# | Time | Username | Problem | Language | Result | Execution time | Memory |
---|---|---|---|---|---|---|---|
133872 | sebinkim | Fibonacci representations (CEOI18_fib) | C++14 | 4019 ms | 1728 KiB |
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>
using namespace std;
typedef long long ll;
typedef pair <ll, ll> pll;
const ll mod = 1e9 + 7;
set <pll> S;
ll n;
void erase(set <pll>::iterator it) { S.erase(it); }
void insert(pll p) { S.insert(p); }
void insert(ll t, ll x)
{
auto it = S.lower_bound(pll(x, 1e9));
if(it == S.begin() || prev(it) -> second < x){
pll p(x - 1, x + 1);
if(it != S.begin() && prev(it) -> second + 1 == x){
p.first = prev(it) -> first; erase(prev(it));
}
it = S.lower_bound(pll(x, 1e9));
if(it != S.end() && x + 1 == it -> first){
p.second = it -> second; erase(it);
}
insert(p);
}
else{
it = prev(it);
if(it -> second - x & 1){
pll p(it -> first, x - 1);
ll x1 = it -> first - 1, x2 = it -> second;
erase(it); insert(t, x2);
if(p.first < p.second) insert(p);
if(x1 > 0) insert(t, x1);
}
else{
pll p(it -> first, it -> second == x? x - 2: x);
x = it -> second + 1;
erase(it); insert(t, x);
if(p.first < p.second) insert(p);
}
}
}
int main()
{
ll i, x;
ll d0, d1, lt, _d0, _d1, d, l;
scanf("%lld", &n);
for(i=0; i<n; i++){
scanf("%lld", &x);
insert(i, x);
d0 = 0; d1 = 1; lt = 0;
for(pll t: S){
d = t.first + 1 - lt; l = (t.second - t.first) / 2;
_d0 = ((d / 2) * d0 + (d - 1) / 2 * d1) % mod;
_d1 = (d0 + d1 + _d0 * (l - 1)) % mod;
d0 = _d0; d1 = _d1; lt = t.second - 1;
}
printf("%lld\n", (d0 + d1) % mod);
}
return 0;
}
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