{"trustable":false,"prependHtml":"\u003cscript\u003e window.katexOptions \u003d { disable: true }; \u003c/script\u003e\n\u003cscript type\u003d\"text/x-mathjax-config\"\u003e\n MathJax.Hub.Config({\n tex2jax: {\n inlineMath: [[\u0027$$$\u0027,\u0027$$$\u0027], [\u0027$\u0027,\u0027$\u0027]],\n displayMath: [[\u0027$$$$$$\u0027,\u0027$$$$$$\u0027], [\u0027$$\u0027,\u0027$$\u0027]]\n }\n });\n\u003c/script\u003e\n\u003cscript async src\u003d\"https://mathjax.codeforces.org/MathJax.js?config\u003dTeX-AMS-MML_HTMLorMML\" type\u003d\"text/javascript\"\u003e\u003c/script\u003e","sections":[{"title":"描述","value":{"format":"HTML","content":" CCPCfinal都要开始啦!dcm师哥居然还在看电视???给定若干电视节目的开始和结束时间(整点时刻),试计算出师哥最多能完整看完的节目数。"}},{"title":"输入","value":{"format":"HTML","content":" 输入数据包含多个测试实例。\n\u003cbr\u003e 每个测试实例的第一行只有一个整数n(n≤100),表示节目的总数。\n\u003cbr\u003e 然后是n行数据,每行包括两个正整数Ti_s,Ti_e,分别表示第i个节目的开始和结束时刻。注意这n个节目的时刻表并不是有序给出的。\n\u003cbr\u003e 当输入的n为0时,结束输入。"}},{"title":"输出","value":{"format":"HTML","content":" 对于每组输入,输出能完整看到的电视节目的个数。\n\u003cbr\u003e 每组输出占一行。"}},{"title":"样例输入","value":{"format":"HTML","content":"\u003cpre\u003e12\n1 3\n3 4\n0 7\n3 8\n15 19\n15 20\n10 15\n8 18\n6 12\n5 10\n4 14\n2 9\n0\u003c/pre\u003e"}},{"title":"样例输出","value":{"format":"HTML","content":"\u003cpre\u003e5\u003c/pre\u003e"}},{"title":"Hint","value":{"format":"HTML","content":""}}]}