Submission #70849

#	Time	Username	Problem	Language	Result	Execution time	Memory
70849		someone_aa	Art Exhibition (JOI18_art)	C++17	50 / 100	1071 ms	49612 KiB

art

#include <bits/stdc++.h>
#define ll long long
#define pb push_back
#define mp make_pair
using namespace std;
const int maxn = 500100;
map<ll, ll> sum;
vector<pair<ll, ll> > values;
vector<ll> pref;
ll n, x, y;

ll get_val(int l, int r) {
    ll sum =1LL* pref[r] - pref[l-1];
    ll diff = values[r].first - values[l].first;
    return sum - diff;
}

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cin>>n;
    for(int i=0;i<n;i++) {
        cin>>x>>y;
        sum[x] += y;
    }

    values.pb(mp(0LL,0LL));
    pref.pb(0LL);
    for(auto i:sum) {
        values.pb(mp(i.first, i.second));
        pref.pb(pref.back() + i.second);
    }

    ll l = 1LL;
    ll result = get_val(1,1);
    ll max_pref = values[1].first;
    for(ll i=2;i<values.size();i++) {
        max_pref = max(max_pref, values[i].first - pref[i-1]);
        ll curr_val = pref[i] - values[i].first + max_pref;
        result = max(result, curr_val);
    }
    cout<<result;

    return 0;
}

Compilation message (stderr)

art.cpp: In function 'int main()':
art.cpp:37:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(ll i=2;i<values.size();i++) {
                ~^~~~~~~~~~~~~~
art.cpp:34:8: warning: unused variable 'l' [-Wunused-variable]
     ll l = 1LL;
        ^

• Subtask 1: 10 / 10
• Subtask 2: 20 / 20
• Subtask 3: 20 / 20
• Subtask 4: 0 / 50