Submission #950321

#	Time	Username	Problem	Language	Result	Execution time	Memory
950321		berr	Fibonacci representations (CEOI18_fib)	C++17	15 / 100	4019 ms	4024 KiB

fib

#include <bits/stdc++.h>
using namespace std;
#define int long long
const int mod =1e9+7;

int mul(int x, int y){
    return (x*y)%mod;
}

int sum(int x, int y){
    return (x+y) % mod;
}
int poww(int x, int y){
    if(y==0) return 1;

    int tmp =poww(x, y/2);
    tmp=mul(tmp, tmp);

    if(y%2) return mul(tmp, x);
    return tmp;
}

signed main(){
    ios_base::sync_with_stdio(false);
    cin.tie(0);



    int n; cin >> n;
    vector<int> a(n);
    int cnt=1;
    for(auto &i: a) cin >> i;
    set<int> st;

    for(int i=0; i<n; i++){
        int ans=1;
        st.insert(a[i]);
        vector<array<int, 2>> dp(st.size());

        dp[0]={1, (*st.begin()-1)/2};
        if(*st.begin()<2){
            dp[0][1]=0;
        }
        int cnt=1;
        int last=*st.begin();
        for(auto h: st){
            if(h==*st.begin()) continue;

            dp[cnt][0]=sum(dp[cnt-1][0], dp[cnt-1][1]);
            dp[cnt][1]=sum(mul(dp[cnt-1][0], (h-last-1)/2), mul(dp[cnt-1][1], (h-last)/2));
            cnt++; last=h;
        }

        cout<<sum(dp[i][0], dp[i][1])<<"\n";
    }


}   

Compilation message (stderr)

fib.cpp: In function 'int main()':
fib.cpp:37:13: warning: unused variable 'ans' [-Wunused-variable]
   37 |         int ans=1;
      |             ^~~
fib.cpp:32:9: warning: unused variable 'cnt' [-Wunused-variable]
   32 |     int cnt=1;
      |         ^~~

• Subtask 1: 0 / 5
• Subtask 2: 0 / 20
• Subtask 3: 15 / 15
• Subtask 4: 0 / 10
• Subtask 5: 0 / 15
• Subtask 6: 0 / 35