{"id":287,"date":"2012-11-24T13:25:00","date_gmt":"2012-11-24T05:25:00","guid":{"rendered":"http:\/\/nike0good.jp1.rpvhost.net\/192"},"modified":"2012-11-24T13:25:00","modified_gmt":"2012-11-24T05:25:00","slug":"poj_3171_covering_a_minimum_price_range","status":"publish","type":"post","link":"https:\/\/nike0good.com\/?p=287","title":{"rendered":"POJ 3171(\u533a\u95f4\u8986\u76d6\u6700\u5c0f\u4ee3\u4ef7\uff09"},"content":{"rendered":"\n\n\n
\n
Language:\n\n\n\n
Time Limit:<\/strong> 1000MS<\/td>\n <\/td>\nMemory Limit:<\/strong> 65536K<\/td>\n<\/tr>\n
Total Submissions:<\/strong> 2093<\/td>\n <\/td>\nAccepted:<\/strong> 735<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

\nDescription<\/p>\n

\n\u6709N (1 <= N <= 10,000)\u4e2a\u533a\u95f4\uff0c\u6c42\u8986\u76d6[M,E](0 <= M <= E <= 86,399)\u7684\u6700\u5c0f\u4ee3\u4ef7.
\n\u6bcf\u4e2a\u533a\u95f4\u7684\u4ee3\u4ef7\u4e3aS (where 0 <= S <= 500,000).<\/p>\n<\/div>\n

\nInput<\/p>\n

\n\u7b2c\u4e00\u884c3\u4e2a\u6574\u6570: N, M, E. <\/p>\n

\u7b2c\u4e8c\u884c\u5230\u7b2cn+1\u884c\uff0c\u6bcf\u884c3\u4e2a\u6570\uff0c\u5206\u522b\u8868\u793a\u7b2ci-1\u4e2a\u533a\u95f4\u7684\u5de6\u7aef\u70b9T1,\u53f3\u7aef\u70b9T2,\u548c\u4ee3\u4ef7S.<\/p><\/div>\n

\nOutput<\/p>\n

\n\u4ec5\u4e00\u884c\u8868\u793a\u6700\u5c0f\u4ee3\u4ef7\uff0c\u65e0\u89e3\u8f93-1.<\/div>\n

\nSample Input<\/p>\n

3 0 4\n0 2 3\n3 4 2\n0 0 1<\/pre>\n
\nSample Output<\/p>\n
5<\/pre>\n
\nHint<\/p>\n
\n\u6837\u4f8b\u89e3\u91ca
\n\u53d6\u7b2c\u4e00\u4e2a\u548c\u7b2c\u4e8c\u4e2a\u533a\u95f4\u3002<\/div>\n
\nSource<\/p>\n
\nUSACO 2005 December Silver<\/a><\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
<\/span>\u8fd9\u9898\u662f\u4e00\u4e2aDp\u95ee\u9898\uff0c\u5148\u5217\u51faDp\u65b9\u7a0b\u3002
\nF[i]\u8868\u793a\u53d6[M,i]\u8fd9\u4e2a\u533a\u95f4\u7684\u4ee3\u4ef7
\n\u663e\u7136F[M-1]=0,\u7b54\u6848\u5c31\u662fF[E]
\n\u5219\u65b9\u7a0b\u4e3aF[a[i].T2]=min(F[j])+a[i].S (T1-1<=J<=T2-1)
\na[i]\u6309T2\u4ece\u5c0f\u5230\u5927\u6392\u5217\uff1b
\n\u90a3\u4e48\u663e\u7136a[i]\u53d6\u65f6\uff0c[M,T1-1]\u5df2\u7ecf\u88ab\u524d\u9762\u7684\u7ed9\u53d6\u4e86\uff0c
\n\u56e0\u4e3a\u5982\u679c\u88ab\u540e\u9762\u7684[t1,t2] \u53d6\u4e86,\u90a3\u4e48\u5fc5\u6709t1<T1 T2<t2\uff0c \u5c31\u6ca1\u5fc5\u8981\u53d6[T1,T2]\u4e86\u3002<\/p>\n
<\/span><\/p>\n
\u53d6\u6700\u5c0f\u7684\u6570\u53ef\u4ee5\u7528\u7ebf\u6bb5\u6811\u505aO(NlogN)\u3002<\/span><\/p>\n

\n<\/span><\/p>\n
<\/span><\/p>\n
#include<cstdio>\n#include<cstring>\n#include<cstdlib>\n#include<cmath>\n#include<cctype>\n#include<iostream>\n#include<functional>\n#include<algorithm>\nusing namespace std;\n#define MAXN (10000+10)\n#define MAXE (86399)\n#define MAXS (500000+10)\n#define INF (9187201950435737471)\nint n,s,e;\nstruct SegMent\n{\n\tint l,r;\n\tlong long S;\n\tSegMent(){}\n\tSegMent(int _l,int _r,long long _S):l(_l),r(_r),S(_S){}\n\tfriend bool operator<(const SegMent a,const SegMent b){return a.r<b.r;}\n}a[MAXN];\nstruct SegMentTree \/\/min()\n{\n\tint n,M;\n\tlong long t[MAXE*10];\n\tvoid fillchar(int _n)\n\t{\n\t\tn=_n+2;\n\t\tM=1;while (M-2<n) M<<=1;\n\t\tmemset(t,127,sizeof(t));\n\t}\n\tvoid update(int x)\n\t{\n\t\tfor (x>>=1;x;x>>=1) t[x]=min(t[x<<1],t[(x<<1)^1]);\n\t}\n\tvoid insert(int x,long long c)\n\t{\n\t\tx=x+2;\n\t\tx+=M;\n\t\tif (t[x]>c) {t[x]=c; update(x);\t}\n\t}\n\tlong long find(int l,int r)\n\t{\n\t\tl=l+2;r=r+2;\n\n\t\tl=l-1+M;r=r+1+M;\n\t\tlong long ans=INF;\n\t\twhile (l^r^1)\n\t\t{\n\t\t\tif (~l&1) ans=min(ans,t[l+1]);\n\t\t\tif (r&1) ans=min(ans,t[r-1]);\n\t\t\tl>>=1;r>>=1;\n\t\t}\n\t\treturn ans;\n\t}\n}t;\nint main()\n{\n\/\/\tfreopen("poj3171.in","r",stdin);\n\tscanf("%d%d%d",&n,&s,&e);\n\tfor (int i=1;i<=n;i++) scanf("%d%d%d",&a[i].l,&a[i].r,&a[i].S);\n\tsort(a+1,a+1+n);\n\tt.fillchar(e);\n\tt.insert(s-1,0);\n\tfor (int i=1;i<=n;i++)\n\t{\n\t\tif (a[i].r<s) continue;\n\t\tt.insert(a[i].r,t.find(max(s-1,a[i].l-1),a[i].r-1)+a[i].S);\n\t}\n\/*\tfor (int i=t.M;i<=t.M*2;i++) cout<<t.t[i]<<' ';\n\tcout<<endl;\n*\/\tif (t.t[e+2+t.M]==INF) cout<<"-1n";\n\telse cout<<t.t[e+2+t.M]<<endl;\n\n\n\treturn 0;\n}<\/pre>\n<\/p>\n
<\/p>\n","protected":false},"excerpt":{"rendered":"
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