Submission #764245

#	Time	Username	Problem	Language	Result	Execution time	Memory
764245		Dan4Life	Minerals (JOI19_minerals)	C++17	0 / 100	1 ms	336 KiB

minerals

#include "minerals.h"
#include <bits/stdc++.h>
using namespace std;
#define pb push_back
#define sz(a) (int)a.size()
#define all(a) begin(a),end(a)
int n;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
 
set<int> S;
void dnc(vector<int> l, vector<int> r, bool d){
    if(sz(l)<1) return;
    if(sz(l)==1) return void(Answer(l[0],r[0]));
    int mid = sz(l)/2, x, tot;
    vector<int> v[2],w[2]; 
    for(int i : {0,1}) v[i].clear(),w[i].clear(); 
    if(d==1){
      for(int i = 0; i < mid; i++) tot=Query(l[i]),S.insert(l[i]);
    }
    else{
      for(int i = mid; i<sz(l); i++) tot=Query(l[i]), S.erase(l[i]);
    }
    for(int i = 0; i < sz(l); i++) v[i>=mid].pb(l[i]);
    shuffle(all(r),rng);
    for(int i : r) x = Query(i), w[x==tot].pb(i), Query(i);
    dnc(v[0],w[0],0);
    for(auto u : S) Query(u); S.clear();
    dnc(v[1],w[1],1);
}
 
void Solve(int N) {
    n = N;
    vector<int> v(2*n,0),w[2],z; int p=0;
    iota(all(v),1); shuffle(all(v),rng);
    for(int i = 0; i < sz(v); i++){
      int x = Query(v[i]);
      if(x!=p) w[0].pb(v[i]), z.pb(v[i]), S.insert(v[i]),p=x;
      else w[1].pb(v[i]),p=Query(v[i]);
    }
    dnc(w[0],w[1],1);
}

Compilation message (stderr)

minerals.cpp: In function 'void dnc(std::vector<int>, std::vector<int>, bool)':
minerals.cpp:27:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   27 |     for(auto u : S) Query(u); S.clear();
      |     ^~~
minerals.cpp:27:31: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   27 |     for(auto u : S) Query(u); S.clear();
      |                               ^
minerals.cpp:25:37: warning: 'tot' may be used uninitialized in this function [-Wmaybe-uninitialized]
   25 |     for(int i : r) x = Query(i), w[x==tot].pb(i), Query(i);
      |                                    ~^~~~~

• Subtask 1: 0 / 6
• Subtask 2: 0 / 25
• Subtask 3: 0 / 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