{"id":127,"date":"2010-02-24T13:46:00","date_gmt":"2010-02-24T05:46:00","guid":{"rendered":"http:\/\/localhost\/?p=127"},"modified":"2010-02-24T13:46:00","modified_gmt":"2010-02-24T05:46:00","slug":"sgu_417","status":"publish","type":"post","link":"https:\/\/www.shuizilong.com\/wjmzbmr\/?p=127","title":{"rendered":"SGU 417"},"content":{"rendered":"\n

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ln(x^2+y^2)\u4e0d\u5c31\u662f2ln(\u5706\u70b9\u5230\u8be5\u70b9\u7684\u8ddd\u79bb\u4e48)\u3002\u3002\u8fd9\u4e2a\u8fd9\u4e2a\u3002\u3002\u6ca1\u60f3\u6cd5\u3002\u3002<\/p>\n

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Code\uff1a<\/p>\n

#include<cstdio>#include<iostream>#include<algorithm>#include<string>#include<vector>#include<cmath>#define rep(i,n) for(int i=0;i<n;i++)using namespace std;int main(){ \/\/freopen("in","r",stdin); double p=acos(0)*2;int x,y,r;cin>>x>>y>>r; double ans=log(x*x+y*y)*r*r*p; printf("%0.15lfn",ans);}\u672c\u9ad8\u4eae\u4ee3\u7801\u4f7f\u7528codeHl\u751f\u6210\uff0c\u67e5\u770b\u8be6\u60c5<\/a> <\/p>\n","protected":false},"excerpt":{"rendered":"

\u3002\u3002\u3002\u8fd9\u662f\u7f16\u7a0b\u9898\u4e48\u3002\u3002\u660e\u660e\u662fBT\u7eaf\u9ad8\u7b49\u6570\u5b66\u9898\u3002\u3002 \u5c31\u662f\u8bf4\u6bcf\u4e2a\u70b9\u7684\u5bc6\u5ea6\u51fd\u6570\u662fln(x^2+y^2)\u3002\u3002\u7136\u540e\u7ed9\u4f60\u4e00\u4e2a\u8ddf\u539f\u70b9\u4e0d\u60f3\u4ea4\u7684\u5706\uff0c\u7136\u4f60\u6c42\u8fd9\u4e2a\u5706\u7684\u91cd\u91cf\u3002 ln(x^2+y^2)\u4e0d\u5c31\u662f2ln(\u5706\u70b9\u5230\u8be5\u70b9\u7684\u8ddd\u79bb\u4e48)\u3002\u3002\u8fd9\u4e2a\u8fd9\u4e2a\u3002\u3002\u6ca1\u60f3\u6cd5\u3002\u3002 \u600e\u4e48\u529e\u554a\u3002\u3002\u6211\u66b4\u529b\u79ef\u5206\u4e86\u534a\u5929\u3002\u8111\u5b50\u90fd\u5927\u4e86\u3002\u3002\u53ea\u597d\u627e\u89c4\u5f8b\u3002\u3002\u6211\u5f04\u4e86\u4e00\u5806\u6570\u636e\u3002\u3002 \u7136\u540e\u6211\u9707\u7cbe\u4e86\u3002\u3002\u7b54\u6848\u5c31\u662f\u5706\u5fc3\u7684\u5bc6\u5ea6\u7684\u4e58\u4ee5\u5706\u7684\u9762\u79ef\u3002\u3002 \u6211\u4e5f\u4e0d\u77e5\u9053\u4e3a\u4ec0\u4e48 \u603b\u7ed3\u5c31\u662f\u770b\u5230\u8fd9\u79cd\u9898\u7b97\u6bdb\u554a\u3002\u3002\u76f4\u63a5\u627e\u89c4\u5f8b\u3002\u3002AC\u5c31\u662f\u786c\u9053\u7406\uff01 Code\uff1a #include<cstdio>#include<iostream>#include<algorithm>#include<string>#include<vector>#include<cmath>#define rep(i,n) for(int i=0;i<n;i++)using namespace std;int main(){ \/\/freopen("in","r",stdin); double p=acos(0)*2;int x,y,r;cin>>x>>y>>r; double ans=log(x*x+y*y)*r*r*p; printf("%0.15lfn",ans);}\u672c\u9ad8\u4eae\u4ee3\u7801\u4f7f\u7528codeHl\u751f\u6210\uff0c\u67e5\u770b\u8be6\u60c5<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[10],"tags":[],"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/www.shuizilong.com\/wjmzbmr\/index.php?rest_route=\/wp\/v2\/posts\/127"}],"collection":[{"href":"https:\/\/www.shuizilong.com\/wjmzbmr\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.shuizilong.com\/wjmzbmr\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.shuizilong.com\/wjmzbmr\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.shuizilong.com\/wjmzbmr\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=127"}],"version-history":[{"count":0,"href":"https:\/\/www.shuizilong.com\/wjmzbmr\/index.php?rest_route=\/wp\/v2\/posts\/127\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.shuizilong.com\/wjmzbmr\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=127"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.shuizilong.com\/wjmzbmr\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=127"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.shuizilong.com\/wjmzbmr\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=127"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}