{"id":106,"date":"2025-01-11T23:32:30","date_gmt":"2025-01-11T15:32:30","guid":{"rendered":"http:\/\/150.230.63.147\/blog\/?p=106"},"modified":"2025-01-11T23:32:30","modified_gmt":"2025-01-11T15:32:30","slug":"c1-pokemon-army-easy-version-%e8%a7%a3%e6%9e%90dp","status":"publish","type":"post","link":"https:\/\/blog.seekrealthing.net\/blog\/?p=106","title":{"rendered":"C1. Pok\u00e9mon Army (easy version) \u89e3\u6790(DP)"},"content":{"rendered":"\n

Codeforce 1420 C1. Pok\u00e9mon Army (easy version) \u89e3\u6790(DP)<\/h1>\n

\u4eca\u5929\u6211\u5011\u4f86\u770b\u770bCF1420C1
\n\u984c\u76ee\u9023\u7d50<\/a><\/p>\n

\n

\u984c\u76ee<\/strong>
\n\u5c0d\u65bc\u4e00\u500b\u6578\u5217$a$\uff0c\u9078\u82e5\u5e72\u500b\u6578\u5b57\uff0c\u6c42alternating-series<\/strong>\u7684\u6700\u5927\u503c\u3002<\/p>\n<\/blockquote>\n

\u524d\u8a00<\/h3>\n

C2\u771f\u7684\u60f3\u4e0d\u5230<\/p>\n

\u60f3\u6cd5<\/h3>\n

$dp[i][0]$\u4ee3\u8868:\u8003\u616e\u5230\u7b2ci\u500b\u6578\u5b57\u70ba\u6b62\uff0c\u6700\u5f8c\u4e00\u500b\u6578\u5b57\u662f\u8ca0\u7684\u7684\u6700\u5927\u503c
\n$dp[i][1]$\u4ee3\u8868:\u8003\u616e\u5230\u7b2ci\u500b\u6578\u5b57\u70ba\u6b62\uff0c\u6700\u5f8c\u4e00\u500b\u6578\u5b57\u662f\u6b63\u7684\u7684\u6700\u5927\u503c
\n$dp[i][0]=max{dp[i-1][0],dp[i-1][1]-a[i]}$
\n$dp[i][1]=max{dp[i-1][1],dp[i-1][0]+a[i],a[i]}$
\n\u8a18\u5f97\u4ee4$dp[0][0]$\u70ba\u6975\u5c0f\u503c\uff0c\u4e14\u7b54\u6848\u8981\u958b$long\\ long$
\n\u7b54\u6848\u662f$max{dp[n-1][0],dp[n-1][1])}$<\/p>\n

\u7a0b\u5f0f\u78bc:<\/h3>\n
const int _n=3e5+10;  \nint t,n,q,a[_n],l,r,dp[_n][2];  \nmain(void) {ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);  \n  cin>>t;while(t--){  \n    cin>>n>>q;rep(i,0,n)cin>>a[i];ll ans=0;  \n    rep(i,0,n)dp[i][0]=dp[i][1]=0;  \n    dp[0][0]=-1e5,dp[0][1]=a[0];  \n    rep(i,1,n){  \n      dp[i][0]=max(dp[i-1][0],dp[i-1][1]-a[i]);  \n      dp[i][1]=max(dp[i-1][1],max(dp[i-1][0]+a[i],a[i]));  \n    }cout<<max(dp[n-1][0],dp[n-1][1])<<'\\n';  \n  }  \n  return 0;  \n}  \n<\/code><\/pre>\n
\u6a19\u982d\u3001\u6a21\u677f\u8acb\u9edeSubmission\u770b
\nSubmission<\/a><\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","enabled":false},"version":2}},"categories":[3],"tags":[10,4,9],"class_list":["post-106","post","type-post","status-publish","format-standard","hentry","category-ojcode","tag-codeforce","tag-dp","tag-ojcode"],"jetpack_publicize_connections":[],"yoast_head":"\nC1. 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