CSES - Datatähti 2023 alku

Submission details
Task:	Sadonkorjuu
Sender:	UpHereNorth
Submission time:	2022-10-31 02:47:22 +0200
Language:	C++ (C++17)
Status:	READY
Result:	100

Feedback
group	verdict	score
#1	ACCEPTED	33
#2	ACCEPTED	67

Test results
test	verdict	time	group
#1	ACCEPTED	0.01 s	1, 2	details
#2	ACCEPTED	0.01 s	1, 2	details
#3	ACCEPTED	0.01 s	1, 2	details
#4	ACCEPTED	0.01 s	1, 2	details
#5	ACCEPTED	0.01 s	1, 2	details
#6	ACCEPTED	0.01 s	1, 2	details
#7	ACCEPTED	0.35 s	2	details
#8	ACCEPTED	0.01 s	1, 2	details
#9	ACCEPTED	0.36 s	2	details
#10	ACCEPTED	0.01 s	1, 2	details
#11	ACCEPTED	0.40 s	2	details
#12	ACCEPTED	0.28 s	2	details
#13	ACCEPTED	0.29 s	2	details
#14	ACCEPTED	0.28 s	2	details
#15	ACCEPTED	0.01 s	1, 2	details
#16	ACCEPTED	0.01 s	1, 2	details
#17	ACCEPTED	0.01 s	1, 2	details
#18	ACCEPTED	0.01 s	1, 2	details
#19	ACCEPTED	0.01 s	1, 2	details
#20	ACCEPTED	0.01 s	1, 2	details
#21	ACCEPTED	0.27 s	2	details
#22	ACCEPTED	0.28 s	2	details
#23	ACCEPTED	0.28 s	2	details
#24	ACCEPTED	0.01 s	1, 2	details
#25	ACCEPTED	0.28 s	2	details
#26	ACCEPTED	0.01 s	1, 2	details
#27	ACCEPTED	0.26 s	2	details
#28	ACCEPTED	0.01 s	1, 2	details
#29	ACCEPTED	0.26 s	2	details
#30	ACCEPTED	0.01 s	1, 2	details
#31	ACCEPTED	0.27 s	2	details

Compiler report

input/code.cpp: In function 'll dfs_1(int, int, int)':
input/code.cpp:21:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   21 |     for(int i = 0; i < adj[cur].size(); ++i){
      |                    ~~^~~~~~~~~~~~~~~~~
input/code.cpp: In function 'void dfs_2(int, int, int, ll)':
input/code.cpp:49:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   49 |     for(int i = 0; i < adj[cur].size(); ++i){
      |                    ~~^~~~~~~~~~~~~~~~~
input/code.cpp: In function 'int main()':
input/code.cpp:88:10: warning: 'st' may be used uninitialized in this function [-Wmaybe-uninitialized]
   88 |     dfs_2(st, 0, 0, 0);
      |     ~~~~~^~~~~~~~~~~~~

Code

#include <bits/stdc++.h>

using namespace std;
using ll = long long;

const int N = 2e5+1;

vector<pair<int, int>> adj[N];
bool t[N];

vector<ll> dis_down[N];
ll dis_up[N];

ll mndown[N], smndown[N];

ll dfs_1(int cur, int pre, int c){

    dis_up[cur] = dis_up[pre] + c;
    if(!t[cur])dis_up[cur] = 0;

    for(int i = 0; i < adj[cur].size(); ++i){

        int nex = adj[cur][i].first;
        int c_nex = adj[cur][i].second;

        if(nex==pre){
            dis_down[cur].push_back(2e15);
            continue;
        }
        ll dis = dfs_1(nex, cur, c_nex);

        dis_down[cur].push_back(dis);

        if(dis <= mndown[cur]){
            smndown[cur] = mndown[cur];
            mndown[cur] = dis;
        }
    }

    if(!t[cur])mndown[cur] = smndown[cur] = 0;
    return mndown[cur] + c;
}


void dfs_2(int cur, int pre, int c, ll mnup){

    dis_up[cur] = min(dis_up[cur], mnup + c);

    for(int i = 0; i < adj[cur].size(); ++i){
        
        int nex = adj[cur][i].first;
        int c_nex = adj[cur][i].second;

        if(nex==pre)continue;

        ll child_min;
        if(dis_down[cur][i] == mndown[cur])child_min = smndown[cur];
        else child_min = mndown[cur];

        ll mn = min(child_min, dis_up[cur]);

        dfs_2(nex, cur, c_nex, mn);
    }
}


int main(){

    for(int i = 1; i < N; ++i){
        mndown[i] = 1e14;
        smndown[i] = 1e14;
    }

    int n;
    cin >> n;
    int st;
    for(int i = 1; i <= n; ++i){
        cin>>t[i];if(!t[i])st=i;
    }
    for(int i = 0; i < n - 1; ++i){
        int a, b, c;
        cin >> a >> b >> c;
        adj[a].push_back({b, c});
        adj[b].push_back({a, c});
    }

    dfs_1(st, 0, 0);
    dfs_2(st, 0, 0, 0);
    for(int i = 1; i <= n; ++i){
        // cout << i << " " << dis_up[i] << " " << mndown[i] << "\n";
    }

    ll ans = 0;
    for(int i = 1; i <= n; ++i){
        ans += min(dis_up[i], mndown[i]);
    }
    

    cout << ans << "\n";



