oj.uz

Submission #924002

# Submission time Handle Problem Language Result Execution time Memory
924002 2024-02-08T08:31:09 Z yeediot Collecting Stamps 3 (JOI20_ho_t3) C++14
5 / 100
 270 ms 424448 KB 
#include<bits/stdc++.h>
using namespace std;
#define int long long
#define pii pair<int,int>
#define sz(x) (int)(x.size())
#define all(x) x.begin(),x.end()
#define F first
#define S second
#define pb push_back
#ifdef local
void setio(){freopen("/Users/iantsai/Library/Mobile Documents/com~apple~CloudDocs/cpp/Empty.md","r",stdin);}
#define debug(x...) cerr << "[" << #x << "] = ["; _print(x)
#else
void setio(){}
#define debug(x...)
#endif
const int mxn=405;
int dp[mxn][mxn][mxn/2][2];
signed main(){
    ios::sync_with_stdio(0);
    cin.tie(0);cout.tie(0);
    setio();
    int n,l;
    cin>>n>>l;
    vector<pii>temp;
    vector<int>pos(2*n+1);
    vector<int>time(2*n+1);
    temp.pb({0,0});
    for(int i=0;i<n;i++){
        int x;
        cin>>x;
        temp.pb({x,0});
    }
    for(int i=0;i<n;i++){
        int t;
        cin>>t;
        temp[i+1].S=t;
    }
    sort(all(temp));
    for(int i=1;i<=n;i++){
        time[i]=time[i+n]=temp[i].S;
        pos[i]=temp[i].F;
        pos[i+n]=temp[i].F+l;
    }
    for(int i=0;i<=2*n;i++){
        for(int j=0;j<=2*n;j++){
            for(int k=0;k<=2*n;k++){
                dp[i][j][k][0]=dp[i][j][k][1]=2e9;
            }
        }
    }
    int ans=0;
    for(int i=1;i<=2*n;i++){
        if(abs(pos[i]-l)<=time[i]){
            dp[i][i][1][0]=dp[i][i][1][1]=abs(pos[i]-l);
            ans=1;
        }
    }
    for(int k=2;k<=n;k++){
        for(int l=2*n;l>=1;l--){
            for(int r=l+1;r<=2*n;r++){
                if(l==r)continue;
                dp[l][r][k][0]=min(dp[l+1][r][k][0]+abs(pos[l]-pos[l+1]),
                                   dp[l+1][r][k][1]+abs(pos[l]-pos[r]));
                if(dp[l+1][r][k-1][0]+abs(pos[l]-pos[l+1])<=time[l])dp[l][r][k][0]=min(dp[l][r][k][0],dp[l+1][r][k-1][0]+abs(pos[l]-pos[l+1]));
                if(dp[l+1][r][k-1][1]+abs(pos[l]-pos[  r])<=time[l])dp[l][r][k][0]=min(dp[l][r][k][0],dp[l+1][r][k-1][1]+abs(pos[l]-pos[r]));
                dp[l][r][k][1]=min(dp[l][r-1][k][0]+abs(pos[r  ]-pos[l]),
                                   dp[l][r-1][k][1]+abs(pos[r-1]-pos[r]));
                if(dp[l][r-1][k-1][0]+abs(pos[l]-pos[  r])<=time[r])dp[l][r][k][1]=min(dp[l][r][k][1],dp[l][r-1][k-1][0]+abs(pos[l]-pos[r]));
                if(dp[l][r-1][k-1][1]+abs(pos[r-1]-pos[r])<=time[r])dp[l][r][k][1]=min(dp[l][r][k][1],dp[l][r-1][k-1][1]+abs(pos[r-1]-pos[r]));
                dp[l][r][k][0]=min(dp[l][r][k][0],(int)2e9);
                dp[l][r][k][1]=min(dp[l][r][k][1],(int)2e9);
                if(r-l+1<=n and (dp[l][r][k][0]<2e9 or dp[l][r][k][1]<2e9)){
                    ans=max(ans,k);
                }
                //cout<<l<<' '<<r<<' '<<k<<' '<<dp[l][r][k][0]<<' '<<dp[l][r][k][1]<<'\n';
            }
        }
    }
    cout<<ans<<'\n';
}
/*
dp[l][r][k][0/1] min time to collect k stamps between lth~rth stamp 0->ends at l 1->ends at r
dp[l][r][k][0]=if(dp[l+1][r][k-1][0]+x[l]-x[l-1]<=t[l])dp[l-1][r][k-1][0]+x[l]-x[l-1]
               if(dp[l+1][r][k-1][1]+x[l]-x[r]<=t[l])
               dp[l-1][r][k][0]+x[l]-x[l-1]
               dp[l-1][r][k][1]+x[l]-x[r]
*/

