Submission #1072895

#	Time	Username	Problem	Language	Result	Execution time	Memory
1072895		SiliconSquared	Minerals (JOI19_minerals)	C++14	75 / 100	21 ms	3320 KiB

minerals

#include "minerals.h"

using namespace std;
#include <vector>
#include <iostream>

int query(int x){
    return Query(x+1);
}

int n;
struct mineral{
    int a,b;
    bool f;
    mineral(){a=0;b=n;f=true;}
};
vector<mineral> v;
vector<int> l;
vector<int> r;

void Solve(int N) {
    int a,b,c,q,x,y,z;
    n=N;
    v.resize(n,mineral());
    b=0;
    for (int i=0;i<2*n;i++){
        a=query(i);
        if (a>b){
            l.push_back(i);
            b=a;
        }else{
            r.push_back(i);
        }
    }
    for (int i=n/2;i<n;i++){c=query(l[i]);v[i].f=false;}
    vector<pair<int,int>> w;
    vector<pair<int,int>> w2;
    w.push_back({0,N});
    while (!w.empty()){
    //     cout<<'\n';
    // for (int i=0;i<n;i++){cout<<l[i]+1<<'\t';}cout<<'\n';
    // for (int i=0;i<n;i++){cout<<v[i].f<<'\t';}cout<<'\n';
        for (int i=0;i<n;i++){
            if (v[i].a+1==v[i].b){continue;}
            q=query(r[i]);
            if (c!=q){
                v[i].a=(v[i].a+v[i].b)/2;
                c=q;
            }else{
                v[i].b=(v[i].a+v[i].b)/2;
            }//cerr<<r[i]+1<<':'<<v[i].a<<','<<v[i].b<<';';
        }
        q=w.size();
        for (int i=0;i<q;i++){
            a=w[w.size()-1].first;
            b=w[w.size()-1].second;
            w.pop_back();
            if (a+1==b || a==b){continue;}
            y=(a+b)/2;
            x=(a+y)/2;
            z=(y+b)/2;
            for (int j=x;j<y;j++){
                c=query(l[j]);
                v[j].f=!v[j].f;
            }
            for (int j=y;j<z;j++){
                c=query(l[j]);
                v[j].f=!v[j].f;
            }
            w2.push_back({a,y});
            w2.push_back({y,b});
        }
        w=w2;
        w2.clear();
    }
    for (int i=0;i<n;i++){
        Answer(r[i]+1,l[v[i].a]+1);
    }
}

Compilation message (stderr)

minerals.cpp: In function 'void Solve(int)':
minerals.cpp:46:13: warning: 'c' may be used uninitialized in this function [-Wmaybe-uninitialized]
   46 |             if (c!=q){
      |             ^~

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