CSES - Datatähti 2026 loppu

Submission details
Task:	Bittijono
Sender:	xiaou0
Submission time:	2026-01-17 15:45:22 +0200
Language:	C++ (C++17)
Status:	READY
Result:	37

Feedback
group	verdict	score
#1	ACCEPTED	21
#2	ACCEPTED	16
#3	WRONG ANSWER	0

Test results
test	verdict	time	group
#1	ACCEPTED	0.00 s	1, 3	details
#2	ACCEPTED	0.00 s	1, 2, 3	details
#3	ACCEPTED	0.00 s	1, 3	details
#4	ACCEPTED	0.00 s	1, 3	details
#5	ACCEPTED	0.00 s	1, 3	details
#6	ACCEPTED	0.01 s	3	details
#7	ACCEPTED	0.01 s	2, 3	details
#8	ACCEPTED	0.01 s	3	details
#9	ACCEPTED	0.01 s	2, 3	details
#10	ACCEPTED	0.01 s	2, 3	details
#11	WRONG ANSWER	0.01 s	3	details
#12	ACCEPTED	0.01 s	2, 3	details
#13	ACCEPTED	0.01 s	3	details
#14	WRONG ANSWER	0.01 s	3	details
#15	WRONG ANSWER	0.01 s	3	details
#16	ACCEPTED	0.00 s	1, 2, 3	details
#17	ACCEPTED	0.00 s	1, 3	details
#18	ACCEPTED	0.00 s	1, 3	details
#19	ACCEPTED	0.02 s	3	details
#20	ACCEPTED	0.01 s	3	details

Code

#include <bits/stdc++.h>
using namespace std;

typedef long long ll;   

ll n,a,b;

ll cost(ll len){
    return min(len*a,b);
}

const ll N=100009;
ll x[N],c[N];
ll m,s;

void input(){
    cin>>n>>a>>b;
    string s1,s2;
    cin>>s1;
    cin>>s2;
    x[0]=(s1[0]==s2[0]?0:1);
    m=1;c[1]=1;
    for(ll i=1;i<n;++i){
        x[i]=(s1[i]==s2[i]?0:1);
        if(x[i]!=x[i-1]){
            ++m;
            c[m]=1;
        }else{
            c[m]++;
        }
    }
    if(x[0]==0){
        s=1;
    }else{
        s=2;
    }
}

void solve(){
    ll ans=0;
    for(ll i=(x[0]==1?1:2);i<=m;i+=2){
        ans+=cost(c[i]);
    }
    bool cont=false;
    for(ll i=(x[0]==0?1:2);i<=m;i+=2){
        if(!cont){
            ll newc=cost(c[i-1]+c[i]+c[i+1])+cost(c[i]);
            ll oldc=cost(c[i-1])+cost(c[i+1]);
            if(newc<oldc){
                ans-=oldc;
                ans+=newc;
                cont=true;
            }
        }
        else{
            if(cost(c[i])<cost(c[i+1])){
                ans-=cost(c[i+1]);
                ans+=cost(c[i]);
            }
            else{
                cont=false;
            }
        }
    }
    cout<<ans<<endl;
}

int main(){
    input();
    solve();
}

Test details

Test 1 (public)

Group: 1, 3

Verdict: ACCEPTED

input
`8 3 5 10110001 01101000` view save

correct output
`11` view save

user output
`11` view save

Test 2

Group: 1, 2, 3

Verdict: ACCEPTED

input
`10 644 644 0111000100 0000010111` view save

correct output
`1932` view save

user output
`1932` view save

Test 3

Group: 1, 3

Verdict: ACCEPTED

input
`10 493 986 0001110000 0001100001` view save

correct output
`986` view save

user output
`986` view save

Test 4

Group: 1, 3

Verdict: ACCEPTED

input
`10 240 720 1011001110 1000000001` view save

correct output
`1200` view save

user output
`1200` view save

Test 5

Group: 1, 3

Verdict: ACCEPTED

input
`10 3 7 1110111111 0010010101` view save

correct output
`15` view save

user output
`15` view save

Test 6

Group: 3

Verdict: ACCEPTED

input
`100000 1 1000000000 001100110010101001010111000110...` view save

correct output
`50252` view save

user output
`50252` view save

Test 7

Group: 2, 3

Verdict: ACCEPTED

input
`100000 1000000000 1 110010000110110100110110101011...` view save

correct output
`25055` view save

user output
`25055` view save

Test 8

Group: 3

Verdict: ACCEPTED

input
`100000 1000 1000000000 001001101010100000011110000101...` view save

correct output
`50001000` view save

user output
`50001000` view save

Test 9

Group: 2, 3

Verdict: ACCEPTED

input
`100000 1000000000 1000 101010110001010011011011101110...` view save

correct output
`24939000` view save

user output
`24939000` view save

Test 10

Group: 2, 3

Verdict: ACCEPTED

input
`100000 1000000000 1000000000 001000000001000000000010110111...` view save

correct output
`25023000000000` view save

user output
`25023000000000` view save

Test 11

Group: 3

Verdict: WRONG ANSWER

input
`100000 123456789 987654321 100010110100011000001111001110...` view save

correct output
`5475678967593` view save

user output
`6058271552202` view save

Feedback: Incorrect character on line 1 col 1: expected "5475678967593", got "6058271552202"

Test 12

Group: 2, 3

Verdict: ACCEPTED

input
`100000 987654321 123456789 000100110000010110111101111101...` view save

correct output
`3071481453531` view save

user output
`3071481453531` view save

Test 13

Group: 3

Verdict: ACCEPTED

input
`100000 1000000 1000000000 001100110010100011000111101100...` view save

correct output
`49916000000` view save

user output
`49916000000` view save

Test 14

Group: 3

Verdict: WRONG ANSWER

input
`100000 10000000 1000000000 110111101101111110100101011000...` view save

correct output
`494930000000` view save

user output
`498750000000` view save

Feedback: Incorrect character on line 1 col 3: expected "494930000000", got "498750000000"

Test 15

Group: 3

Verdict: WRONG ANSWER

input
`100000 100000000 1000000000 111110000010100011011100110010...` view save

correct output
`4547300000000` view save

user output
`4988900000000` view save

Feedback: Incorrect character on line 1 col 2: expected "4547300000000", got "4988900000000"

Test 16

Group: 1, 2, 3

Verdict: ACCEPTED

input
`1 1 1 1 1` view save

correct output
`0` view save

user output
`0` view save

Test 17

Group: 1, 3

Verdict: ACCEPTED

input
`10 600 800 0000000000 1110111111` view save

correct output
`1400` view save

user output
`1400` view save

Test 18

Group: 1, 3

Verdict: ACCEPTED

input
`10 300 599 1101001010 0011010110` view save

correct output
`1198` view save

user output
`1198` view save

Test 19

Group: 3

Verdict: ACCEPTED

input
`100000 300000000 500000000 010011101001001010010101101101...` view save

correct output
`10000000000000` view save

user output
`10000000000000` view save

Test 20

Group: 3

Verdict: ACCEPTED

input
`100000 60000 1000000000 110110111011010100001000011011...` view save

correct output
`3000000000` view save

user output
`3000000000` view save

Datatähti 2026 loppu

Bittijono

Code

Test details

Test 1 (public)

Test 2

Test 3

Test 4

Test 5

Test 6

Test 7

Test 8

Test 9

Test 10

Test 11

Test 12

Test 13

Test 14

Test 15

Test 16

Test 17

Test 18

Test 19

Test 20

Tasks

Submissions (xiaou0)