oj.uz

Submission #940923

# Submission time Handle Problem Language Result Execution time Memory
940923 2024-03-08T02:17:20 Z guagua0407 Capital City (JOI20_capital_city) C++17
30 / 100
 236 ms 20968 KB 
//#pragma GCC optimize("O3")
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define pii pair<int,int>
#define f first
#define s second
#define all(x) x.begin(),x.end()
#define _ ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);

int dx[4]={0,0,1,-1};
int dy[4]={1,-1,0,0};

void setIO(string s) {
    freopen((s + ".in").c_str(), "r", stdin);
    freopen((s + ".out").c_str(), "w", stdout);
}

const int mxn=2e5+5;
const int inf=1e9;
vector<int> adj[mxn];
bool visited[mxn];
int c[mxn];
vector<int> segtree(mxn*4,inf);
int n,k;

void update(int pos,int val,int l=1,int r=n,int v=1){
    if(l==r){
        segtree[v]=min(segtree[v],val);
        return;
    }
    int mid=(l+r)/2;
    if(pos<=mid) update(pos,val,l,mid,v*2);
    else update(pos,val,mid+1,r,v*2+1);
    segtree[v]=min(segtree[v*2],segtree[v*2+1]);
}

int query(int tl,int tr,int l=1,int r=n,int v=1){
    if(r<tl or tr<l){
        return inf;
    }
    if(tl<=l and r<=tr){
        return segtree[v];
    }
    int mid=(l+r)/2;
    return min(query(tl,min(mid,tr),l,mid,v*2),query(max(mid+1,tl),tr,mid+1,r,v*2+1));
}

int main() {_
    cin>>n>>k;
    for(int i=0;i<n-1;i++){
        int a,b;
        cin>>a>>b;
        adj[a].push_back(b);
        adj[b].push_back(a);
    }
    for(int i=1;i<=n;i++){
        cin>>c[i];
        c[i]--;
    }
    int st;
    for(int i=1;i<=n;i++){
        if((int)adj[i].size()<=1) st=i;
    }
    vector<int> ord;
    ord.push_back(-1);
    queue<int> q;
    q.push(st);
    while(!q.empty()){
        int v=q.front();
        q.pop();
        visited[v]=true;
        ord.push_back(v);
        for(auto u:adj[v]){
            if(visited[u]) continue;
            q.push(u);
        }
    }
    vector<int> mnn(k),mxx(k);
    {
        vector<int> mn(k,inf),mx(k,-1);
        for(int i=1;i<ord.size();i++){
            mx[c[ord[i]]]=max(mx[c[ord[i]]],i);
            mn[c[ord[i]]]=min(mn[c[ord[i]]],i);
        }
        for(int i=1;i<ord.size();i++){
            int C=c[ord[i]];
            int val=query(mn[C],i);
            val=min(val,mn[C]);
            if(i==mx[C]){
                mnn[C]=val;
            }
            update(i,val);
        }
    }
    reverse(ord.begin()+1,ord.end());
    segtree=vector<int>(mxn*4,inf);
    {
        vector<int> mn(k,inf),mx(k,-1);
        for(int i=1;i<ord.size();i++){
            int C=c[ord[i]];
            mx[C]=max(mx[C],i);
            mn[C]=min(mn[C],i);
        }
        for(int i=1;i<ord.size();i++){
            int C=c[ord[i]];
            int val=query(mn[C],i);
            val=min(val,mn[C]);
            if(i==mx[C]){
                mxx[C]=val;
            }
            update(i,val);
        }
    }
    reverse(ord.begin()+1,ord.end());
    vector<int> mn(k,inf),mx(k,-1);
    for(int i=1;i<ord.size();i++){
        mx[c[ord[i]]]=max(mx[c[ord[i]]],i);
        mn[c[ord[i]]]=min(mn[c[ord[i]]],i);
    }
    for(int i=0;i<k;i++){
        mxx[i]=n-mxx[i]+1;
    }
    vector<int> pre(ord.size());
    for(int i=1;i<ord.size();i++){
        int C=c[ord[i]];
        pre[i]=pre[i-1];
        if(i==mx[C]){
            pre[i]++;
        }
    }
    int ans=inf;
    for(int i=0;i<k;i++){
        assert(mnn[i]>=1 and mnn[i]<=n and mxx[i]>=1 and mxx[i]<=n);
        ans=min(ans,pre[mxx[i]]-pre[mnn[i]-1]-1);
    }
    cout<<ans<<'\n';
    return 0;
}
//maybe its multiset not set
//yeeorz
//laborz

