CF546A Soldier and Bananas

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    • 735提交
  • 题目来源 CodeForces 546A
  • 评测方式 RemoteJudge
  • 标签 字符串 数论,数学 概率论,统计
  • 难度 入门难度
  • 时空限制 1000ms / 256MB

题解

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    题意翻译

    一个士兵想在商店里买W个香蕉。他必须为第一个香蕉支付K美元,第n个香蕉需要K*n美元

    他有N元。他从他的朋友士兵那里借了多少美元去买W香蕉?

    感谢@something 提供的翻译

    题目描述

    A soldier wants to buy $ w $ bananas in the shop. He has to pay $ k $ dollars for the first banana, $ 2k $ dollars for the second one and so on (in other words, he has to pay $ i·k $ dollars for the $ i $ -th banana).

    He has $ n $ dollars. How many dollars does he have to borrow from his friend soldier to buy $ w $ bananas?

    输入输出格式

    输入格式:

    The first line contains three positive integers $ k,n,w $ ( $ 1<=k,w<=1000 $ , $ 0<=n<=10^{9} $ ), the cost of the first banana, initial number of dollars the soldier has and number of bananas he wants.

    输出格式:

    Output one integer — the amount of dollars that the soldier must borrow from his friend. If he doesn't have to borrow money, output $ 0 $ .

    输入输出样例

    输入样例#1: 复制
    3 17 4
    
    输出样例#1: 复制
    13
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