Submission #1054828

#	Time	Username	Problem	Language	Result	Execution time	Memory
1054828		Ahmed57	Meetings (IOI18_meetings)	C++17	0 / 100	5567 ms	14676 KiB

meetings

#include "bits/stdc++.h"

using namespace std;
#define int long long
int arr[100001];
pair<int,int> seg[400001];
int n ,q;
void build(int p,int l,int r){
    if(l==r){
        seg[p] = {arr[l],l};
        return ;
    }
    int md = (l+r)/2;
    build(p*2,l,md);
    build(p*2+1,md+1,r);
    seg[p] = max(seg[p*2],seg[p*2+1]);
}
pair<int,int> query(int p,int l,int r,int lq,int rq){
    if(l>=lq&&r<=rq)return seg[p];
    if(r<lq||l>rq)return {0,0};
    int md = (l+r)/2;
    return max(query(p*2,l,md,lq,rq),query(p*2+1,md+1,r,lq,rq));
}
map<pair<int,int>,int> dp; 
vector<int> val[21];
int solve(int l,int r){
    if(l>r)return 0;
    if(dp.find(make_pair(l,r))!=dp.end())return dp[{l,r}];
    int ind = query(1,0,n-1,l,r).second;
    int it = lower_bound(val[arr[ind]].begin(),val[arr[ind]].end(),l)-val[arr[ind]].begin();
    int it2 = it;
    while(it2<val[arr[ind]].size()&&val[arr[ind]][it2]<=r)it2++;
    it2--;
    int ma = 1e18;
    {//l
        ma = min(ma,solve(l,val[arr[ind]][it]-1)+((r-l+1)-(val[arr[ind]][it]-l))*arr[ind]);
    }
    {//r
        ma = min(ma,solve(val[arr[ind]][it2]+1,r)+((r-l+1)-(r-val[arr[ind]][it2]))*arr[ind]);
    }
    for(int i = it;i<it2;i++){
        ma = min(ma,solve(val[arr[ind]][i]+1,val[arr[ind]][i+1]-1)+((r-l+1)-(val[arr[ind]][i+1]-val[arr[ind]][i]-1))*arr[ind]);
    }
    return dp[{l,r}] = ma;
}
vector<long long> minimum_costs(vector<int32_t> H, vector<int32_t> L, vector<int32_t> R){
    n = H.size();
    q = L.size();

    for(int i = 0;i<n;i++){
        arr[i] = H[i];
        val[arr[i]].push_back(i);
    }
    build(1,0,n-1);
    vector<long long> an;
    for(int i = 0;i<q;i++){
        an.push_back(solve(L[i],R[i]));
    }
    return an;
}

Compilation message (stderr)

meetings.cpp: In function 'long long int solve(long long int, long long int)':
meetings.cpp:32:14: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   32 |     while(it2<val[arr[ind]].size()&&val[arr[ind]][it2]<=r)it2++;
      |           ~~~^~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 4
• Subtask 2: 0 / 15
• Subtask 3: 0 / 17
• Subtask 4: 0 / 24
• Subtask 5: 0 / 40