Submission #1255583

#TimeUsernameProblemLanguageResultExecution timeMemory
1255583Zbyszek99Trains (BOI24_trains)C++20
16 / 100
168 ms5588 KiB
#include <bits/stdc++.h> #include <ext/pb_ds/assoc_container.hpp> #include <ext/pb_ds/tree_policy.hpp> #define ll long long #define ld long double #define ull unsigned long long #define ff first #define ss second #define pii pair<int,int> #define pll pair<long long, long long> #define vi vector<int> #define vl vector<long long> #define pb push_back #define rep(i, b) for(int i = 0; i < (b); ++i) #define rep2(i,a,b) for(int i = a; i <= (b); ++i) #define rep3(i,a,b,c) for(int i = a; i <= (b); i+=c) #define count_bits(x) __builtin_popcountll((x)) #define all(x) (x).begin(),(x).end() #define siz(x) (int)(x).size() #define forall(it,x) for(auto& it:(x)) using namespace __gnu_pbds; using namespace std; typedef tree<int, null_type, less<int>, rb_tree_tag,tree_order_statistics_node_update> ordered_set; //mt19937 mt;void random_start(){mt.seed(chrono::time_point_cast<chrono::milliseconds>(chrono::high_resolution_clock::now()).time_since_epoch().count());} //ll los(ll a, ll b) {return a + (mt() % (b-a+1));} const int INF = 1e9+50; const ll INF_L = 1e18+40; const ll MOD = 1e9+7; const int sqr = 400; ll dp[100001]; int D[100001]; int X[100001]; ll dp_mod[sqr+1][sqr+1]; vi del[100001]; int main() { ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0); //random_start(); int n; cin >> n; rep2(i,1,n) cin >> D[i] >> X[i]; dp[1] = 1; ll ans = 0; rep2(i,1,n) { forall(it,del[i]) { dp_mod[D[it]][it%D[it]] = (dp_mod[D[it]][it%D[it]]-dp[it]+MOD)%MOD; } rep2(j,1,sqr) { dp[i] = (dp[i]+dp_mod[j][i%j])%MOD; } ans += dp[i]; ans %= MOD; if(D[i] == 0) continue; if(D[i] > sqr) { rep2(j,1,X[i]) { int poz = i+D[i]*j; if(poz > n) break; dp[poz] = (dp[poz]+dp[i])%MOD; } } else { dp_mod[D[i]][i%D[i]] = (dp_mod[D[i]][i%D[i]]+dp[i])%MOD; int poz = i+D[i]*(X[i]+1); if(poz <= n) del[poz].pb(i); } } cout << ans << "\n"; }
#Verdict Execution timeMemoryGrader output
Fetching results...
#Verdict Execution timeMemoryGrader output
Fetching results...
#Verdict Execution timeMemoryGrader output
Fetching results...
#Verdict Execution timeMemoryGrader output
Fetching results...
#Verdict Execution timeMemoryGrader output
Fetching results...