Submission #660718

#	Time	Username	Problem	Language	Result	Execution time	Memory
660718		Lobo	The Potion of Great Power (CEOI20_potion)	C++17	38 / 100	753 ms	262144 KiB

potion

#include<bits/stdc++.h>
using namespace std;
const long long inf = (long long) 1e18 + 10;
const int inf1 = (int) 1e9 + 10;
// #define int long long
#define ll long long
#define dbl long double
#define endl '\n'
#define sc second
#define fr first
#define mp make_pair
#define pb push_back
#define all(x) x.begin(), x.end()

const int maxn = 2e5+10;

int n, a[maxn], idord[maxn];
vector<pair<int,int>> ord;

vector<pair<int,int>> g[maxn];
vector<pair<int,vector<int>>> frds[maxn];
const int BC = 1;

void init(int N, int D, int H[]) {
    n = N;
    for(int i = 0; i < n; i++) {
        ord.pb(mp(H[i],i));
    }
    sort(all(ord));
    for(int i = 0; i < n; i++) {
        idord[ord[i].sc] = i;
        a[i] = ord[i].fr;
    }
}

void curseChanges(int U, int A[], int B[]) {
    for(int i = 0; i < U; i++) {
        int u = idord[A[i]];
        int v = idord[B[i]];

        g[u].pb(mp(i+1,v));
        g[v].pb(mp(i+1,u));
    }

    for(int i = 0; i < n; i++) {
        set<int> st;
        int cnt = 0;
        frds[i].pb(mp(0,vector<int>{}));
        for(auto X : g[i]) {
            int j = X.sc;
            int id = X.fr;
            if(st.count(j)) st.erase(j);
            else st.insert(j);

            if(++cnt == BC || g[i].back().fr == id) {
                frds[i].pb(mp(id,vector<int>{}));
                for(auto x : st) {
                    frds[i].back().sc.pb(x);
                }
                cnt = 0;
            }
        }
        frds[i].pb(mp(U+1,vector<int>{}));

        // cout << i << "  " << a[i] << endl;
        // for(auto x : frds[i]) {
        //     cout << " " << x.fr << endl;
        // }
    }
}

int question(int x, int y, int v) {
    x = idord[x];
    y = idord[y];

    vector<int> vcx;
    vcx = prev(lower_bound(all(frds[x]),mp(v+1,vector<int>{})))->sc;
    // cout << x << " " << " x " << prev(lower_bound(all(frds[x]),mp(v+1,vector<int>{})))->fr << endl;
    vector<int> vcy;
    vcy = prev(lower_bound(all(frds[y]),mp(v+1,vector<int>{})))->sc;
    // cout << " y " << prev(lower_bound(all(frds[y]),mp(v+1,vector<int>{})))->fr << endl;

    if(vcx.size() == 0) return 1000000000;
    if(vcy.size() == 0) return 1000000000;

    int i = 0;
    int j = 0;
    int ans = inf1;
    while(i != vcx.size() && j != vcy.size()) {
        ans = min(ans, abs(a[vcx[i]]-a[vcy[j]]));
        if(a[vcx[i]] < a[vcy[j]]) {
            //increase i
            i++;
        }
        else {
            j++;
        }
    }

    return ans;
}

Compilation message (stderr)

potion.cpp: In function 'int question(int, int, int)':
potion.cpp:89:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   89 |     while(i != vcx.size() && j != vcy.size()) {
      |           ~~^~~~~~~~~~~~~
potion.cpp:89:32: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   89 |     while(i != vcx.size() && j != vcy.size()) {
      |                              ~~^~~~~~~~~~~~~

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