10.11
闲话
做题纪要
luogu P3345 [ZJOI2015] 幻想乡战略游戏
luogu P5311 [Ynoi2011] 成都七中
[ABC373F] Knapsack with Diminishing Values
- 暴力
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分组背包写个常数小点的加 \(C++20\) 加手动开 \(O3\) 就过了（赛时直接把火车头粘上了），算下来 \(AT\) 神机能跑 \(1e10\) 。
点击查看代码
#include<bits/stdc++.h> #pragma GCC optimize(3) #pragma GCC target("avx") #pragma GCC optimize("Ofast") #pragma GCC optimize("inline") #pragma GCC optimize("-fgcse") #pragma GCC optimize("-fgcse-lm") #pragma GCC optimize("-fipa-sra") #pragma GCC optimize("-ftree-pre") #pragma GCC optimize("-ftree-vrp") #pragma GCC optimize("-fpeephole2") #pragma GCC optimize("-ffast-math") #pragma GCC optimize("-fsched-spec") #pragma GCC optimize("unroll-loops") #pragma GCC optimize("-falign-jumps") #pragma GCC optimize("-falign-loops") #pragma GCC optimize("-falign-labels") #pragma GCC optimize("-fdevirtualize") #pragma GCC optimize("-fcaller-saves") #pragma GCC optimize("-fcrossjumping") #pragma GCC optimize("-fthread-jumps") #pragma GCC optimize("-funroll-loops") #pragma GCC optimize("-fwhole-program") #pragma GCC optimize("-freorder-blocks") #pragma GCC optimize("-fschedule-insns") #pragma GCC optimize("inline-functions") #pragma GCC optimize("-ftree-tail-merge") #pragma GCC optimize("-fschedule-insns2") #pragma GCC optimize("-fstrict-aliasing") #pragma GCC optimize("-fstrict-overflow") #pragma GCC optimize("-falign-functions") #pragma GCC optimize("-fcse-skip-blocks") #pragma GCC optimize("-fcse-follow-jumps") #pragma GCC optimize("-fsched-interblock") #pragma GCC optimize("-fpartial-inlining") #pragma GCC optimize("no-stack-protector") #pragma GCC optimize("-freorder-functions") #pragma GCC optimize("-findirect-inlining") #pragma GCC optimize("-fhoist-adjacent-loads") #pragma GCC optimize("-frerun-cse-after-loop") #pragma GCC optimize("inline-small-functions") #pragma GCC optimize("-finline-small-functions") #pragma GCC optimize("-ftree-switch-conversion") #pragma GCC optimize("-foptimize-sibling-calls") #pragma GCC optimize("-fexpensive-optimizations") #pragma GCC optimize("-funsafe-loop-optimizations") #pragma GCC optimize("inline-functions-called-once") #pragma GCC optimize("-fdelete-null-pointer-checks") using namespace std; #define ll long long #define ull unsigned long long #define sort stable_sort #define endl '\n' ll w[3010],v[3010],f[2][3010]; int main() { ll n,m,ans=0,i,j,k; cin>>n>>m; for(i=1;i<=n;i++) { cin>>w[i]>>v[i]; } for(i=1;i<=n;i++) { for(j=1;j<=m;j++) { f[i&1][j]=f[(i-1)&1][j]; } for(k=1;k*w[i]<=m;k++) { for(j=k*w[i];j<=m;j++) { f[i&1][j]=max(f[i&1][j],f[(i-1)&1][j-k*w[i]]+k*v[i]-k*k); } } } for(i=1;i<=m;i++) { ans=max(ans,f[n&1][i]); } cout<<ans<<endl; return 0; }
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