poj 2184 Cow Exhibition
2013-07-29 14:50
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题目:http://poj.org/problem?id=2184
负体积的01背包,将原点偏移一下,空间变大了
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负体积的01背包,将原点偏移一下,空间变大了
#include <cstdio> #include <cstring> #include <algorithm> #include <map> #include <iostream> #include <vector> #include <cmath> #define maxn 200010 using namespace std; int s[110],f[110]; int dp[maxn]; const int miao=100000; int main() { int n; scanf("%d",&n); int sum=0; for(int i=1;i<=n;i++) scanf("%d%d",&s[i],&f[i]); for(int i=0;i<maxn;i++) dp[i]=-20000000; dp[miao]=0; for(int i=1;i<=n;i++) if(s[i]>0) for(int j=maxn-1;j>=s[i];j--) dp[j]=max(dp[j],dp[j-s[i]]+f[i]); else for(int j=0;j<maxn+s[i];j++) dp[j]=max(dp[j],dp[j-s[i]]+f[i]); int ans=0; for(int i=miao;i<maxn;i++) if(dp[i]>0) ans=max(ans,dp[i]+i-miao); printf("%d\n",ans); return 0; }
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