제출 #302235

#제출 시각아이디문제언어결과실행 시간메모리
302235square1001말 (IOI15_horses)C++14
34 / 100
1582 ms33912 KiB
#include "horses.h" #include <set> #include <vector> #include <iostream> #include <algorithm> using namespace std; const int mod = 1000000007; int N; set<int> s; vector<int> X, Y; int solve() { long long mult = 1; set<int>::iterator it = s.end(); vector<int> st = { N }; while(it != s.begin()) { --it; mult *= X[*it]; st.push_back(*it); if(mult > 1000000000) break; } if(mult <= 1000000000 && st.back() != 0) { st.push_back(0); } reverse(st.begin(), st.end()); int ini = st[0]; int coeff = 1; for(int i = 0; i <= ini; ++i) { coeff = int(1LL * coeff * X[i] % mod); } long long ans = 0; mult = 1; for(int i = 0; i < int(st.size()) - 1; ++i) { int mx = 0; for(int j = st[i]; j < st[i + 1]; ++j) { mx = max(mx, Y[j]); } ans = max(ans, mult * mx); if(i != int(st.size()) - 2) { mult *= X[st[i + 1]]; } } ans = (ans % mod) * coeff % mod; return int(ans); } int init(int N_, int X_[], int Y_[]) { N = N_; X = vector<int>(X_, X_ + N); Y = vector<int>(Y_, Y_ + N); for(int i = 0; i < N; ++i) { if(X[i] >= 2) { s.insert(i); } } return solve(); } int updateX(int pos, int val) { if(X[pos] == 1 && val >= 2) { s.insert(pos); } if(X[pos] >= 2 && val == 1) { s.erase(pos); } X[pos] = val; return solve(); } int updateY(int pos, int val) { Y[pos] = val; return solve(); }
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