UVA Problem#575

Question:
http://uva.onlinejudge.org/external/5/575.html 

Solution:
int main(){
.....
.... 
for(i=0; i<l; i++){
            s=1;
            for(j=l; j>i; j--){
                s*=2;
            }
   
            k+=((a[i]-48)*(s-1));
        }
......
..... 
} 

UVA Problem#438

Question:

http://uva.onlinejudge.org/external/4/438.html 

Solution:

int main(){

.....

.... 

m1= (y2-y1)/(x2-x1); 

m2= (y3-y1)/(x3-x1); 

if (m2==0){

  k= (x2-x3)/m1/2 + (y1+y2)/2; 

h= (x1+x3)/2; }

if (m1==0){

  k=(x3-x2)/m2/2 + (y1+y3)/2; 

h=(x1+x2)/2; 

}

else if (m1!=0&&m2!=0){ 

h= ((x1+x2)/m1 - (x1+x3)/m2 + y2-y3)/2/(1/m1 - 1/m2);

  k= ( h-(x1+x2)/2)/(-m1) + (y1+y2)/2; 

}

r= sqrt((h-x1)*(h-x1) + (k-y1)*(k-y1)); 

ans=2*pi*r;   

......

...

} 

UVA Problem#369

Question:

http://uva.onlinejudge.org/external/3/369.html 

Solution: 

double fact(int n){ 

int i; double f=1; 

for(i=2; i<=n; i++){ 

f = f*i; 

} 

return f; 

}

int main(){ 

....

.... 

c = fact(n) / ( fact(n-m) * fact(m) ) 

... 

}

UVA Problem#113

Question: 

http://uva.onlinejudge.org/external/1/113.html 

Solution:

y=exp((1/n)*log(p)); 

Addison-Wesley_Concrete.Mathematics

An essential book for solving the program related to mathematics! Very usefull though very difficult!!
click here to download

Introduction to Algorithm-Cormen

A book of algorithm by Cormen. Algorithms are must to do well in any kind of programming contest.
 
click here to download

Art of Programming Contest

A wonderful book for the amateur contestant. This book is a must to know all the ABC of a programming contest.

click here to download

or,

click here to download