size

如果这张图是个DAG，那么最长链就是第一个答案，所以就先tarjan缩点。 第二部分拓扑排序解决，注意重边会影响答案，所以不要重复转移。 #include <bits/stdc++.h> namespace IO { char buf[1 << 21], *p1 = buf, *p2 = buf; int p, p3 = -1; void read() {} inline int getc() { return p1 == p2 && (p2 = (p1 = buf) + fread(buf, 1, 1 << 21, stdin), p1 == p2) ? EOF : *p1++; } template <typename T, typename... T2> inline void read(T &x, T2 &... oth) { T f = 1; x = 0; char ch = getc(); while (!isdigit(ch)) { if (ch == '-') f = -1; ch = getc(); } while (isdigit(ch)) { x = x * 10 + ch - 48; ch = getc(); } x *= f; read(oth...); } } const int N = 2e5 + 7; const int M = 2e6 + 7;

#pragma mark - InterpolatedUIImage= 因为生成的二维码是一个 CIImage ，我们直接转换成 UIImage 的话大小不好控制，所以使用下面方法返回需要大小的 UIImage - ( UIImage *)createNonInterpolatedUIImageFormCIImage:( CIImage *)image withSize:( CGFloat ) size { CGRect extent = CGRectIntegral (image. extent ); CGFloat scale = MIN (size/CGRectGetWidth(extent), size/CGRectGetHeight(extent)); // create a bitmap image that we'll draw into a bitmap context at the desired size; size_t width = CGRectGetWidth (extent) * scale; size_t height = CGRectGetHeight (extent) * scale; CGColorSpaceRef cs = CGColorSpaceCreateDeviceGray (); CGContextRef bitmapRef =

新建UIImage分类如下： @interface UIImage (RoundedRectImage) - (UIImage *)setRoundedCorners:(CGFloat)radius andSize:(CGSize)size; @end #import "UIImage+RoundedRectImage.h" @implementation UIImage (RoundedRectImage) - (UIImage *)setRoundedCorners:(CGFloat)radius andSize:(CGSize)size{ CGRect rect = CGRectMake(0, 0, size.width, size.height); UIGraphicsBeginImageContextWithOptions(size, NO, [UIScreen mainScreen].scale); CGContextRef ctx = UIGraphicsGetCurrentContext(); UIBezierPath * path = [UIBezierPath bezierPathWithRoundedRect:rect byRoundingCorners:UIRectCornerAllCorners cornerRadii:CGSizeMake(radius,

自定义Model var list = T . OrderBy ( p => p . Id ) . Skip ( ( page - 1 ) * size ) . Take ( size ) . ToList ( ) 项目实体类 var list = T . PageList ( T , page , size ) . ToList ( ) ; T 是进行分页的数据集 page当前页（默认1） size 每页显示条数 来源： CSDN 作者： 看不見的距離 链接： https://blog.csdn.net/qq_43137834/article/details/104070594

uicollectionview下单独使用uibutton然后setimage或者直接使用uiimageview然后一定角度旋转后发现size会变动 解决方案：添加uibutton到uicollectionvview然后添加uiimageview到uibutton上而后旋转没有问题 但是点击时候即便设置的uiimageview的相关可点击属性依然无法实现button的点击，解决途径：tapgesture判断 代码如下： self.subThemeGobackBtn = [UIButton buttonWithType:UIButtonTypeCustom]; self.subThemeGobackBtn.frame = CGRectMake(self.collectionView.bounds.size.width / 2 + 60.0f, positionY, 0.0f, 0.0f); [self.subThemeGobackBtn setBackgroundColor:[UIColor clearColor]]; // [self.subThemeGobackBtn addTarget:self action:@selector(gobackToPerviousScreen:) forControlEvents:UIControlEventTouchUpInside];