Educational Codeforces Round 100 (Rated for Div. 2) B. Find The Array
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| #include <bits/stdc++.h>
#pragma optimization_level 3 #pragma GCC optimize("Ofast,no-stack-protector,unroll-loops,fast-math,O3") #pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx") #pragma GCC optimize("Ofast") #pragma GCC target("avx,avx2,fma") #pragma GCC optimization ("unroll-loops")
struct PairHash {inline std::size_t operator()(const std::pair<int,int> & v) const {return v.first*31+v.second;}};
#define MAX_N 202020 #define INF 987654321 #define EPS 1e-9 #define ll long long #define pll pair<ll, ll> #define vpll vector<pll> #define vall3 vector<array<ll,3>> #define all3 array<ll,3> #define all5 array<ll,5> #define vall5 vector<all5> #define vll vector<ll> #define vi vector<int> #define vs vector<string> #define usll unordered_set<ll> #define uspll unordered_set<pll, PairHash> #define umll unordered_map<ll,ll> #define vvs vector<vs> #define vvll vector<vll> #define all(a) begin(a), end(a) #define rall(a) rbegin(a), rend(a)
using namespace std; vll solve(vll& A) { ll n = A.size(), sum = 0, even = 0, odd = 0; for(ll i = 0; i < n; i++) { sum += A[i]; if(i & 1) odd += A[i] - 1; else even += A[i] - 1; } if(odd * 2 <= sum) { for(ll i = 0; i < n; i++) if(i & 1) A[i] = 1; } else { for(ll i = 0; i < n; i++) if(!(i & 1)) A[i] = 1; } return A; }
int main() { ios_base::sync_with_stdio(0); cin.tie(0); ll tc = 1; cin>>tc; for(ll i = 1; i <= tc; i++) { ll n; cin>>n; vll A(n); for(ll j = 0; j < n; j++) cin>>A[j]; vll res = solve(A); for(auto& r : res) cout<<r<<' ';cout<<endl; } return 0; }
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