oj.uz

Submission #990269

# Submission time Handle Problem Language Result Execution time Memory
990269 2024-05-30T05:08:24 Z imarn Joker (BOI20_joker) C++14
0 / 100
 1 ms 4444 KB 
#include<bits/stdc++.h>
#define ll long long
#define pii pair<int,ll>
#define f first
#define s second
#define pb push_back
#define all(x) x.begin(),x.end()
using namespace std;
const int mxn=4e5+5;
vector<pii>edge;
int pr[mxn]{0},m,n;
int dp[mxn]{0};
int sz[mxn]{0};
stack<pii>st;
void rollback(int x){
    while(st.size()>x){
        pr[st.top().f]=st.top().f;
        sz[st.top().s]-=sz[st.top().f];
        st.pop();
    }
}
int get(int r){
    return pr[r]==r?r:get(pr[r]);
}
void uni(int a,int b){
    a=get(a),b=get(b);
    if(a==b)return;
    if(sz[a]>sz[b])swap(a,b);
    pr[a]=b;sz[b]+=sz[a];
    st.push({a,b});
}
void solve(int l1,int r1,int l2,int r2){
    if(l2==r2){
        for(int i=l1;i<=r1;i++)dp[i]=l2;
        return;
    }
    if(l1>r1)return;
    int md=(l1+r1)>>1;
    int pv1=st.size();
    if(r1>=l2){
        uni(edge[md-1].f,edge[md-1].s+n);
        uni(edge[md-1].f+n,edge[md-1].s);
        int pv2=st.size(),md2=-1;
        for(int i=md+1;i<=r2;i++){
            uni(edge[i-1].f,edge[i-1].s+n);
            uni(edge[i-1].f+n,edge[i-1].s);
            if(get(edge[i-1].f)==get(edge[i-1].f+n)){md2=i;break;}
        }dp[md]=md2;
        rollback(pv1);
        for(int i=md;i<=l2-1;i++){
            uni(edge[i-1].f,edge[i-1].s+n);
            uni(edge[i-1].f+n,edge[i-1].s);
        }solve(l1,md-1,l2,md2);
        rollback(pv1);
        for(int i=r1+1;i<=md2-1;i++){
            uni(edge[i-1].f,edge[i-1].s+n);
            uni(edge[i-1].f+n,edge[i-1].s);
        }solve(md+1,r1,md2,r2);
        rollback(pv1);
    }
    else {
        for(int i=r1;i>=md;i--){
            uni(edge[i-1].f,edge[i-1].s+n);
            uni(edge[i-1].f+n,edge[i-1].s);
        }int pv2=st.size(),md2=-1;
        for(int i=l2;i<=r2;i++){
            uni(edge[i-1].f,edge[i-1].s+n);
            uni(edge[i-1].f+n,edge[i-1].s);
            if(get(edge[i-1].f)==get(edge[i-1].f+n)){md2=i;break;}
        }dp[md]=md2;rollback(pv2);
        solve(l1,md-1,l2,md2);
        rollback(pv1);
        for(int i=l2;i<=md2-1;i++){
            uni(edge[i-1].f,edge[i-1].s+n);
            uni(edge[i-1].f+n,edge[i-1].s);
        }solve(md+1,r1,md2,r2);
        rollback(pv1);
    }
}
int main(){
    ios_base::sync_with_stdio(0);cin.tie(0);
    int q;cin>>n>>m>>q;iota(pr,pr+2*n+1,0);
    for(int i=0;i<m;i++){
        int u,v;cin>>u>>v;edge.pb({u,v});
    }edge.pb({1,1});
    solve(1,m,1,m+1);
    while(q--){
        int l,r;cin>>l>>r;
        cout<<(r<dp[l]?"YES\n":"NO\n");
    }
}

Compilation message

Joker.cpp: In function 'void rollback(int)':
Joker.cpp:16:20: warning: comparison of integer expressions of different signedness: 'std::stack<std::pair<int, long long int> >::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   16 |     while(st.size()>x){
      |           ~~~~~~~~~^~
Joker.cpp: In function 'void solve(int, int, int, int)':
Joker.cpp:43:13: warning: unused variable 'pv2' [-Wunused-variable]
   43 |         int pv2=st.size(),md2=-1;
      |             ^~~

Subtask #1
0 / 6.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 4444 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0 / 8.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 4444 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 25.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 4444 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 4444 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
0 / 22.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 4444 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #6
0 / 29.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 4444 KB Output isn't correct
2 Halted 0 ms 0 KB -