Submission #1111758

#TimeUsernameProblemLanguageResultExecution timeMemory
1111758zxciganFish 3 (JOI24_fish3)C++17
16 / 100
71 ms9288 KiB
#include <bits/stdc++.h> using namespace std; mt19937_64 rng(time(0)); using ll = long long; #define int long long const int N = 2e5 + 1; void solve() { int n, d; cin >> n >> d; vector<int> c(n + 1), pref (n + 1); for (int i = 1; i <= n; ++i) { cin >> c[i]; pref[i] = pref[i - 1] + c[i]; } int q; cin >> q; if (n <= (int)3e3 && q <= (int)3e3) { while (q--) { int l, r; cin >> l >> r; vector<int> a = c; int res = 0; bool bad = 0; for (int i = r - 1; i >= l; --i) { if (a[i] > a[i + 1]) { int p = (a[i] - a[i + 1] + d - 1) / d; res += p; a[i] -= p * d; } if (a[i] < 0) { bad = 1; break; } } cout << (!bad ? res : -1) << '\n'; } return; } vector<int> mxl (n + 1); for (int i = 1; i <= n; ++i) { if (c[i]) mxl[i] = mxl[i - 1] + 1; } while (q--) { int l, r; cin >> l >> r; int ans = 0, wr = r; r -= mxl[r]; if (r >= l) ans = pref[r] - pref[l - 1]; if (ans) { if (d > 1) { cout << "-1\n"; continue; } } cout << ans << '\n'; } } int32_t main() { ios_base::sync_with_stdio(false); cin.tie(nullptr); #ifdef LOCAL freopen("input.txt", "r", stdin); freopen("output.txt", "w", stdout); #endif // LOCAL int T = 1; while (T--) solve(); return 0; }

Compilation message (stderr)

Main.cpp: In function 'void solve()':
Main.cpp:47:22: warning: unused variable 'wr' [-Wunused-variable]
   47 |         int ans = 0, wr = r;
      |                      ^~
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