oj.uz

Submission #1030541

# Submission time Handle Problem Language Result Execution time Memory
1030541 2024-07-22T06:36:50 Z 김은성(#10955) Designated Cities (JOI19_designated_cities) C++17
0 / 100
 2000 ms 34216 KB 
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
ll ans[200009];
bool ch[200009];
const ll INF = 0x3fffffffffffffff;
vector<pair<int, ll> > graph[200009];
vector<pair<int, ll> > tree[200009];
ll depth[200009], sum = 0;
int par[200009];
void construct_tree(int v){
    ch[v] = 1;
    for(int i=0; i<graph[v].size(); i++){
        int u = graph[v][i].first;
        if(!ch[u]){
            sum += graph[v][i].second;
            tree[v].push_back(graph[v][i]);
            par[u] = v;
            construct_tree(u);
        }
    }
}
int deepest_vertex(int v, ll d){
    depth[v] = d;
    ch[v] = 1;
    int ans = v;
    for(int i=0; i<tree[v].size(); i++){
        int u = tree[v][i].first;
        if(!ch[u]){
            int x = deepest_vertex(u, d+tree[v][i].second);
            if(depth[x] > depth[ans])
                ans = x;
        }
    }
    return ans;
}
void delete_edge(int v, int r){
    int p = par[v];
    while(v != r){
        for(int i=0; i<tree[p].size(); i++){
            if(tree[p][i].first == v)
                tree[p][i].second = 0;
        }
        v = p;
        p = par[v];
    }
}
int main(){
    int n, i, j, a, b, q, v;
    ll c, d;
    scanf("%d", &n);
    for(i=1; i<n; i++){
        scanf("%d %d %lld %lld", &a, &b, &c, &d);
        graph[a].push_back(make_pair(b, c));
        graph[b].push_back(make_pair(a, d));
    }
    for(i=1; i<=n; i++)
        ans[i] = INF;
    ll mn = INF;
    int opt = 0;
    for(i=1; i<=n; i++){
        for(j=1; j<=n; j++){
            tree[j].clear();
            ch[j] = 0;
        }
        sum = 0;
        construct_tree(i);
        ans[1] = min(ans[1], sum);
        if(graph[i].size()!=1)
            continue;
        int v = deepest_vertex(i, 0);
        if(sum < mn){
            mn = sum;
            opt = i;
        }
    }
   // printf("opt=%d\n", opt);
    for(j=1; j<=n; j++){
        tree[j].clear();
        ch[j] = 0;
    }
    sum = 0;
    construct_tree(opt);
    for(j=1; j<=n; j++){
        ans[j] = min(ans[j], sum);
        for(int k=1; k<=n; k++)
            ch[k]=0;
        int v = deepest_vertex(opt, 0);
        sum -= depth[v];
        delete_edge(v, opt);
    }
    scanf("%d", &q);
    while(q--){
        scanf("%d", &v);
        printf("%lld\n", ans[v]);
    }
    return 0;
}

Compilation message

designated_cities.cpp: In function 'void construct_tree(int)':
designated_cities.cpp:13:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   13 |     for(int i=0; i<graph[v].size(); i++){
      |                  ~^~~~~~~~~~~~~~~~
designated_cities.cpp: In function 'int deepest_vertex(int, ll)':
designated_cities.cpp:27:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   27 |     for(int i=0; i<tree[v].size(); i++){
      |                  ~^~~~~~~~~~~~~~~
designated_cities.cpp: In function 'void delete_edge(int, int)':
designated_cities.cpp:40:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   40 |         for(int i=0; i<tree[p].size(); i++){
      |                      ~^~~~~~~~~~~~~~~
designated_cities.cpp: In function 'int main()':
designated_cities.cpp:71:13: warning: unused variable 'v' [-Wunused-variable]
   71 |         int v = deepest_vertex(i, 0);
      |             ^
designated_cities.cpp:51:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   51 |     scanf("%d", &n);
      |     ~~~~~^~~~~~~~~~
designated_cities.cpp:53:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   53 |         scanf("%d %d %lld %lld", &a, &b, &c, &d);
      |         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
designated_cities.cpp:92:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   92 |     scanf("%d", &q);
      |     ~~~~~^~~~~~~~~~
designated_cities.cpp:94:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   94 |         scanf("%d", &v);
      |         ~~~~~^~~~~~~~~~

Subtask #1
0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 9820 KB Output is correct
2 Correct 4 ms 9820 KB Output is correct
3 Correct 4 ms 9820 KB Output is correct
4 Correct 4 ms 9852 KB Output is correct
5 Incorrect 6 ms 9820 KB Output isn't correct
6 Halted 0 ms 0 KB -

Subtask #2
0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 9820 KB Output is correct
2 Execution timed out 2086 ms 34212 KB Time limit exceeded
3 Halted 0 ms 0 KB -

Subtask #3
0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 9820 KB Output is correct
2 Execution timed out 2075 ms 34216 KB Time limit exceeded
3 Halted 0 ms 0 KB -

Subtask #4
0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 9820 KB Output is correct
2 Correct 4 ms 9820 KB Output is correct
3 Correct 4 ms 9820 KB Output is correct
4 Correct 4 ms 9852 KB Output is correct
5 Incorrect 6 ms 9820 KB Output isn't correct
6 Halted 0 ms 0 KB -

Subtask #5
0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 9820 KB Output is correct
2 Execution timed out 2086 ms 34212 KB Time limit exceeded
3 Halted 0 ms 0 KB -

Subtask #6
0 / 44.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 9820 KB Output is correct
2 Correct 4 ms 9820 KB Output is correct
3 Correct 4 ms 9820 KB Output is correct
4 Correct 4 ms 9852 KB Output is correct
5 Incorrect 6 ms 9820 KB Output isn't correct
6 Halted 0 ms 0 KB -