{"id":142,"date":"2021-01-01T15:58:00","date_gmt":"2021-01-01T15:58:00","guid":{"rendered":"https:\/\/imwarming.com\/?p=142"},"modified":"2021-01-01T15:58:00","modified_gmt":"2021-01-01T15:58:00","slug":"pta2021%e8%b7%a8%e5%b9%b4%e6%8c%91%e6%88%98%e8%b5%9b%e9%83%a8%e5%88%86%e9%a2%98%e8%a7%a3","status":"publish","type":"post","link":"https:\/\/imwarming.com\/?p=142","title":{"rendered":"PTA2021 \u8de8\u5e74\u6311\u6218\u8d5b\u90e8\u5206\u9898\u89e3"},"content":{"rendered":"

7-1 \u538b\u5c81\u94b1<\/p>\n

\u4e0d\u7528\u8bf4<\/p>\n

\n
#include<bits\/stdc++.h>\n\nusing<\/span> namespace<\/span> std;\ntypedef <\/span>long<\/span> long<\/span> ll;\n<\/span>const<\/span> int<\/span> maxn = 1e9;\n<\/span>const<\/span> int<\/span> maxm = 1e5 + 5<\/span>;\n<\/span>const<\/span> ll inf = 2147483647<\/span>;\n<\/span>using<\/span> namespace<\/span> std;\n\n<\/span>int<\/span> main() {\n    <\/span>int<\/span> a, b, c, d;\n    cin <\/span>>> a >> b >> c >> d;\n    <\/span>int<\/span> sum = a + b + c + d;\n    cout <\/span><< sum;\n    <\/span>return<\/span> 0<\/span>;\n}<\/span><\/pre>\n<\/div>\n
 <\/p>\n
7-2 \u5c04\u51fb\u6210\u7ee9<\/p>\n
\u5fae\u7c73\u8f6c\u6beb\u7c73\u6309\u73af\u5224\u65ad\u3002<\/p>\n
\n
#include<bits\/stdc++.h>\n\nusing<\/span> namespace<\/span> std;\ntypedef <\/span>long<\/span> long<\/span> ll;\n<\/span>const<\/span> int<\/span> maxn = 1e9;\n<\/span>const<\/span> int<\/span> maxm = 1e5 + 5<\/span>;\n<\/span>const<\/span> ll inf = 2147483647<\/span>;\n<\/span>using<\/span> namespace<\/span> std;\n\n<\/span>int<\/span> main() {\n    <\/span>double<\/span> n;\n    cin <\/span>>> n;\n    <\/span>if<\/span>(n <= 11500<\/span> \/ 2<\/span>)\n        cout<\/span><<10<\/span>;\n    <\/span>else<\/span> if<\/span>(n <= 27500<\/span> \/ 2<\/span>)\n        cout<\/span><<9<\/span>;\n    <\/span>else<\/span> if<\/span>(n <= 43500<\/span> \/ 2<\/span>)\n        cout<\/span><<8<\/span>;\n    <\/span>else<\/span> if<\/span>(n <= 59500<\/span> \/ 2<\/span>)\n        cout<\/span><<7<\/span>;\n    <\/span>else<\/span> if<\/span>(n <= 75500<\/span> \/ 2<\/span>)\n        cout<\/span><<6<\/span>;\n    <\/span>else<\/span> if<\/span>(n <= 91500<\/span> \/ 2<\/span>)\n        cout<\/span><<5<\/span>;\n    <\/span>else<\/span> if<\/span>(n <= 107500<\/span> \/ 2<\/span>)\n        cout<\/span><<4<\/span>;\n    <\/span>else<\/span> if<\/span>(n <= 123500<\/span> \/ 2<\/span>)\n        cout<\/span><<3<\/span>;\n    <\/span>else<\/span> if<\/span>(n <= 139500<\/span> \/ 2<\/span>)\n        cout<\/span><<2<\/span>;\n    <\/span>else<\/span> if<\/span>(n <= 155500<\/span> \/ 2<\/span>)\n        cout<\/span><<1<\/span>;\n    <\/span>else<\/span> cout<<0<\/span>;\n    <\/span>return<\/span> 0<\/span>;\n}<\/span><\/pre>\n<\/div>\n
 <\/p>\n
