oj.uz

Submission #891945

# Submission time Handle Problem Language Result Execution time Memory
891945 2023-12-24T13:43:45 Z alexander707070 Chorus (JOI23_chorus) C++14
40 / 100
 764 ms 96416 KB 
#include<bits/stdc++.h>
#define MAXN 5007
using namespace std;

const int inf=1e15;

int n,k;
long long ans;
char s[MAXN];

long long dp[MAXN][MAXN];
int opt[MAXN][MAXN],pref[MAXN];
long long sum[MAXN][MAXN],sum2[MAXN][MAXN];

long long cost(int l,int r){
    if((r-l+1)%2!=0)return inf;

    return (sum[(r-l+1)/2][(l+r)/2] - sum[0][(l+r)/2-(r-l+1)/2] + sum2[(r-l+1)/2-1][(l+r)/2+1])/2;    
}

void solve(int l,int r,int optl,int optr,int k){
    if(l>r)return;

    int mid=(l+r)/2;
    dp[mid][k]=inf;

    for(int i=mid;i>=1;i--){
        if(dp[i-1][k-1]+cost(i,mid)<dp[mid][k]){
            dp[mid][k]=dp[i-1][k-1]+cost(i,mid);
            opt[mid][k]=i;
        }
    }

    solve(l,mid-1,optl,opt[mid][k],k);
    solve(mid+1,r,opt[mid][k],optr,k);
}

int main(){

    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);

    cin>>n>>k; 
    n*=2;
    cin>>(s+1);

    for(int i=1;i<=n;i++){
        if(s[i]=='A')pref[i]++;
        else pref[i]--;
        pref[i]+=pref[i-1];
    }

    for(int i=0;i<=n/2;i++){
        for(int f=1;f<=n;f++){
            sum[i][f]=max(i-pref[f],0);
            if(i>0)sum[i][f]+=sum[i-1][f-1];

            sum2[i][f]=max(i-pref[f],0);
            if(i>0)sum2[i][f]+=sum2[i-1][f+1];
        }
    }

    for(int i=1;i<=n;i++){
        dp[i][0]=inf;
    }

    ans=inf;
    for(int i=1;i<=k;i++){
        solve(1,n,1,n,i);
        ans=min(ans,dp[n][i]);
    }

    cout<<ans<<"\n";

    return 0;
}

Compilation message

chorus.cpp:5:15: warning: overflow in conversion from 'double' to 'int' changes value from '1.0e+15' to '2147483647' [-Woverflow]
    5 | const int inf=1e15;
      |               ^~~~

Subtask #1
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 6492 KB Output is correct
2 Correct 1 ms 6492 KB Output is correct
3 Correct 1 ms 4444 KB Output is correct
4 Correct 1 ms 6492 KB Output is correct
5 Correct 1 ms 4440 KB Output is correct
6 Correct 1 ms 6492 KB Output is correct
7 Correct 1 ms 6492 KB Output is correct
8 Correct 1 ms 6492 KB Output is correct
9 Correct 1 ms 6492 KB Output is correct
10 Correct 1 ms 6744 KB Output is correct
11 Correct 1 ms 6488 KB Output is correct
12 Correct 2 ms 6492 KB Output is correct
13 Correct 1 ms 6492 KB Output is correct
14 Correct 1 ms 6492 KB Output is correct
15 Correct 1 ms 6628 KB Output is correct
16 Correct 1 ms 6492 KB Output is correct

Subtask #2
24.0 / 24.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 6492 KB Output is correct
2 Correct 1 ms 6492 KB Output is correct
3 Correct 1 ms 4444 KB Output is correct
4 Correct 1 ms 6492 KB Output is correct
5 Correct 1 ms 4440 KB Output is correct
6 Correct 1 ms 6492 KB Output is correct
7 Correct 1 ms 6492 KB Output is correct
8 Correct 1 ms 6492 KB Output is correct
9 Correct 1 ms 6492 KB Output is correct
10 Correct 1 ms 6744 KB Output is correct
11 Correct 1 ms 6488 KB Output is correct
12 Correct 2 ms 6492 KB Output is correct
13 Correct 1 ms 6492 KB Output is correct
14 Correct 1 ms 6492 KB Output is correct
15 Correct 1 ms 6628 KB Output is correct
16 Correct 1 ms 6492 KB Output is correct
17 Correct 16 ms 33884 KB Output is correct
18 Correct 167 ms 96144 KB Output is correct
19 Correct 433 ms 96156 KB Output is correct
20 Correct 15 ms 95836 KB Output is correct
21 Correct 17 ms 95836 KB Output is correct
22 Correct 752 ms 96408 KB Output is correct
23 Correct 749 ms 96336 KB Output is correct
24 Correct 28 ms 95836 KB Output is correct
25 Correct 764 ms 96212 KB Output is correct
26 Correct 636 ms 96416 KB Output is correct
27 Correct 277 ms 96084 KB Output is correct
28 Correct 281 ms 95948 KB Output is correct

