#940644 (C++14) No.1867 Partitions and Inversions

• 問題: No.1867 Partitions and Inversions
• ユーザー: Shuai Zui
• 提出日時: 2023-12-27 10:14:31
• 言語: C++14 (gcc 12.3.0 + boost 1.83.0)
• 結果: AC
• 実行時間: 772 ms / 5,000 ms
• コード長: 2,004 bytes
• コンパイル時間: 2,910 ms
• コンパイル使用メモリ: 183,180 KB
• 実行使用メモリ: 70,880 KB
• 最終ジャッジ日時: 2023-12-27 10:15:06
• 合計ジャッジ時間: 32,862 ms
• ジャッジサーバーID （参考情報）: judge12 / judge15

入力	結果	実行時間; 実行使用メモリ
testcase_00	AC	3 ms; 7,748 KB
testcase_01	AC	3 ms; 7,748 KB
testcase_02	AC	731 ms; 70,880 KB
testcase_03	AC	747 ms; 70,880 KB
testcase_04	AC	737 ms; 70,880 KB
testcase_05	AC	754 ms; 70,880 KB
testcase_06	AC	745 ms; 70,880 KB
testcase_07	AC	731 ms; 70,880 KB
testcase_08	AC	767 ms; 70,880 KB
testcase_09	AC	732 ms; 70,880 KB
testcase_10	AC	748 ms; 70,880 KB
testcase_11	AC	713 ms; 70,880 KB
testcase_12	AC	757 ms; 70,880 KB
testcase_13	AC	727 ms; 70,880 KB
testcase_14	AC	749 ms; 70,880 KB
testcase_15	AC	737 ms; 70,880 KB
testcase_16	AC	734 ms; 70,880 KB
testcase_17	AC	772 ms; 70,880 KB
testcase_18	AC	720 ms; 70,880 KB
testcase_19	AC	735 ms; 70,880 KB
testcase_20	AC	694 ms; 70,880 KB
testcase_21	AC	742 ms; 70,880 KB
testcase_22	AC	741 ms; 70,880 KB
testcase_23	AC	735 ms; 70,880 KB
testcase_24	AC	723 ms; 70,880 KB
testcase_25	AC	769 ms; 70,880 KB
testcase_26	AC	737 ms; 70,880 KB
testcase_27	AC	740 ms; 70,880 KB
testcase_28	AC	720 ms; 70,880 KB
testcase_29	AC	720 ms; 70,880 KB
testcase_30	AC	767 ms; 70,880 KB
testcase_31	AC	725 ms; 70,880 KB
testcase_32	AC	3 ms; 7,748 KB
testcase_33	AC	3 ms; 9,796 KB
testcase_34	AC	3 ms; 9,796 KB
testcase_35	AC	3 ms; 9,796 KB
testcase_36	AC	4 ms; 9,796 KB
testcase_37	AC	3 ms; 9,796 KB
testcase_38	AC	13 ms; 17,424 KB
testcase_39	AC	13 ms; 17,424 KB
testcase_40	AC	13 ms; 17,424 KB
testcase_41	AC	13 ms; 17,424 KB
testcase_42	AC	14 ms; 17,424 KB
testcase_43	AC	281 ms; 49,784 KB
testcase_44	AC	291 ms; 49,784 KB
testcase_45	AC	295 ms; 49,784 KB
testcase_46	AC	276 ms; 49,784 KB
testcase_47	AC	269 ms; 49,784 KB
testcase_48	AC	296 ms; 49,784 KB
testcase_49	AC	286 ms; 49,784 KB
testcase_50	AC	272 ms; 49,784 KB
testcase_51	AC	297 ms; 49,784 KB
testcase_52	AC	282 ms; 49,784 KB
testcase_53	AC	262 ms; 49,784 KB
testcase_54	AC	298 ms; 49,784 KB
testcase_55	AC	273 ms; 49,784 KB
testcase_56	AC	301 ms; 49,784 KB
testcase_57	AC	319 ms; 49,784 KB
testcase_58	AC	281 ms; 49,784 KB
testcase_59	AC	285 ms; 49,784 KB
testcase_60	AC	272 ms; 49,784 KB
testcase_61	AC	272 ms; 49,784 KB
testcase_62	AC	319 ms; 49,784 KB
testcase_63	AC	669 ms; 70,880 KB
testcase_64	AC	3 ms; 9,796 KB
testcase_65	AC	3 ms; 9,796 KB
testcase_66	AC	3 ms; 9,796 KB
testcase_67	AC	197 ms; 70,880 KB

ソースコード

#pragma GCC optimize(2)
#include<bits/stdc++.h>
// #define int long long
// #define uint unsigned long long
#define il inline
#define ct const
#define dl double
#define pk push_back
#define fi first
#define N 3010
#define se second
#define pii pair<int,int>
// #define inf (int)(1000000000000000000)
using namespace std;
#define lowbit(x) (x&-x)
#define getchar() (p1==p2&&(p2=(p1=buf)+fread(buf,1,1<<21,stdin),p1==p2)?EOF:*p1++)
char buf[1<<21],*p1=buf,*p2=buf;
il int read(){
	int x=0,f=1;char ch=getchar();
	while(ch<'0'||ch>'9'){
		if(ch=='-') f=-1;
		ch=getchar();
	}
	while(ch>='0'&&ch<='9'){
		x=(x<<1)+(x<<3)+(ch^48);ch=getchar();
	}
	return x*f;
}
char f__[40];
il void write(int x){
	int cnt=0;
	if(x<0){
		putchar('-');x=-x;
	}
	if(!x) putchar('0');
	while(x){
		f__[cnt++]=x%10+'0';x/=10;
	}
	while(cnt) putchar(f__[--cnt]);
}
int n,p[N],sum[N][N],f[N],g[N],s[N][N];
int stk[N],top,id[N];
signed main(){
    // freopen("1.in","r",stdin);
    // freopen("1.out","w",stdout);
	n=read();
	for(int i=1;i<=n;++i) p[i]=read();
	for(int i=1;i<=n;++i){
		for(int j=1;j<=i;++j) ++sum[i][p[j]];
		for(int j=1;j<=n;++j) sum[i][j]+=sum[i][j-1];
	}
	for(int i=0;i<=n;++i){
		for(int j=i+1;j<=n;++j){
			s[i][j]=s[i][j-1]+sum[i][n]-sum[i][p[j]];
		}
	}
	memset(f,0x3f,sizeof(f));
	memset(g,0x3f,sizeof(g));
	f[0]=0;
	for(int j=1;j<=n;++j){
		stk[top=1]=n;id[1]=0;
		for(int i=1;i<=n;++i){
			while(top&&stk[top]<i) --top;
			g[i]=f[id[top]]+s[id[top]][i];
			// cerr<<top<<" "<<id[top]<<" "<<g[i]<<" "<<stk[top]<<"\n";
			while(top){
				if(stk[top]<=i||f[id[top]]+s[id[top]][stk[top]]>=f[i]+s[i][stk[top]]){
					--top;continue;
				}
				int l=i+1,r=stk[top]-1;
				while(l<=r){
					// cerr<<"ERROR";
					int mid=(l+r)>>1;
					if(f[id[top]]+s[id[top]][mid]<=f[i]+s[i][mid]) r=mid-1;
					else l=mid+1;
				}
				--l;
				if(l>i){
					stk[++top]=l;id[top]=i;
				}
				break;
			}
			if(!top){
				stk[top=1]=n;id[top]=i;
			}
		}
		write(g[n]);putchar('\n');
		memcpy(f,g,sizeof(f));
	}
	return 0;
}