Submission #760009

#	Time	Username	Problem	Language	Result	Execution time	Memory
760009		dxz05	Liteh and Newfiteh (INOI20_litehfiteh)	C++17	0 / 100	1 ms	340 KiB

Main

//#pragma GCC optimize("Ofast,O3,unroll-loops")
//#pragma GCC target("avx2")

#include <bits/stdc++.h>

using namespace std;

#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define bpc(x) __builtin_popcount(x)
#define bpcll(x) __builtin_popcountll(x)
#define MP make_pair
//#define endl '\n'

mt19937 rng(chrono::high_resolution_clock::now().time_since_epoch().count());

typedef long long ll;
const int MOD = 1e9 + 7;
const int N = 1e6 + 3e2;

int a[N];

void solve(){
    int n;
    cin >> n;

    set<int> zeros;
    for (int i = 1; i <= n; i++){
        cin >> a[i];
        if (a[i] == 0) zeros.insert(i);
    }

    vector<pair<int, int>> segments;

    int k = 10;
    while (k--){
        if (zeros.size() == n) break;

        int l = 1, r = 1 << k;
        while (r <= n){
            auto it = zeros.lower_bound(l);
            bool ok = (it == zeros.end() || *it > r);

            for (auto [sl, sr] : segments){
                if (max(l, sl) > min(r, sr)) continue;
                if (abs(l - sl) % min(r - l + 1, sr - sl + 1) != 0) ok = false;
            }

            if (ok){
                segments.emplace_back(l, r);
                for (int i = l; i <= r; i++){
                    a[i]--;
                    if (a[i] == 0) zeros.insert(i);
                }
            }

            ++l, ++r;
        }
    }

    if (zeros.size() == n){
        cout << segments.size() << endl;
    } else {
        cout << -1 << endl;
    }

}

int main(){
    clock_t startTime = clock();
    ios_base::sync_with_stdio(false);

#ifdef LOCAL
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
#endif

    int test_cases = 1;
//    cin >> test_cases;

    for (int test = 1; test <= test_cases; test++){
        // cout << (solve() ? "YES" : "NO") << endl;
        solve();
    }

#ifdef LOCAL
    cerr << "Time: " << int((double) (clock() - startTime) / CLOCKS_PER_SEC * 1000) << " ms" << endl;
#endif

    return 0;
}

Compilation message (stderr)

Main.cpp: In function 'void solve()':
Main.cpp:37:26: warning: comparison of integer expressions of different signedness: 'std::set<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   37 |         if (zeros.size() == n) break;
      |             ~~~~~~~~~~~~~^~~~
Main.cpp:61:22: warning: comparison of integer expressions of different signedness: 'std::set<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   61 |     if (zeros.size() == n){
      |         ~~~~~~~~~~~~~^~~~
Main.cpp: In function 'int main()':
Main.cpp:70:13: warning: unused variable 'startTime' [-Wunused-variable]
   70 |     clock_t startTime = clock();
      |             ^~~~~~~~~

• Subtask 1: 0 / 30
• Subtask 2: 0 / 70