7-3 cassels\u65b9\u7a0b<\/p>\n
\u4e0d\u7528\u8bf4<\/p>\n
\n
#include<bits\/stdc++.h>\n\nusing<\/span> namespace<\/span> std;\ntypedef <\/span>long<\/span> long<\/span> ll;\n<\/span>const<\/span> int<\/span> maxn = 1e9;\n<\/span>const<\/span> int<\/span> maxm = 1e5 + 5<\/span>;\n<\/span>const<\/span> ll inf = 2147483647<\/span>;\n<\/span>using<\/span> namespace<\/span> std;\n\n<\/span>int<\/span> main() {\n    <\/span>int<\/span> n;\n    cin <\/span>>> n;\n    <\/span>while<\/span> (n--) {\n        <\/span>int<\/span> x, y, z;\n        cin <\/span>>> x >> y >> z;\n        <\/span>if<\/span> (x * x + y * y + z * z != 3<\/span> * x * y * z)\n            cout <\/span><< \"<\/span>no<\/span>\"<\/span> << endl;\n        <\/span>else<\/span> cout << \"<\/span>yes<\/span>\"<\/span> << endl;\n    }\n    <\/span>return<\/span> 0<\/span>;\n}<\/span><\/pre>\n<\/div>\n
 <\/p>\n
7-4 \u76f8\u751f\u76f8\u514b<\/p>\n
\u6839\u636e\u9898\u610f\u76f8\u751f\u76f8\u514b\u7684\u6570\u5b57\u548c\u5224\u65ad\uff0c\u4e5f\u53ef\u4ee5\u76f4\u63a5\u4ece\u91d1\u5230\u571f\u7684\u6570\u5b57\u770b\u53e6\u4e00\u4e2a\u6570\u5b57\u662f\u5565\u5224\u65ad\u76f8\u751f\u8fd8\u662f\u76f8\u514b\uff0c\u56e0\u4e3a\u76f8\u751f\u76f8\u514b\u90fd\u662f\u4e00\u5bf9\u4e00\u7684\u3002<\/p>\n
\n
#include<bits\/stdc++.h>\n\nusing<\/span> namespace<\/span> std;\ntypedef <\/span>long<\/span> long<\/span> ll;\n<\/span>const<\/span> int<\/span> maxn = 1e9;\n<\/span>const<\/span> int<\/span> maxm = 1e5 + 5<\/span>;\n<\/span>const<\/span> ll inf = 2147483647<\/span>;\n<\/span>using<\/span> namespace<\/span> std;\n\n<\/span>void<\/span> judeg(int<\/span> a, int<\/span> b) {\n    <\/span>int<\/span> sum = a + b;\n    <\/span>if<\/span> (sum == 3<\/span>)\n        cout <\/span><< \"<\/span>1 ke 2n<\/span>\"<\/span>;\n    <\/span>else<\/span> if<\/span> (sum == 7<\/span>) {\n        <\/span>if<\/span> (a == 2<\/span> || a == 5<\/span>)\n            cout <\/span><< \"<\/span>2 ke 5n<\/span>\"<\/span>;\n        <\/span>else<\/span> cout << \"<\/span>3 ke 4n<\/span>\"<\/span>;\n    } <\/span>else<\/span> if<\/span> (sum == 8<\/span>)\n        cout <\/span><< \"<\/span>5 ke 3n<\/span>\"<\/span>;\n    <\/span>else<\/span> if<\/span> (sum == 5<\/span>) {\n        <\/span>if<\/span> (a == 4<\/span> || a == 1<\/span>)\n            cout <\/span><< \"<\/span>4 ke 1n<\/span>\"<\/span>;\n        <\/span>else<\/span> cout << \"<\/span>3 sheng 2n<\/span>\"<\/span>;\n    } <\/span>else<\/span> if<\/span> (sum == 6<\/span>) {\n        <\/span>if<\/span> (a == 2<\/span> || a == 4<\/span>) {\n            cout <\/span><< \"<\/span>2 sheng 4n<\/span>\"<\/span>;\n        } <\/span>else<\/span> cout << \"<\/span>5 sheng 1n<\/span>\"<\/span>;\n    } <\/span>else<\/span> if<\/span> (sum == 9<\/span>)\n        cout <\/span><< \"<\/span>4 sheng 5n<\/span>\"<\/span>;\n    <\/span>else<\/span> if<\/span> (a == 1<\/span> || a == 3<\/span>)\n        cout <\/span><< \"<\/span>1 sheng 3n<\/span>\"<\/span>;\n}\n\n<\/span>int<\/span> main() {\n    <\/span>int<\/span> n;\n    cin <\/span>>> n;\n    <\/span>while<\/span> (n--) {\n        <\/span>int<\/span> x, y;\n        cin <\/span>>> x >> y;\n        judeg(x, y);\n    }\n    <\/span>return<\/span> 0<\/span>;\n}<\/span><\/pre>\n<\/div>\n
 <\/p>\n
7-5 7-6\u592a\u83dc\u4e86\u6ca1\u8fc7<\/p>\n
\"\" <\/p>\n
7-5 \u6574\u9664\u9636\u4e58<\/p>\n
\u5bf9\u4e8e\u6bcf\u4e2a\u6570\uff0c\u76f4\u63a5\u628an * n + 1\u5bf9n!\u7684\u5404\u4e58\u56e0\u5b50\u6c42\u4f59\uff0c\u6700\u540e\u5224\u65adn * n + 1\u662f\u5426\u53d8\u62101\u6765\u8f93\u51fa\u7ed3\u679c\uff0c\u7528f\u505a\u662f\u5426\u6709\u7ed3\u679c\u6807\u8bb0\uff0c\u5982\u679c\u6ca1\u6709\u5c31\u8f93\u51fanone\u3002\u6765\u81ea\uff1acsdn<\/a><\/p>\n
\n
#include<bits\/stdc++.h>\n\nusing<\/span> namespace<\/span> std;\ntypedef <\/span>long<\/span> long<\/span> ll;\n<\/span>const<\/span> int<\/span> maxn = 1e9;\n<\/span>const<\/span> int<\/span> maxm = 1e5 + 5<\/span>;\n<\/span>const<\/span> ll inf = 2147483647<\/span>;\n<\/span>using<\/span> namespace<\/span> std;\n\n<\/span>int<\/span> main() {\n    <\/span>int<\/span> n, m, f = 0<\/span>;\n    cin <\/span>>> n >> m;\n    <\/span>for<\/span> (int<\/span> i = n; i <= m; i++) {\n        <\/span>int<\/span> sum = i * i + 1<\/span>;\n        <\/span>for<\/span> (int<\/span> j = 2<\/span>; j <= i; j++) {\n            <\/span>if<\/span> (sum >= j && sum % j == 0<\/span>)\n                sum <\/span>\/= j;\n            <\/span>else<\/span> if<\/span> (sum < j && j % sum == 0<\/span>)\n                sum <\/span>= 1<\/span>;\n        }\n        <\/span>if<\/span> (sum == 1<\/span>) {\n            cout <\/span><< i << endl;\n            f <\/span>= 1<\/span>;\n        }\n    }\n    <\/span>if<\/span> (!f)cout << \"<\/span>none<\/span>\"<\/span>;\n    <\/span>return<\/span> 0<\/span>;\n}<\/span><\/pre>\n<\/div>\n
 <\/p>\n
7-7 \u6253pta <\/p>\n
\u5148\u5224\u65ad\u6700\u540e\u4e00\u4e2a\u5b57\u7b26\u662f\u5426\u662f\uff1f\uff0c\u4e0d\u662f\u76f4\u63a5\u8f93\u51faenen\uff0c\u662f\u5c31\u4ece\u4e0b\u68072\u5f00\u59cb\u5224\u65ad\u6b64\u4e0b\u6807\u662f\u5426\u662f\u5b57\u7b26a\u548c\u524d\u9762\u4e24\u4e2a\u5b57\u7b26\u662f\u5426\u662ft\u548cp\uff0c\u662f\u7684\u8bdd\u5c31\u628aflag f\u8bbe\u4e3a\u771f\uff0cf\u9ed8\u8ba4\u4e3a\u5047\uff0c\u518d\u6839\u636ef\u7684\u771f\u5047\u8f93\u51fa\u7ed3\u679c\u3002<\/p>\n
\n
