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# holstein

【题目描述】

Healthy Holsteins
Burch & Kolstad Farmer John prides himself on having the healthiest dairy(乳品的) cows in the world. He knows the vitamin(维生素) content for one scoop(勺) of each feed type and the minimum(最小的) daily vitamin requirement for the cows. Help Farmer John feed his cows so they stay healthy while minimizing(使减到最少) the number of scoops that a cow is fed. Given the daily requirements of each kind of vitamin that a cow needs, identify(确定) the smallest combination(结合) of scoops of feed a cow can be fed in order to meet at least the minimum vitamin requirements. Vitamins are measured in integer(整数) units. Cows can be fed at most one scoop of any feed type. It is guaranteed(保证) that a solution(解决方案) exists for all contest(竞赛) input(投入) data. 【我的思路】 DFS 把所有的情况枚举一遍，按照组合数的搜索方法。 【code】 { ID:yxy07015 PROG:holstein LANG:PASCAL } var n,m,i,j,v,min:integer; a:array[1..25] of integer; b,minb:array[0..15] of integer; map:array[1..15,1..25] of integer; function check:boolean; begin for v:=1 to n do if a[v]>0 then exit(false); exit(true); end; procedure dfs(k:integer); var i:integer; begin if check then begin if k-1<min then begin min:=k-1; minb:=b; end; end else for i:=b[k-1]+1 to m do begin

b[k]:=i; for j:=1 to n do dec(a[j],map[i,j]); dfs(k+1); b[k]:=0; for j:=1 to n do inc(a[j],map[i,j]); end; end; begin assign(input,'holstein.in'); reset(input); assign(output,'holstein.out'); rewrite(output); readln(n); for i:=1 to n do read(a[i]); readln(m); for i:=1 to m do for j:=1 to n do read(map[i,j]); min:=\$7f; b[0]:=0; dfs(1); write(min,' '); for v:=1 to min-1 do write(minb[v],' '); writeln(minb[min]); close(input); close(output); end. Executing... Test 1: TEST OK [0.003 secs, 276 KB] Test 2: TEST OK [0.003 secs, 276 KB] Test 3: TEST OK [0.000 secs, 276 KB] Test 4: TEST OK [0.003 secs, 276 KB] Test 5: TEST OK [0.000 secs, 276 KB] Test 6: TEST OK [0.003 secs, 276 KB] Test 7: TEST OK [0.003 secs, 276 KB] Test 8: TEST OK [0.005 secs, 276 KB] Test 9: TEST OK [0.011 secs, 276 KB] Test 10: TEST OK [0.030 secs, 276 KB] All tests OK.

The Holstein cows were good at cold-resistant but afraid hot temperature, the suitable temperature was 11-16℃, suitable for farming in the Nanshan. The...

ɡ ] n 猪(供食用的, 尤指阉过的公猪)自私的或贪婪的 人 Holstein bull 荷斯坦公牛,黑白花公牛 HTACM—校正奶量:以泌乳天数和乳脂率校正产奶量而得出 的...

holstein—lewis 骨折: 肱骨远端 1/3 骨折伴桡神经嵌压。 hutchinson 骨折: 同 chauffeur 骨折。 jefferson 骨折: 寰椎环的压缩性骨折, 骨折是由枢椎压缩性外力...

Erd?lwerk Holstein Heide Refinery 90.000 bpd Bayernoil ? ? ? Others ? ? ? ? ? ? ? ? ? ? Buna SOW Leuna Refinery (Total), 222,000 bpd ...

holstein—lewis 骨折: 肱骨远端 1/3 骨折伴桡神经嵌压。 hutchinson 骨折: 同 chauffeur 骨折。 jefferson 骨折: 寰椎环的压缩性骨折,骨折是由枢椎压缩性外力引...

How many megawatts of electricity were added in 199...
In the windy northern state of Schleswig Holstein, wind now pro vides 15 percent of the electricity.最新上传套卷2016年高考模拟 理数 2015年高考真题 理数...

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