等差数列: 以k为首相,k为公差,w个数量的和与n的大小关系 输出max(sum-0,0)
Java程序
import java.util.Scanner; public class A546 { static void run(){
Scanner in = new Scanner(System.in);
int k =in.nextInt();
int n = in.nextInt();
int w = in.nextInt();
int count = 0;
count = (1+w)*w*k/2;
// System.out.println(count);
if(count>n){
System.out.println(count-n);
}else
System.out.println(0);
}
public static void main(String[] args){
run();
}
}
Python程序
def A546():
k,n,w = map(int, raw_input().split())
count = (1+w)*w*k*0.5
if count > n :
print int(count -n)
else:
print 0 if __name__=='__main__':
A546()