Compilation message

capital_city.cpp: In function 'int main()':
capital_city.cpp:82:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   82 |         for(int i=1;i<ord.size();i++){
      |                     ~^~~~~~~~~~~
capital_city.cpp:86:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   86 |         for(int i=1;i<ord.size();i++){
      |                     ~^~~~~~~~~~~
capital_city.cpp:100:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  100 |         for(int i=1;i<ord.size();i++){
      |                     ~^~~~~~~~~~~
capital_city.cpp:105:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  105 |         for(int i=1;i<ord.size();i++){
      |                     ~^~~~~~~~~~~
capital_city.cpp:117:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  117 |     for(int i=1;i<ord.size();i++){
      |                 ~^~~~~~~~~~~
capital_city.cpp:125:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  125 |     for(int i=1;i<ord.size();i++){
      |                 ~^~~~~~~~~~~
capital_city.cpp: In function 'void setIO(std::string)':
capital_city.cpp:15:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   15 |     freopen((s + ".in").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
capital_city.cpp:16:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   16 |     freopen((s + ".out").c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
0 / 1.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 12124 KB Output is correct
2 Correct 4 ms 12124 KB Output is correct
3 Correct 4 ms 12004 KB Output is correct
4 Correct 4 ms 12124 KB Output is correct
5 Correct 4 ms 12124 KB Output is correct
6 Correct 4 ms 12124 KB Output is correct
7 Incorrect 4 ms 12012 KB Output isn't correct
8 Halted 0 ms 0 KB -

Subtask #2
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 12124 KB Output is correct
2 Correct 4 ms 12124 KB Output is correct
3 Correct 4 ms 12004 KB Output is correct
4 Correct 4 ms 12124 KB Output is correct
5 Correct 4 ms 12124 KB Output is correct
6 Correct 4 ms 12124 KB Output is correct
7 Incorrect 4 ms 12012 KB Output isn't correct
8 Halted 0 ms 0 KB -

Subtask #3
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 197 ms 20968 KB Output is correct
2 Correct 169 ms 20912 KB Output is correct
3 Correct 185 ms 20932 KB Output is correct
4 Correct 169 ms 20936 KB Output is correct
5 Correct 200 ms 20732 KB Output is correct
6 Correct 168 ms 20936 KB Output is correct
7 Correct 184 ms 20736 KB Output is correct
8 Correct 183 ms 20704 KB Output is correct
9 Correct 186 ms 20164 KB Output is correct
10 Correct 185 ms 20056 KB Output is correct
11 Correct 209 ms 20168 KB Output is correct
12 Correct 185 ms 20164 KB Output is correct
13 Correct 187 ms 20216 KB Output is correct
14 Correct 236 ms 20156 KB Output is correct
15 Correct 191 ms 20164 KB Output is correct
16 Correct 186 ms 20164 KB Output is correct
17 Correct 200 ms 20248 KB Output is correct
18 Correct 187 ms 20164 KB Output is correct
19 Correct 194 ms 20164 KB Output is correct
20 Correct 194 ms 20272 KB Output is correct
21 Correct 4 ms 12124 KB Output is correct

Subtask #4
0 / 59.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 12124 KB Output is correct
2 Correct 4 ms 12124 KB Output is correct
3 Correct 4 ms 12004 KB Output is correct
4 Correct 4 ms 12124 KB Output is correct
5 Correct 4 ms 12124 KB Output is correct
6 Correct 4 ms 12124 KB Output is correct
7 Incorrect 4 ms 12012 KB Output isn't correct
8 Halted 0 ms 0 KB -