#include<bits\/stdc++.h>\n\nusing<\/span> namespace<\/span> std;\ntypedef <\/span>long<\/span> long<\/span> ll;\n<\/span>const<\/span> int<\/span> maxn = 1e9;\n<\/span>const<\/span> int<\/span> maxm = 1e5 + 5<\/span>;\n<\/span>const<\/span> ll inf = 2147483647<\/span>;\n<\/span>using<\/span> namespace<\/span> std;\n\n<\/span>int<\/span> main() {\n    <\/span>int<\/span> n;\n    cin <\/span>>> n;\n    <\/span>for<\/span> (int<\/span> j = 0<\/span>; j < n; j++) {\n        <\/span>string<\/span> s;\n        <\/span>if<\/span> (j == 0<\/span>)\n            getchar();\n        getline(cin, s);\n        <\/span>int<\/span> t = s.length();\n        <\/span>int<\/span> f = 0<\/span>;\n        <\/span>if<\/span> (s[t - 1<\/span>] != '<\/span>?<\/span>'<\/span>) {\n            cout <\/span><< \"<\/span>enenn<\/span>\"<\/span>;\n        } <\/span>else<\/span> {\n            <\/span>for<\/span> (int<\/span> i = 2<\/span>; i < t; i++) {\n                <\/span>if<\/span> (s[i] == '<\/span>a<\/span>'<\/span> && s[i - 1<\/span>] == '<\/span>t<\/span>'<\/span> && s[i - 2<\/span>] == '<\/span>p<\/span>'<\/span>) {\n                    f <\/span>= 1<\/span>;\n                    <\/span>break<\/span>;\n                }\n            }\n            <\/span>if<\/span> (f)\n                cout <\/span><< \"<\/span>yes!n<\/span>\"<\/span>;\n            <\/span>else<\/span> cout << \"<\/span>no.n<\/span>\"<\/span>;\n        }\n    }\n    <\/span>return<\/span> 0<\/span>;\n}<\/span><\/pre>\n<\/div>\n
 <\/p>\n
7-8 \u5b8c\u7f8e\u5bf9\u79f0<\/p>\n
\u4ece\u5934\u5230\u5c3e\u5f00\u59cb\u5224\u65ad\u533a\u95f4\u662f\u5426\u5bf9\u79f0\uff0c\u4e0d\u5bf9\u79f0\u5934\u5c31\u987a\u79fb\u5230\u4e0b\u4e00\u4f4d\u76f4\u5230\u627e\u5230\u5bf9\u79f0\u533a\u95f4\uff0c\u5f53\u5934\u7b49\u4e8e\u7b2c\u4e00\u4f4d\u65f6\u5c31\u76f4\u63a5\u5b8c\u6574\u8f93\u51fa\uff0c\u4e0d\u662f\u65f6\u5012\u5e8f\u8f93\u51fa\u5934\u524d\u9762\u533a\u95f4\u3002<\/p>\n
\n
#include<bits\/stdc++.h>\n\nusing<\/span> namespace<\/span> std;\ntypedef <\/span>long<\/span> long<\/span> ll;\n<\/span>const<\/span> int<\/span> maxn = 1e9;\n<\/span>const<\/span> int<\/span> maxm = 1e5 + 5<\/span>;\n<\/span>const<\/span> ll inf = 2147483647<\/span>;\n<\/span>using<\/span> namespace<\/span> std;\n\n<\/span>int<\/span> main() {\n    <\/span>int<\/span> n;\n    cin <\/span>>> n;\n    vector<\/span><int<\/span>> v(n + 1<\/span>);\n    <\/span>for<\/span> (int<\/span> i = 1<\/span>; i <= n; i++) {\n        cin <\/span>>> v[i];\n    }\n    <\/span>for<\/span> (int<\/span> i = 1<\/span>; i <= n; i++) {\n        <\/span>int<\/span> k = n, j = i, f = 1<\/span>;\n        <\/span>while<\/span> (k >= j) {\/\/<\/span>\u8fd9\u91cc\u5224\u65ad\u662f\u5426\u5bf9\u79f0<\/span>\n            if<\/span> (v[k] != v[j]) {\n                f <\/span>= 0<\/span>;\n                <\/span>break<\/span>;\n            }\n            k<\/span>--;\n            j<\/span>++;\n        }\n        <\/span>if<\/span> (f && i != 1<\/span>) {\n            