Submission #745214

#	Time	Username	Problem	Language	Result	Execution time	Memory
745214		1075508020060209tc	Railway Trip 2 (JOI22_ho_t4)	C++14	25 / 100	256 ms	44600 KiB

Main

#include <bits/stdc++.h>
using namespace std;
#define int long long
#define X first
#define Y second
int n;int K;
int m;
int Q;
vector<int>rts[200005];
int jmp[21][200005];
int rjmp[21][200005];

signed main(){
cin>>n>>K;
cin>>m;
for(int i=1;i<=m;i++){
    int a;int b;
    cin>>a>>b;
    rts[a].push_back(b);
}

int mxv=0;
for(int i=1;i<=n;i++){
    for(int j=0;j<rts[i].size();j++){
        mxv=max(mxv,rts[i][j]);
    }
    jmp[0][i]=max(i,mxv);
}
mxv=n+1;
for(int i=n;i>=1;i--){
    for(int j=0;j<rts[i].size();j++){
        mxv=min(mxv,rts[i][j]);
    }
    rjmp[0][i]=min(i,mxv);
}

for(int i=1;i<=20;i++){
    for(int j=1;j<=n;j++){
        jmp[i][j]=jmp[i-1][jmp[i-1][j]];
        rjmp[i][j]=rjmp[i-1][rjmp[i-1][j]];
    }
}
cin>>Q;
while(Q--){
    int stp;int enp;
    cin>>stp>>enp;
    int ans=0;
    if(stp<enp){
    int nw=stp;
    for(int i=20;i>=0;i--){
        if(jmp[i][nw]<enp){
            ans+=(1<<i);
            nw=jmp[i][nw];
        }
    }
    if(jmp[0][nw]<enp){
        ans=-1;
    }else{
        ans++;
    }
    }else{
    int nw=stp;
    for(int i=20;i>=0;i--){
        if(rjmp[i][nw]>enp){
            ans+=(1<<i);
            nw=rjmp[i][nw];
        }
    }
    if(rjmp[0][nw]>enp){
        ans=-1;
    }else{
        ans++;
    }
   // cout<<nw<<" ";
    }
    cout<<ans<<endl;

}





}

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:24:18: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   24 |     for(int j=0;j<rts[i].size();j++){
      |                 ~^~~~~~~~~~~~~~
Main.cpp:31:18: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   31 |     for(int j=0;j<rts[i].size();j++){
      |                 ~^~~~~~~~~~~~~~

• Subtask 1: 0 / 8
• Subtask 2: 0 / 8
• Subtask 3: 0 / 11
• Subtask 4: 25 / 25
• Subtask 5: 0 / 35
• Subtask 6: 0 / 13