随机分数题目

假如有十道题目，每道题目的分数是s,s是随机的（0<= s <= 20）,但是十道题目的总分不超过100分。求，十道题目计算完毕，一共是多少分。

do {
        
        NSInteger tempScore = 0;
        NSMutableArray *tempAry = [NSMutableArray array];
        for (NSInteger idx = 0; idx < 10 ; idx ++)
        {
            NSInteger s_idx = arc4random() % 21;
            tempScore += s_idx;
            [tempAry addObject:[NSNumber numberWithInteger:s_idx]];
        }
        if (tempScore < 100)
        {
            NSLog(@"%@ total %ld",tempAry,tempScore);
            break;
        }
        
    } while (true);

打印结果(答案不唯一)：

(
    6,
    19,
    1,
    12,
    17,
    3,
    14,
    1,
    20,
    5
) total 98

或者

do {
        
        NSMutableArray *tempAry = [NSMutableArray array];
        for (NSInteger idx = 0; idx < 10 ; idx ++)
        {
            NSInteger s_idx = arc4random() % 21;
            [tempAry addObject:[NSNumber numberWithInteger:s_idx]];
        }
        NSNumber *totalScole = [tempAry valueForKeyPath:@"@sum.self"];
        if (totalScole.integerValue < 100)
        {
            NSLog(@"%@ total %@",tempAry,totalScole);
            break;
        }
        
    } while (true);

使用Swift翻译一下

while true
        {
            var tempScole = 0
            var scoleAry = [Int]()
            for _ in 0...10
            {
                let scale = Int(arc4random()%21)
                tempScole += scale
                scoleAry.append(scale)
            }
            if tempScole < 100
            {
                print("every scole \(scoleAry) and total scole \(tempScole) ")
                break;
            }
        }

while true
        {
            let scoleAry = NSMutableArray()
            for _ in 0...10
            {
                let scale = Int(arc4random()%21)
                scoleAry.add(scale)
            }
            let totalScole : Int = scoleAry.value(forKeyPath: "@sum.self") as! Int
            if totalScole < 100
            {
                print("every scole \(scoleAry) and total scole \(totalScole) ")
                break;
            }
        }

假如您有更合适的方案，请留言。