This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
#define int long long
using namespace std;
const int MAX = 1e5+1;
int nbAHauteur[MAX];
int nbPeutSurHauteur[MAX];
signed main(void)
{
ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
int nbPoteaux;
cin >> nbPoteaux;
int nbRestants(0);
for (int iPoteau = 0; iPoteau < nbPoteaux; ++iPoteau)
{
int hauteur, aMettre;
cin >> hauteur >> aMettre;
nbAHauteur[hauteur]++;
nbRestants += aMettre;
nbPeutSurHauteur[hauteur] += aMettre;
}
int sol(0);
int nbPoteauxDispo = 0;
int nbDrapeauxDispo = 0;
for (int iHauteur(MAX-1); iHauteur; --iHauteur)
{
nbPoteauxDispo += nbAHauteur[iHauteur];
nbDrapeauxDispo += nbPeutSurHauteur[iHauteur];
int moy = (nbRestants + iHauteur - 1) / iHauteur;
int placeEtage = min({moy, nbPoteauxDispo, nbDrapeauxDispo});
nbDrapeauxDispo -= placeEtage;
nbRestants -= placeEtage;
sol += placeEtage * (placeEtage - 1) / 2;
}
cout << sol << endl;
}
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