Submission #636624

#TimeUsernameProblemLanguageResultExecution timeMemory
636624stoyan_malininPeru (RMI20_peru)C++14
0 / 100
0 ms340 KiB
#include "peru.h" #ifdef _LOCAL_ #include "grader.cpp" #endif // _LOCAL_ #include <cassert> #include <vector> #include <deque> #include <set> using namespace std; int rmq(int l, int r, const int *a) { int maxVal = a[l]; for(int i = l+1;i<=r;i++) maxVal = max(maxVal, a[i]); return maxVal; } int convertToAns(const vector<long long> &dp) { long long p23 = 1, ans = 0; const long long mod = 1e9 + 7; for(int i = dp.size()-1;i>=0;i--) { ans = (ans + (dp[i]%mod)*p23)%mod; p23 = (p23*23)%mod; } return ans; } int solve(int n, int k, int* a) { vector <long long> dp(n); dp[0] = a[0]; deque <int> dq = {0}; deque <pair <long long, int>> values; long long prefMaxVal = a[0]; for(int i = 1;i<n;i++) { dp[i] = 1e18; prefMaxVal = max(prefMaxVal, (long long)a[i]); if(i<k) dp[i] = min(dp[i], prefMaxVal); while(dq.empty()==false && i-dq.front()>=k) { int j = dq.front(); dq.pop_front(); if(dq.empty()==false) { if(values.empty()==false && values.front()==make_pair(dp[j]+a[dq.front()], j)) values.pop_front(); } } while(dq.empty()==false && a[dq.back()]<=a[i]) { if(dq.size()>=2) { if(values.empty()==false && values.back()==make_pair(dp[*prev(prev(dq.end()))] + a[dq.back()], *prev(prev(dq.end())))) values.pop_back(); } dq.pop_back(); } if(dq.empty()==false) { while(values.empty()==false && values.back().first>=dp[dq.back()]+a[i]) values.pop_back(); values.emplace_back(dp[dq.back()]+a[i], dq.back()); } dq.push_back(i); int last = max(i-k, 0); if(dq.front()>last) dp[i] = min(dp[i], dp[last] + a[dq.front()]); if(values.empty()==false) dp[i] = min(dp[i], values.front().first); assert(values.size()<=dq.size()-1); /* cout << "dq: ";for(int x: dq) cout << x << " "; cout << '\n'; cout << "values: ";for(auto item: values) cout << "(" << item.first << ", " << item.second << ") "; cout << '\n'; cout << "dp[" << i << "] = " << dp[i] << '\n'; */ } return convertToAns(dp); }
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