{"trustable":true,"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$$\u0027]]\n }\n });\n\u003c/script\u003e\n\u003cscript type\u003d\"text/javascript\" async src\u003d\"https://mathjax.codeforces.org/MathJax.js?config\u003dTeX-AMS_HTML-full\"\u003e\u003c/script\u003e","sections":[{"title":"","value":{"format":"HTML","content":"\u003cp\u003eEugene likes working with arrays. And today he needs your help in solving one challenging task.\u003c/p\u003e\u003cp\u003eAn array $$$c$$$ is a subarray of an array $$$b$$$ if $$$c$$$ can be obtained from $$$b$$$ by deletion of several (possibly, zero or all) elements from the beginning and several (possibly, zero or all) elements from the end.\u003c/p\u003e\u003cp\u003eLet\u0027s call a nonempty array \u003cspan class\u003d\"tex-font-style-bf\"\u003egood\u003c/span\u003e if for every nonempty subarray of this array, sum of the elements of this subarray is nonzero. For example, array $$$[-1, 2, -3]$$$ is \u003cspan class\u003d\"tex-font-style-bf\"\u003egood\u003c/span\u003e, as all arrays $$$[-1]$$$, $$$[-1, 2]$$$, $$$[-1, 2, -3]$$$, $$$[2]$$$, $$$[2, -3]$$$, $$$[-3]$$$ have nonzero sums of elements. However, array $$$[-1, 2, -1, -3]$$$ isn\u0027t \u003cspan class\u003d\"tex-font-style-bf\"\u003egood\u003c/span\u003e, as his subarray $$$[-1, 2, -1]$$$ has sum of elements equal to $$$0$$$.\u003c/p\u003e\u003cp\u003eHelp Eugene to calculate the number of nonempty \u003cspan class\u003d\"tex-font-style-bf\"\u003egood\u003c/span\u003e subarrays of a given array $$$a$$$.\u003c/p\u003e"}},{"title":"Input","value":{"format":"HTML","content":"\u003cp\u003eThe first line of the input contains a single integer $$$n$$$ ($$$1 \\le n \\le 2 \\times 10^5$$$) \u0026nbsp;— the length of array $$$a$$$.\u003c/p\u003e\u003cp\u003eThe second line of the input contains $$$n$$$ integers $$$a_1, a_2, \\dots, a_n$$$ ($$$-10^9 \\le a_i \\le 10^9$$$) \u0026nbsp;— the elements of $$$a$$$. \u003c/p\u003e"}},{"title":"Output","value":{"format":"HTML","content":"\u003cp\u003eOutput a single integer \u0026nbsp;— the number of \u003cspan class\u003d\"tex-font-style-bf\"\u003egood\u003c/span\u003e subarrays of $$$a$$$.\u003c/p\u003e"}},{"title":"Examples","value":{"format":"HTML","content":"\u003ctable class\u003d\u0027vjudge_sample\u0027\u003e\n\u003cthead\u003e\n \u003ctr\u003e\n \u003cth\u003eInput\u003c/th\u003e\n \u003cth\u003eOutput\u003c/th\u003e\n \u003c/tr\u003e\n\u003c/thead\u003e\n\u003ctbody\u003e\n \u003ctr\u003e\n \u003ctd\u003e\u003cpre\u003e3\n1 2 -3\n\u003c/pre\u003e\u003c/td\u003e\n \u003ctd\u003e\u003cpre\u003e5\n\u003c/pre\u003e\u003c/td\u003e\n \u003c/tr\u003e\n\u003c/tbody\u003e\n\u003c/table\u003e\n"}},{"title":"","value":{"format":"HTML","content":"\u003ctable class\u003d\u0027vjudge_sample\u0027\u003e\n\u003cthead\u003e\n \u003ctr\u003e\n \u003cth\u003eInput\u003c/th\u003e\n \u003cth\u003eOutput\u003c/th\u003e\n \u003c/tr\u003e\n\u003c/thead\u003e\n\u003ctbody\u003e\n \u003ctr\u003e\n \u003ctd\u003e\u003cpre\u003e3\n41 -41 41\n\u003c/pre\u003e\u003c/td\u003e\n \u003ctd\u003e\u003cpre\u003e3\n\u003c/pre\u003e\u003c/td\u003e\n \u003c/tr\u003e\n\u003c/tbody\u003e\n\u003c/table\u003e\n"}},{"title":"Note","value":{"format":"HTML","content":"\u003cp\u003eIn the first sample, the following subarrays are \u003cspan class\u003d\"tex-font-style-bf\"\u003egood\u003c/span\u003e: $$$[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$$$.\u003c/p\u003e\u003cp\u003eIn the second sample, three subarrays of size 1 are the only \u003cspan class\u003d\"tex-font-style-bf\"\u003egood\u003c/span\u003e subarrays. At the same time, the subarray $$$[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"}}]}