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Relocation
Description Emma and Eric are moving to their new house they bought after returning from their honeymoon. Fortunately, they have a few friends helping them relocate. To move the furniture, they only have two compact cars, which complicates everything a bit. Since the furniture does not fit into the cars, Eric wants to put them on top of the cars. However, both cars only support a certain weight on their roof, so they will have to do several trips to transport everything. The schedule for the move is planed like this:
Note, that the group is always staying together so that they can have more fun and nobody feels lonely. Since the distance between the houses is quite large, Eric wants to make as few trips as possible. Given the weights wi of each individual piece of furniture and the capacities C1 and C2 of the two cars, how many trips to the new house does the party have to make to move all the furniture? If a car has capacity C, the sum of the weights of all the furniture it loads for one trip can be at most C. Input The first line contains the number of scenarios. Each scenario consists of one line containing three numbers n, C1 and C2. C1 and C2 are the capacities of the cars (1 ≤ Ci ≤ 100) and n is the number of pieces of furniture (1 ≤ n ≤ 10). The following line will contain n integers w1, …, wn, the weights of the furniture (1 ≤ wi ≤ 100). It is guaranteed that each piece of furniture can be loaded by at least one of the two cars. Output The output for every scenario begins with a line containing “Scenario #i:”, where i is the number of the scenario starting at 1. Then print a single line with the number of trips to the new house they have to make to move all the furniture. Terminate each scenario with a blank line. Sample Input 2 6 12 13 3 9 13 3 10 11 7 1 100 1 2 33 50 50 67 98 Sample Output Scenario #1: 2 Scenario #2: 3 Source TUD Programming Contest 2006, Darmstadt, Germany
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#include <iostream> #include <string.h> #include <stdio.h> #include <algorithm> #include <string> using namespace std; #define INF 0x3ffffff int c1,c2,n; int g[11]; int save[10010]; int dp[10010]; int check(int s) { int tg[10]; int cnt=0; int sum=0; for(int i=0;i<n;i++) { if( ((1<<i)&s) != 0 ) { tg[cnt++]=g[i]; sum+=g[i]; } } for(int i=0;i<(1<<cnt);i++) { int tmp,tmp1; tmp=tmp1=0; for(int j=0;j<cnt;j++) { if( ((1<<j)&i)!=0) { tmp+=tg[j]; } } tmp1=sum-tmp; if(tmp<=c1&&tmp1<=c2) { return 1; } } // tmp tmp1 分别代表放入的不同地方 return 0; } int main() { int T; scanf("%d",&T); int tt=1; while(T--) { scanf("%d%d%d",&n,&c1,&c2); for(int i=0;i<n;i++) scanf("%d",g+i); int cnt=0; for(int i=1;i<(1<<n);i++)//不能从0开始吧 { if(check(i)==1) { save[cnt++]=i; } } // 求出所有可以当成一次背包的所有情况 // 从000000 -> 111111 for(int i=1;i<(1<<n);i++) dp[i]=INF; dp[0]=0; for(int i=0;i<cnt;i++) { for(int j=(1<<n);j>=save[i];j--) { if( (j| save[i] ) != j) continue; dp[j]=min(dp[j],dp[j^save[i]]+1); } } printf("Scenario #%d: ",tt++); printf("%d ",dp[(1<<n)-1]); printf(" "); } return 0; }