Submission #707776

#	Time	Username	Problem	Language	Result	Execution time	Memory
707776		victor_gao	Minerals (JOI19_minerals)	C++17	40 / 100	22 ms	2260 KiB

minerals

#include"minerals.h"
#include<bits/stdc++.h>
using namespace std;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
vector<int>arr;
void Merge(int l,int r,vector<int>have){
    if (l==r){
     //   cout<<"match "<<arr[l-1]<<" "<<have[0]<<'\n';
        Answer(arr[l-1],have[0]);
        return;
    }
    int mid=(l+r)>>1,last;
    vector<int>L,R;
    for (int i=l-1;i<mid;i++)
        last=Query(arr[i]);
    for (auto i:have){
        int now=Query(i);
        if (now==last)
            L.push_back(i);
        else R.push_back(i);
        Query(i);
    }
    Merge(mid+1,r,R);
    for (int i=l-1;i<mid;i++)
        Query(arr[i]);
    Merge(l,mid,L);
}
void Solve(int N){
    vector<int>qry;
    int last=-1;
    for (int i=1;i<=2*N;i++){
        int now=Query(i);
        if (now==last){
            Query(i);
            qry.push_back(i);
        }
        else {
            arr.push_back(i);
            last=now;
        }
    }
    for (int i=1;i<=N;i++)
        Query(arr[i-1]);
    //for (auto i:arr) cout<<i<<" ";
    //cout<<'\n';
    //for (auto i:qry) cout<<i<<" ";
    //cout<<'\n';
    Merge(1,N,qry);
}
/*
g++ -std=gnu++14 -O2 -o grader grader.cpp minerals.cpp
./grader.exe
4
1 5
2 6
3 4
7 8
*/

Compilation message (stderr)

minerals.cpp: In function 'void Merge(int, int, std::vector<int>)':
minerals.cpp:18:9: warning: 'last' may be used uninitialized in this function [-Wmaybe-uninitialized]
   18 |         if (now==last)
      |         ^~

• Subtask 1: 6 / 6
• Subtask 2: 25 / 25
• Subtask 3: 9 / 9
• Subtask 4: 0 / 30
• Subtask 5: 0 / 5
• Subtask 6: 0 / 5
• Subtask 7: 0 / 5
• Subtask 8: 0 / 5
• Subtask 9: 0 / 10