphi(\gcd(a,b))}\)

Write a serious

\(\sum_i\sum_jdist(i,j)\frac{\varphi(a_i)\varphi(a_j)\gcd(a_i,a_j)}{\varphi(\gcd(a_i,a_j))}\)

\(\sum_i\varphi(a_i)\sum_j\varphi(a_j)dist(i,j)\frac{\gcd(a_i,a_j)}{\varphi(\gcd(a_i,a_j))}\)

\(\sum_d\frac{d}{\varphi(d)}\sum_{d|a_i}\varphi(a_i)\sum_{d|a_j}\varphi(a_j)dist(i,j)[\gcd(a_i,a_j)==d]\)

\(\sum_d\frac{d}{\varphi(d)}\sum_{d|a_i}\varphi(a_i)\sum_{d|a_j}\varphi(a_j)dist(i,j)\sum_{d|o,o|a_i,o|a_j}\mu(\frac{o}{d})\)

\(\sum_o(\sum_{d|o}\frac{d}{\varphi(d)}\mu(\frac{o}{d}))(\sum_{o|a_i}\varphi(a_i)\sum_{o|a_j}\varphi(a_j)dist(i,j))\)

\ (D \) section to do just the right enumeration \ (O \) after the \ (O \) multiple virtual tree to build run out on the line, the complexity of the two \ (\ log \)

And this ghost measured my question dozen min = =

CF125E

Convex optimization problem board

However, convex optimization boundary Good ** Kichiku ,,, WA burst

Precision-half to set smaller (otherwise you will harvest a large WA