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 14684 KB Output is correct
2 Correct 2 ms 14684 KB Output is correct
3 Correct 3 ms 24924 KB Output is correct
4 Correct 2 ms 16732 KB Output is correct
5 Correct 2 ms 18780 KB Output is correct
6 Correct 4 ms 31068 KB Output is correct
7 Correct 3 ms 20828 KB Output is correct
8 Correct 3 ms 26972 KB Output is correct
9 Correct 4 ms 31068 KB Output is correct
10 Correct 1 ms 4444 KB Output is correct
11 Correct 1 ms 4444 KB Output is correct
12 Correct 4 ms 31068 KB Output is correct
13 Correct 4 ms 31068 KB Output is correct
14 Correct 3 ms 18780 KB Output is correct
15 Correct 3 ms 20828 KB Output is correct
16 Correct 4 ms 31068 KB Output is correct
17 Correct 4 ms 31292 KB Output is correct

Subtask #2
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 14684 KB Output is correct
2 Correct 2 ms 14684 KB Output is correct
3 Correct 3 ms 24924 KB Output is correct
4 Correct 2 ms 16732 KB Output is correct
5 Correct 2 ms 18780 KB Output is correct
6 Correct 4 ms 31068 KB Output is correct
7 Correct 3 ms 20828 KB Output is correct
8 Correct 3 ms 26972 KB Output is correct
9 Correct 4 ms 31068 KB Output is correct
10 Correct 1 ms 4444 KB Output is correct
11 Correct 1 ms 4444 KB Output is correct
12 Correct 4 ms 31068 KB Output is correct
13 Correct 4 ms 31068 KB Output is correct
14 Correct 3 ms 18780 KB Output is correct
15 Correct 3 ms 20828 KB Output is correct
16 Correct 4 ms 31068 KB Output is correct
17 Correct 4 ms 31292 KB Output is correct
18 Correct 4 ms 37468 KB Output is correct
19 Incorrect 3 ms 26972 KB Output isn't correct
20 Halted 0 ms 0 KB -

Subtask #3
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 14684 KB Output is correct
2 Correct 2 ms 14684 KB Output is correct
3 Correct 3 ms 24924 KB Output is correct
4 Correct 2 ms 16732 KB Output is correct
5 Correct 2 ms 18780 KB Output is correct
6 Correct 4 ms 31068 KB Output is correct
7 Correct 3 ms 20828 KB Output is correct
8 Correct 3 ms 26972 KB Output is correct
9 Correct 4 ms 31068 KB Output is correct
10 Correct 1 ms 4444 KB Output is correct
11 Correct 1 ms 4444 KB Output is correct
12 Correct 4 ms 31068 KB Output is correct
13 Correct 4 ms 31068 KB Output is correct
14 Correct 3 ms 18780 KB Output is correct
15 Correct 3 ms 20828 KB Output is correct
16 Correct 4 ms 31068 KB Output is correct
17 Correct 4 ms 31292 KB Output is correct
18 Correct 270 ms 424448 KB Output is correct
19 Correct 136 ms 287824 KB Output is correct
20 Correct 65 ms 195668 KB Output is correct
21 Correct 138 ms 276312 KB Output is correct
22 Correct 186 ms 334648 KB Output is correct
23 Correct 52 ms 181072 KB Output is correct
24 Incorrect 42 ms 163416 KB Output isn't correct
25 Halted 0 ms 0 KB -

Subtask #4
0 / 75.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 14684 KB Output is correct
2 Correct 2 ms 14684 KB Output is correct
3 Correct 3 ms 24924 KB Output is correct
4 Correct 2 ms 16732 KB Output is correct
5 Correct 2 ms 18780 KB Output is correct
6 Correct 4 ms 31068 KB Output is correct
7 Correct 3 ms 20828 KB Output is correct
8 Correct 3 ms 26972 KB Output is correct
9 Correct 4 ms 31068 KB Output is correct
10 Correct 1 ms 4444 KB Output is correct
11 Correct 1 ms 4444 KB Output is correct
12 Correct 4 ms 31068 KB Output is correct
13 Correct 4 ms 31068 KB Output is correct
14 Correct 3 ms 18780 KB Output is correct
15 Correct 3 ms 20828 KB Output is correct
16 Correct 4 ms 31068 KB Output is correct
17 Correct 4 ms 31292 KB Output is correct
18 Correct 4 ms 37468 KB Output is correct
19 Incorrect 3 ms 26972 KB Output isn't correct
20 Halted 0 ms 0 KB -