{"trustable":false,"prependHtml":"\u003cstyle type\u003d\u0027text/css\u0027\u003e\n .input, .output {\n border: 1px solid #888888;\n }\n .output {\n margin-bottom: 1em;\n position: relative;\n top: -1px;\n }\n .output pre, .input pre {\n background-color: #EFEFEF;\n line-height: 1.25em;\n margin: 0;\n padding: 0.25em;\n }\n \u003c/style\u003e\n \u003clink rel\u003d\"stylesheet\" href\u003d\"//codeforces.org/s/96598/css/problem-statement.css\" type\u003d\"text/css\" /\u003e\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 type\u003d\"text/javascript\" async src\u003d\"https://mathjax.codeforces.org/MathJax.js?config\u003dTeX-AMS_HTML-full\"\u003e\u003c/script\u003e","sections":[{"title":"","value":{"format":"MD","content":"一个区间中若有一段连续的子区间的区间和为0,则这个区间是不好的\n\n给定一个区间a求这个区间内有多少好的子区间"}},{"title":"Input","value":{"format":"MD","content":"\u003cp\u003eThe first line of the input contains a single integer n (1\u003c\u003dn\u003c\u003d2e5) \u0026nbsp;— the length of array a.\u003c/p\u003e\n\u003cp\u003eThe second line of the input contains n integers a[1], a[2], ..... , a[n] (-1e9\u003c\u003da[i]\u003c\u003d1e9) \u0026nbsp;— the elements of a. \u003c/p\u003e"}},{"title":"Output","value":{"format":"MD","content":"\u003cp\u003eOutput a single integer \u0026nbsp;— the number of \u003cspan class\u003d\"tex-font-style-bf\"\u003egood\u003c/span\u003e subarrays of a.\u003c/p\u003e"}},{"title":"Examples","value":{"format":"MD","content":"\u003cdiv class\u003d\"sample-test\"\u003e\n \u003cdiv class\u003d\"input\"\u003e\n \u003cdiv class\u003d\"title\"\u003e\n Input\n \u003c/div\u003e\n \u003cpre\u003e3\n1 2 -3\n\u003c/pre\u003e\n \u003c/div\u003e\n \u003cdiv class\u003d\"output\"\u003e\n \u003cdiv class\u003d\"title\"\u003e\n Output\n \u003c/div\u003e\n \u003cpre\u003e5\n\u003c/pre\u003e\n \u003c/div\u003e\n \u003cdiv class\u003d\"input\"\u003e\n \u003cdiv class\u003d\"title\"\u003e\n Input\n \u003c/div\u003e\n \u003cpre\u003e3\n41 -41 41\n\u003c/pre\u003e\n \u003c/div\u003e\n \u003cdiv class\u003d\"output\"\u003e\n \u003cdiv class\u003d\"title\"\u003e\n Output\n \u003c/div\u003e\n \u003cpre\u003e3\n\u003c/pre\u003e\n \u003c/div\u003e\n\u003c/div\u003e"}},{"title":"Note","value":{"format":"MD","content":"\u003cp\u003eIn the first sample, the following subarrays are \u003cspan class\u003d\"tex-font-style-bf\"\u003egood\u003c/span\u003e: [1], [1, 2], [2], [2, -3], [-3]. However, the subarray [1, 2, -3] isn\u0027t \u003cspan class\u003d\"tex-font-style-bf\"\u003egood\u003c/span\u003e, as its subarray [1, 2, -3] has sum of elements equal to 0.\u003c/p\u003e\n\u003cp\u003eIn the second sample, three subarrays of size 1 are the only \u003cspan class\u003d\"tex-font-style-bf\"\u003egood\u003c/span\u003e subarrays. At the same time, the subarray [41, -41, 41] isn\u0027t \u003cspan class\u003d\"tex-font-style-bf\"\u003egood\u003c/span\u003e, as its subarray [41, -41] has sum of elements equal to 0.\u003c/p\u003e"}}]}