cout <\/span><< v[i - 1<\/span>];\n            <\/span>for<\/span> (int<\/span> p = i - 2<\/span>; p >= 1<\/span>; p--) {\n                cout <\/span><< '<\/span> '<\/span> << v[p];\n            }\n            <\/span>break<\/span>;\n        } <\/span>else<\/span> if<\/span> (f) {\n            cout <\/span><< v[1<\/span>];\n            <\/span>for<\/span> (int<\/span> p = 2<\/span>; p <= n; p++) {\n                cout <\/span><< '<\/span> '<\/span> << v[p];\n            }\n            <\/span>break<\/span>;\n        }\n    }\n    <\/span>return<\/span> 0<\/span>;\n}<\/span><\/pre>\n<\/div>\n
 <\/p>\n","protected":false},"excerpt":{"rendered":"
7-1 \u538b\u5c81\u94b1 \u4e0d\u7528\u8bf4 #include<bits\/stdc++.h> usi […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-142","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\nPTA2021 \u8de8\u5e74\u6311\u6218\u8d5b\u90e8\u5206\u9898\u89e3 - imwarming<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/imwarming.com\/?p=142\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"PTA2021 \u8de8\u5e74\u6311\u6218\u8d5b\u90e8\u5206\u9898\u89e3 - imwarming\" \/>\n<meta property=\"og:description\" content=\"7-1 \u538b\u5c81\u94b1 \u4e0d\u7528\u8bf4 #include<bits\/stdc++.h> usi […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/imwarming.com\/?p=142\" \/>\n<meta property=\"og:site_name\" content=\"imwarming\" \/>\n<meta property=\"article:published_time\" content=\"2021-01-01T15:58:00+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/img2020.cnblogs.com\/blog\/1634852\/202101\/1634852-20210101235727829-999410874.png\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u4f5c\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"warming\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 \u5206\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebSite\",\"@id\":\"https:\/\/imwarming.com\/#website\",\"url\":\"https:\/\/imwarming.com\/\",\"name\":\"imwarming\",\"description\":\"\u6c38\u8fdc\u5e74\u8f7b\uff0c\u6c38\u8fdc\u70ed\u6cea\u76c8\u7736\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/imwarming.com\/?s={search_term_string}\"},\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"zh-Hans\"},{\"@type\":\"ImageObject\",\"@id\":\"https:\/\/imwarming.com\/?p=142#primaryimage\",\"inLanguage\":\"zh-Hans\",\"url\":\"https:\/\/img2020.cnblogs.com\/blog\/1634852\/202101\/1634852-20210101235727829-999410874.png\",\"contentUrl\":\"https:\/\/img2020.cnblogs.com\/blog\/1634852\/202101\/1634852-20210101235727829-999410874.png\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/imwarming.com\/?p=142#webpage\",\"url\":\"https:\/\/imwarming.com\/?p=142\",\"name\":\"PTA2021 \u8de8\u5e74\u6311\u6218\u8d5b\u90e8\u5206\u9898\u89e3 - 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