이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
#include <bits/stdc++.h>
#define int long long
using namespace std;
const int MOD = 1e9 + 7;
struct Ville {
int raison, nbStops;
};
vector<vector<vector<int>>> cumulatifs;
signed main() {
ios_base::sync_with_stdio(false);
cin.tie(NULL); cout.tie(NULL);
for(int raison = 0;raison <= 100;raison++) {
cumulatifs.push_back(vector<vector<int>>(
raison, {0}
));
}
int nbVilles;
cin >> nbVilles;
vector<Ville> villes(nbVilles);
for(Ville& ville : villes) {
cin >> ville.raison >> ville.nbStops;
}
reverse(villes.begin(), villes.end());
vector<int> reponses;
for(int iVille = 0;iVille < nbVilles;iVille++) {
int nbChemins = 1;
Ville& v = villes[iVille];
if(v.raison > 100) {
for(int stop = 1;stop <= v.nbStops;stop++) {
int pos = iVille - stop * v.raison;
if(pos < 0) break;
nbChemins += reponses[pos];
}
} else if(v.raison != 0) {
int nbIn = min(v.nbStops, iVille / v.raison);
if(nbIn > 0) {
vector<int>& cumul = cumulatifs[v.raison][iVille % v.raison];
nbChemins += cumul.back()
- cumul[(int)cumul.size() - nbIn - 1];
}
}
nbChemins %= MOD;
nbChemins += MOD;
nbChemins %= MOD;
reponses.push_back(nbChemins);
for(int raison = 1;raison <= 100;raison++) {
cumulatifs[raison][iVille % raison].push_back(
cumulatifs[raison][iVille % raison].back()
+ nbChemins
);
}
}
cout << reponses.back() << endl;
return 0;
}
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