Subtask #3
0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 6492 KB Output is correct
2 Correct 1 ms 6492 KB Output is correct
3 Correct 1 ms 4444 KB Output is correct
4 Correct 1 ms 6492 KB Output is correct
5 Correct 1 ms 4440 KB Output is correct
6 Correct 1 ms 6492 KB Output is correct
7 Correct 1 ms 6492 KB Output is correct
8 Correct 1 ms 6492 KB Output is correct
9 Correct 1 ms 6492 KB Output is correct
10 Correct 1 ms 6744 KB Output is correct
11 Correct 1 ms 6488 KB Output is correct
12 Correct 2 ms 6492 KB Output is correct
13 Correct 1 ms 6492 KB Output is correct
14 Correct 1 ms 6492 KB Output is correct
15 Correct 1 ms 6628 KB Output is correct
16 Correct 1 ms 6492 KB Output is correct
17 Correct 16 ms 33884 KB Output is correct
18 Correct 167 ms 96144 KB Output is correct
19 Correct 433 ms 96156 KB Output is correct
20 Correct 15 ms 95836 KB Output is correct
21 Correct 17 ms 95836 KB Output is correct
22 Correct 752 ms 96408 KB Output is correct
23 Correct 749 ms 96336 KB Output is correct
24 Correct 28 ms 95836 KB Output is correct
25 Correct 764 ms 96212 KB Output is correct
26 Correct 636 ms 96416 KB Output is correct
27 Correct 277 ms 96084 KB Output is correct
28 Correct 281 ms 95948 KB Output is correct
29 Runtime error 13 ms 348 KB Execution killed with signal 11
30 Halted 0 ms 0 KB -

Subtask #4
0 / 26.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 6492 KB Output is correct
2 Correct 1 ms 6492 KB Output is correct
3 Correct 1 ms 4444 KB Output is correct
4 Correct 1 ms 6492 KB Output is correct
5 Correct 1 ms 4440 KB Output is correct
6 Correct 1 ms 6492 KB Output is correct
7 Correct 1 ms 6492 KB Output is correct
8 Correct 1 ms 6492 KB Output is correct
9 Correct 1 ms 6492 KB Output is correct
10 Correct 1 ms 6744 KB Output is correct
11 Correct 1 ms 6488 KB Output is correct
12 Correct 2 ms 6492 KB Output is correct
13 Correct 1 ms 6492 KB Output is correct
14 Correct 1 ms 6492 KB Output is correct
15 Correct 1 ms 6628 KB Output is correct
16 Correct 1 ms 6492 KB Output is correct
17 Correct 16 ms 33884 KB Output is correct
18 Correct 167 ms 96144 KB Output is correct
19 Correct 433 ms 96156 KB Output is correct
20 Correct 15 ms 95836 KB Output is correct
21 Correct 17 ms 95836 KB Output is correct
22 Correct 752 ms 96408 KB Output is correct
23 Correct 749 ms 96336 KB Output is correct
24 Correct 28 ms 95836 KB Output is correct
25 Correct 764 ms 96212 KB Output is correct
26 Correct 636 ms 96416 KB Output is correct
27 Correct 277 ms 96084 KB Output is correct
28 Correct 281 ms 95948 KB Output is correct
29 Runtime error 13 ms 348 KB Execution killed with signal 11
30 Halted 0 ms 0 KB -

Subtask #5
0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 6492 KB Output is correct
2 Correct 1 ms 6492 KB Output is correct
3 Correct 1 ms 4444 KB Output is correct
4 Correct 1 ms 6492 KB Output is correct
5 Correct 1 ms 4440 KB Output is correct
6 Correct 1 ms 6492 KB Output is correct
7 Correct 1 ms 6492 KB Output is correct
8 Correct 1 ms 6492 KB Output is correct
9 Correct 1 ms 6492 KB Output is correct
10 Correct 1 ms 6744 KB Output is correct
11 Correct 1 ms 6488 KB Output is correct
12 Correct 2 ms 6492 KB Output is correct
13 Correct 1 ms 6492 KB Output is correct
14 Correct 1 ms 6492 KB Output is correct
15 Correct 1 ms 6628 KB Output is correct
16 Correct 1 ms 6492 KB Output is correct
17 Correct 16 ms 33884 KB Output is correct
18 Correct 167 ms 96144 KB Output is correct
19 Correct 433 ms 96156 KB Output is correct
20 Correct 15 ms 95836 KB Output is correct
21 Correct 17 ms 95836 KB Output is correct
22 Correct 752 ms 96408 KB Output is correct
23 Correct 749 ms 96336 KB Output is correct
24 Correct 28 ms 95836 KB Output is correct
25 Correct 764 ms 96212 KB Output is correct
26 Correct 636 ms 96416 KB Output is correct
27 Correct 277 ms 96084 KB Output is correct
28 Correct 281 ms 95948 KB Output is correct
29 Runtime error 13 ms 348 KB Execution killed with signal 11
30 Halted 0 ms 0 KB -