}

Test details

Test 1

Group: 1, 2

Verdict: ACCEPTED

input
`1 0` view save

correct output
`0` view save

user output
`0` view save

Test 2

Group: 1, 2

Verdict: ACCEPTED

input
`5 0 0 0 0 0 1 2 1 2 3 2 3 4 3 ...` view save

correct output
`0` view save

user output
`0` view save

Test 3

Group: 1, 2

Verdict: ACCEPTED

input
`4 1 0 1 1 1 2 10 2 3 20 2 4 30` view save

correct output
`60` view save

user output
`60` view save

Test 4

Group: 1, 2

Verdict: ACCEPTED

input
`5 0 1 1 1 0 1 2 10 2 3 20 3 4 30 ...` view save

correct output
`80` view save

user output
`80` view save

Test 5

Group: 1, 2

Verdict: ACCEPTED

input
`5 0 1 0 1 1 1 2 1 2 3 5 3 4 3 ...` view save

correct output
`6` view save

user output
`6` view save

Test 6

Group: 1, 2

Verdict: ACCEPTED

input
`1000 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 ...` view save

correct output
`5506363` view save

user output
`5506363` view save

Test 7

Group: 2

Verdict: ACCEPTED

input
`200000 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 ...` view save

correct output
`1795118520` view save

user output
`1795118520` view save

Test 8

Group: 1, 2

Verdict: ACCEPTED

input
`1000 0 0 1 0 1 1 0 1 0 1 1 0 0 0 1 ...` view save

correct output
`293576` view save

user output
`293576` view save

Test 9

Group: 2

Verdict: ACCEPTED

input
`200000 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 ...` view save

correct output
`816932444` view save

user output
`816932444` view save

Test 10

Group: 1, 2

Verdict: ACCEPTED

input
`1000 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 ...` view save

correct output
`3089` view save

user output
`3089` view save

Test 11

Group: 2

Verdict: ACCEPTED

input
`200000 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 ...` view save

correct output
`40839` view save

user output
`40839` view save

Test 12

Group: 2

Verdict: ACCEPTED

input
`200000 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 ...` view save

correct output
`5683983203973` view save

user output
`5683983203973` view save

Test 13

Group: 2

Verdict: ACCEPTED

input
`200000 0 1 1 1 1 1 1 0 0 0 1 1 0 1 0 ...` view save

correct output
`58572993` view save

user output
`58572993` view save

Test 14

Group: 2

Verdict: ACCEPTED

input
`200000 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 ...` view save

correct output
`32755` view save

user output
`32755` view save

Test 15

Group: 1, 2

Verdict: ACCEPTED

input
`1000 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 ...` view save

correct output
`126238345` view save

user output
`126238345` view save

Test 16

Group: 1, 2

Verdict: ACCEPTED

input
`1000 0 0 0 1 0 1 1 1 0 0 1 0 1 1 0 ...` view save

correct output
`278678` view save

user output
`278678` view save

Test 17

Group: 1, 2

Verdict: ACCEPTED

input
`1000 1 0 0 0 1 0 0 0 1 0 0 0 0 0 0 ...` view save

correct output
`34929` view save

user output
`34929` view save

Test 18

Group: 1, 2

Verdict: ACCEPTED

input
`1000 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 ...` view save

correct output
`1543963` view save

user output
`1543963` view save

Test 19

Group: 1, 2

Verdict: ACCEPTED

input
`1000 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 ...` view save

correct output
`39606` view save

user output
`39606` view save

Test 20

Group: 1, 2

Verdict: ACCEPTED

input
`1000 1 0 1 0 1 0 0 0 0 1 1 0 0 0 1 ...` view save

correct output
`321598` view save

user output
`321598` view save

Test 21

Group: 2

Verdict: ACCEPTED

input
`200000 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 ...` view save

correct output
`978670626` view save

user output
`978670626` view save

Test 22

Group: 2

Verdict: ACCEPTED

input
`200000 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 ...` view save

correct output
`375218` view save

user output
`375218` view save

Test 23

Group: 2

Verdict: ACCEPTED

input
`200000 1 1 1 1 0 0 0 0 0 1 0 1 0 1 1 ...` view save

correct output
`60422556` view save

user output
`60422556` view save

Test 24

Group: 1, 2

Verdict: ACCEPTED

input
`1000 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 ...` view save

correct output
`291990` view save

user output
`291990` view save

Test 25

Group: 2

Verdict: ACCEPTED

input
`200000 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 ...` view save

correct output
`59607954` view save

user output
`59607954` view save

Test 26

Group: 1, 2

Verdict: ACCEPTED

input
`1000 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 ...` view save

correct output
`990` view save

user output
`990` view save

Test 27

Group: 2

Verdict: ACCEPTED

input
`200000 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 ...` view save

correct output
`199982` view save

user output
`199982` view save

Test 28

Group: 1, 2

Verdict: ACCEPTED

input
`1000 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 ...` view save

correct output
`7987` view save

user output
`7987` view save

Test 29

Group: 2

Verdict: ACCEPTED

input
`200000 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 ...` view save

correct output
`3137875` view save

user output
`3137875` view save

Test 30

Group: 1, 2

Verdict: ACCEPTED

input
`1000 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 ...` view save

correct output
`4657693` view save

user output
`4657693` view save

Test 31

Group: 2

Verdict: ACCEPTED

input
`200000 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 ...` view save

correct output
`1652889357` view save

user output
`1652889357` view save

Datatähti 2023 alku

Sadonkorjuu

Compiler report

Code

Test details

Test 1

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

Test 21

Test 22

Test 23

Test 24

Test 25

Test 26

Test 27

Test 28

Test 29

Test 30

Test 31

Tasks

Submissions (UpHereNorth)