Submission #292432

#	Time	Username	Problem	Language	Result	Execution time	Memory
292432		zoooma13	Meetings (IOI18_meetings)	C++14	19 / 100	745 ms	2176 KiB

meetings

#include <bits/stdc++.h>
#include "meetings.h"
using namespace std;

vector<long long> minimum_costs(vector<int> H, vector<int> L, vector<int> R){
    assert(H.size() <= 5000);
    vector <long long> dpL(H.size()) ,dpR(H.size()) ,ans(L.size() ,LLONG_MAX);
    for(int q = 0; q < L.size(); q++){
        int l = L[q] ,r = R[q];

        long long cur = 0;
        vector <int> mq{l-1};
        for(int i=l; i<=r; i++){
            while(mq.size()>1 && H[mq.back()] <= H[i]){
                cur -= 1LL*(mq.back()-mq[(int)mq.size()-2])*H[mq.back()];
                mq.pop_back();
            }
            cur += 1LL*(i-mq.back())*H[i];
            mq.push_back(i);
            dpL[i] = cur;
        }
        mq = {r+1} ,cur = 0;
        for(int i=r; i>=l; i--){
            while(mq.size()>1 && H[mq.back()] <= H[i]){
                cur -= 1LL*(mq[(int)mq.size()-2]-mq.back())*H[mq.back()];
                mq.pop_back();
            }
            cur += 1LL*(mq.back()-i)*H[i];
            mq.push_back(i);
            dpR[i] = cur;
        }

        for(int i=l; i<=r; i++)
            ans[q] = min(ans[q] ,dpL[i]+dpR[i]-H[i]);
    }
    return ans;
}

Compilation message (stderr)

meetings.cpp: In function 'std::vector<long long int> minimum_costs(std::vector<int>, std::vector<int>, std::vector<int>)':
meetings.cpp:8:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    8 |     for(int q = 0; q < L.size(); q++){
      |                    ~~^~~~~~~~~~

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