1.开启3个线程顺序打印1-100
- (void)print0_100 {
__block int i = 0;
NSCondition *condition = [[NSCondition alloc] init];
dispatch_async(dispatch_get_global_queue(0, 0), ^{
while (1) {
[condition lock];
while (i%3 != 0) {
[condition wait];
}
if (i > 100) {
[condition unlock];
return;
}
NSLog(@"A ==== i = %d",i);
i++;
[condition broadcast];
[condition unlock];
}
});
dispatch_async(dispatch_get_global_queue(0, 0), ^{
while (1) {
[condition lock];
while (i%3 != 1) {
[condition wait];
}
if (i > 100) {
[condition unlock];
return;
}
NSLog(@"B ==== i = %d",i);
i++;
[condition broadcast];
[condition unlock];
}
});
dispatch_async(dispatch_get_global_queue(0, 0), ^{
while (1) {
[condition lock];
while (i%3 != 2) {
[condition wait];
}
if (i > 100) {
[condition unlock];
return;
}
NSLog(@"C ==== i = %d",i);
i++;
[condition broadcast];
[condition unlock];
}
});
}
2.格式化字符串
给定⼀个只包含英⽂字⺟，半⻆标点（仅包括逗号，句号）和空格的字符串。请按如下规则将字符串 规范化： 1. 单词之间的空格只保留⼀个（需要删除多余的空格） 2. 标点之前的空格需要删除 3. 标点之后仅保留⼀个空格，若没有需要添加，若有两个或以上空格需要删除多余空格 4. 句⼦（以句号分割的字符串）⾸字⺟需要修正为⼤写，其他字⺟需要修正为⼩写 5. 多余的标点需要删除（⽐如连续重复逗号/句号仅保留⼀个）
#import "ViewController.h"
@interface ViewController ()
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
self.view.backgroundColor = [UIColor whiteColor];
[self upDateString:@"when a father gives to his son,,, Both laugh, When a son gives to his father, , , Both cry...shakespeare.."];
}
-(void)upDateString:(NSString *)string{
if(string.length == 0) return;
//去除多余的符号和空格
string = [self deleteRepeat:string withRepeatStr:@" "];
string = [self deleteRepeat:string withRepeatStr:@","];
string = [self deleteRepeat:string withRepeatStr:@"."];
NSLog(@"%@", string);
//全部转换为小写
string = [string lowercaseString];
//先去掉符号前后空格后续添加
string = [string stringByReplacingOccurrencesOfString:@". " withString:@"."];
string = [string stringByReplacingOccurrencesOfString:@", " withString:@","];
string = [string stringByReplacingOccurrencesOfString:@" ." withString:@"."];
string = [string stringByReplacingOccurrencesOfString:@" ," withString:@","];
NSArray * arrayK = [string componentsSeparatedByString:@"."];
NSMutableArray *resultArr = [NSMutableArray array];
for (NSString *arrayString in arrayK) {
//获取每个单词
NSMutableArray * arrayM = [[arrayString componentsSeparatedByString:@" "] mutableCopy];
//首个单词首字母大写
if(arrayM.count > 0){
NSString * first = arrayM[0];
NSString *resultStr;
resultStr = [first capitalizedString];
arrayM[0] = resultStr;
}
//拼成字符串
NSString *capStr = [arrayM componentsJoinedByString:@" "];
[resultArr addObject:capStr];
}
string = [resultArr componentsJoinedByString:@"."];
string = [string stringByReplacingOccurrencesOfString:@"." withString:@". "];
string = [string stringByReplacingOccurrencesOfString:@"," withString:@", "];
NSLog(@"%@", string);
}
//去掉多余字符串
-(NSString *)deleteRepeat:(NSString *)string withRepeatStr:(NSString *)repeatStr{
NSArray *stringArr = [string componentsSeparatedByString:repeatStr];
NSMutableArray *strArrM = [NSMutableArray array];
for (int i = 0 ; i< stringArr.count ; i++) {
NSString *str = stringArr[i];
if (![str isEqualToString:@""]){
[strArrM addObject:str];
}else{
//最后的符号不去掉
if(i == stringArr.count - 1){
[strArrM addObject:str];
}
}
}
string = [strArrM componentsJoinedByString:repeatStr];
return string;
}
@end
3.三联得分
给定⼀个 N×N 的棋盘，上⾯有两个玩家玩棋盘游戏的局⾯。其中玩家 A 的棋⼦⽤ O 表⽰，玩家 B 的棋 ⼦⽤ X 表⽰。请计算这个局⾯下两个玩家的得分。 得分计算规则如下： 1. 如果有三个相同棋⼦在连续相邻的格⼦上，称为三连，计⼀分。 2. 相邻是包括横竖斜⽅向上的相邻。 3. 两组三连只要不完全重复，可以分别计⼀分。
#import "ViewController.h"
@interface ViewController ()
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
self.view.backgroundColor = [UIColor whiteColor];
NSArray *arr = @[@[@".",@".",@".",@".",@".",@".",@".",@".",@"x",@"x",@"."],
@[@"x",@".",@".",@".",@".",@"x",@".",@".",@".",@".",@"."],
@[@".",@".",@".",@".",@".",@".",@".",@"x",@".",@".",@"."],
@[@".",@".",@".",@"o",@"o",@"o",@".",@".",@".",@".",@"."],
@[@".",@".",@".",@"o",@"o",@"o",@"o",@"x",@".",@".",@"."],
@[@".",@".",@".",@"o",@"o",@"o",@".",@".",@".",@".",@"."],
@[@".",@".",@".",@".",@"o",@".",@".",@".",@".",@".",@"."],
@[@".",@"x",@".",@".",@".",@".",@".",@".",@".",@".",@"."],
@[@".",@".",@".",@".",@".",@".",@"x",@".",@".",@".",@"."],
@[@".",@".",@".",@".",@".",@".",@".",@".",@".",@"x",@"."],
@[@".",@".",@".",@".",@".",@".",@".",@".",@".",@"x",@"."]
];
[self calculateScore:arr];
}
-(void)calculateScore:(NSArray *)arr {
NSString * x = @"x";
NSString * o = @"o";
int xPoint = 0;
int oPoint = 0;
for (int i = 0; i < arr.count; i++) {
for (int j = 0; j < arr.count; j++) {
NSString *start = arr[i][j];
//1.判断横轴是否连续三个能得分
if (i < arr.count - 2 && start == arr[i + 1][j] && start == arr[i + 2][j]) {
if (start == x) {
xPoint += 1;
} else if (start == o) {
oPoint += 1;
}
}
//2.判断斜着是否连续三个能得分
//右下侧斜
if (i < arr.count - 2 && j < arr.count - 2 && start == arr[i + 1][j + 1] && start == arr[i + 2][j + 2]) {
if (start == x) {
xPoint += 1;
} else if (start == o) {
oPoint += 1;
}
}
//右上侧斜
if (i < arr.count - 2 && j > 1 && start == arr[i + 1][j - 1] && start == arr[i + 2][j - 2]) {
if (start == x) {
xPoint += 1;
} else if (start == o) {
oPoint += 1;
}
}
//3.判断竖着三个是否能得分
if (j < arr.count - 2 && start == arr[i][j + 1] && start == arr[i][j + 2]) {
if (start == x) {
xPoint += 1;
} else if (start == o) {
oPoint += 1;
}
}
}
}
//打印得分
NSLog(@"%d",oPoint);
NSLog(@"%d",xPoint);
}
@end
