方便下 iOS 的工程师,帮忙转了下:

#import <Foundation/Foundation.h>

int main(int argc, const char * argv[]) {
@autoreleasepool {
// insert code here...
NSArray *a = @[@7,@2,@1,@3,@9,@0,@4,@6];
NSArray *b=@[@3,@1,@0,@2,@3,@4,@5,@6,@7];

NSMutableString *weChatString = [NSMutableString string];
for (NSNumber *i in b) {
[weChatString appendFormat:@"%@", a[[i intValue]]];
}
NSLog(@"%@", weChatString);
}
return 0;
}