Submission #1044527

#	Time	Username	Problem	Language	Result	Execution time	Memory
1044527		beaconmc	The Potion of Great Power (CEOI20_potion)	C++14	38 / 100	3096 ms	118752 KiB

potion

#include <bits/stdc++.h>
 
typedef int ll;
#define FOR(i,x,y) for(ll i=x; i<y; i++)
#define FORNEG(i,x,y) for(ll i=x; i>y; i--)
 
using namespace std;
 
 
 
vector<ll> h;
vector<ll> a;
vector<ll> b;

vector<vector<ll>> changes[100001];
vector<set<ll>> lotchange[100001];
 
void init(int N, int D, int H[]) {
    FOR(i,0,N) h.push_back(H[i]);
}
 
void curseChanges(int U, int A[], int B[]) {
    vector<set<ll>> tempedges;
    tempedges.resize(100001);
    FOR(i,0,U){



        if (tempedges[A[i]].find(B[i]) != tempedges[A[i]].end()){
            changes[A[i]].push_back({i, B[i]});
            tempedges[A[i]].erase(B[i]);
        }
        else{
            changes[A[i]].push_back({i, B[i]});
            tempedges[A[i]].insert(B[i]);
        }

        if (tempedges[B[i]].find(A[i]) != tempedges[B[i]].end()){
            changes[B[i]].push_back({i, A[i]});
            tempedges[B[i]].erase(A[i]);
        } 
        else{
            changes[B[i]].push_back({i, A[i]});
            tempedges[B[i]].insert(A[i]);
        }
        if ((changes[A[i]].size()-1)%50==0){
            lotchange[A[i]].push_back(tempedges[A[i]]);
        }
        if ((changes[B[i]].size()-1)%50==0){
            lotchange[B[i]].push_back(tempedges[B[i]]);
        }


    }
}
 
int mindiff(set<ll>&a, set<ll>&b){
 
    ll ans = 1000000000;
    vector<ll> A,B;
 
    for (auto&i : a) A.push_back(h[i]);
    for (auto&i : b) B.push_back(h[i]);
 
    sort(A.begin(), A.end());
    sort(B.begin(), B.end());

    ll l=0,r=0;
    while (l<A.size() && r<B.size()){
        ans = min(ans, abs(A[l] - B[r]));
        if (A[l] < B[r]) l++;
        else r++;
    }
    return ans;
 
    return ans;
}
 
int question(int x, int y, int v) {

    v--;
    ll ans = 1000000000;


    ll pos = upper_bound(changes[x].begin(), changes[x].end(), vector<ll>{v, 1000000000})-changes[x].begin();
    pos--;
    

    set<ll> X;
    if (pos >= 0){
        X=lotchange[x][pos/50];

        FOR(i, (pos/50)*50+1, pos+1){

            ll temp = changes[x][i][1];

            if (X.find(temp) != X.end()) X.erase(temp);
            else X.insert(temp);

        }
    }


    pos = upper_bound(changes[y].begin(), changes[y].end(), vector<ll>{v, 1000000000})-changes[y].begin();
    pos--;
    

    set<ll> Y;
    if (pos >= 0){
        Y=lotchange[y][pos/50];

        FOR(i, (pos/50)*50+1, pos+1){

            ll temp = changes[y][i][1];

            if (Y.find(temp) != Y.end()) Y.erase(temp);
            else Y.insert(temp);

        }
    }






    return mindiff(X,Y);
}

Compilation message (stderr)

potion.cpp: In function 'int mindiff(std::set<int>&, std::set<int>&)':
potion.cpp:69:13: warning: comparison of integer expressions of different signedness: 'll' {aka 'int'} and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   69 |     while (l<A.size() && r<B.size()){
      |            ~^~~~~~~~~
potion.cpp:69:27: warning: comparison of integer expressions of different signedness: 'll' {aka 'int'} and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   69 |     while (l<A.size() && r<B.size()){
      |                          ~^~~~~~~~~
potion.cpp: In function 'int question(int, int, int)':
potion.cpp:82:8: warning: unused variable 'ans' [-Wunused-variable]
   82 |     ll ans = 1000000000;
      |        ^~~

• Subtask 1: 0 / 0
• Subtask 2: 17 / 17
• Subtask 3: 0 / 14
• Subtask 4: 0 / 18
• Subtask 5: 21 / 21
• Subtask 6: 0 / 30