oj.uz

Submission #419752

# Submission time Handle Problem Language Result Execution time Memory
419752 2021-06-07T12:16:24 Z Kerim Group Photo (JOI21_ho_t3) C++17
0 / 100
 94 ms 196168 KB 
#include "bits/stdc++.h"
#define MAXN 100009
#define INF 1000000007
#define mp(x,y) make_pair(x,y)
#define all(v) v.begin(),v.end()
#define pb(x) push_back(x)
#define wr cout<<"----------------"<<endl;
#define ppb() pop_back()
#define tr(ii,c) for(__typeof((c).begin()) ii=(c).begin();ii!=(c).end();ii++)
#define ff first
#define ss second
#define my_little_dodge 46
#define debug(x)  cerr<< #x <<" = "<< x<<endl;
using namespace std;
 
typedef long long ll;
typedef pair<int,int> PII;
template<class T>bool umin(T& a,T b){if(a>b){a=b;return 1;}return 0;}
template<class T>bool umax(T& a,T b){if(a<b){a=b;return 1;}return 0;}
const int N=5002;
int n,arr[N],inv[N][N],dp[N][N],odp[N][N];
int F[N][N],AB[N][N],BA[N][N],par[N][N],G[N][N];
int g(int x,int y){
	if(x>=y)return 0;
	if(~odp[x][y])return odp[x][y];
	return odp[x][y]=g(x,y-1)+par[y][y]-par[x-1][y];
}
int cost(int a,int b,int c){
	return g(a+1,b-1)+F[a][b-1]+(BA[b][b-1]-BA[b][a])+AB[c][b];
}
int rec(int a,int b){
	if(b==n)return cost(a,b,0);
	int &ret=dp[a][b];
	if(~ret)return ret;
	ret=INF;
	for(int i=b+1;i<=n;i++)
		umin(ret,rec(b,i)+cost(a,b,i));
	return ret;
}
int main(){
	//freopen("file.in", "r", stdin);
	memset(dp,-1,sizeof dp);
	memset(odp,-1,sizeof odp);
	scanf("%d",&n);
	for(int i=1;i<=n;i++)scanf("%d",arr+i);
	for(int i=2;i<=n;i++)
		for(int j=1;j<i;j++)
			inv[arr[i]][arr[j]]++;
	for(int i=1;i<=n;i++)
		for(int j=1;j<=n;j++)
			par[i][j]=par[i-1][j]+inv[j][i];
	for(int z=1;z<=n;z++)
		for(int x=1;x<=n;x++)
			G[x][z]=G[x-1][z]+inv[x][z];
	for(int y=1;y<=n;y++)
		for(int z=y+1;z<=n;z++){
			F[y][z]=F[y][z-1]+G[z][y];
		}
	for(int i=1;i<=n;i++)
		for(int j=1;j<=n;j++){
			BA[i][j]=BA[i][j-1]+inv[i][j];
			AB[i][j]=AB[i][j-1]+inv[j][i];
		}
	int ans=INF;
	for(int i=1;i<=n;i++)
		umin(ans,rec(0,i));
	printf("%d\n",ans);
	return 0;
}

Compilation message

Main.cpp: In function 'int main()':
Main.cpp:44:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   44 |  scanf("%d",&n);
      |  ~~~~~^~~~~~~~~
Main.cpp:45:28: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   45 |  for(int i=1;i<=n;i++)scanf("%d",arr+i);
      |                       ~~~~~^~~~~~~~~~~~

Subtask #1
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 89 ms 196164 KB Output is correct
2 Incorrect 94 ms 196168 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #2
0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 89 ms 196164 KB Output is correct
2 Incorrect 94 ms 196168 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #3
0 / 32.0

# Verdict Execution time Memory Grader output
1 Correct 89 ms 196164 KB Output is correct
2 Incorrect 94 ms 196168 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #4
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 89 ms 196164 KB Output is correct
2 Incorrect 94 ms 196168 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #5
0 / 36.0

# Verdict Execution time Memory Grader output
1 Correct 89 ms 196164 KB Output is correct
2 Incorrect 94 ms 196168 KB Output isn't correct
3 Halted 0 ms 0 KB -