#include <bits/stdc++.h> using namespace std; #ifdef LOCAL #include "debug.h" #else #define debug(...) #endif // LOCAL #define ll long long #define F first #define S second #define pb push_back #define pii pair<int, int> #define sz(x) (int)(x).size() #define all(x) (x).begin(), (x).end() const int N = 2e5 + 5; const int mod = 1e9 + 7; const ll inf = 1e18; int n, d, q; int c[N]; int a[N]; ll suf[N], p[N]; int lef[N][20]; ll val[N][20]; ll rmq[N][20]; ll get_min(int l, int r) { int lg = 31 - __builtin_clz(r - l + 1); return min(rmq[l][lg], rmq[r - (1 << lg) + 1][lg]); } ll get(int l, int r) { if (l > r) return 0; if (get_min(l, r) < - suf[r + 1] * d) return inf; return (p[r] - p[l - 1]) - suf[r + 1] * (r - l + 1); } void solve() { cin >> n >> d; for (int i = 1; i <= n; i++) { cin >> c[i]; } for (int i = 2; i <= n; i++) { if (c[i - 1] > c[i]) a[i] = (c[i - 1] - c[i] + d - 1) / d; else a[i] = - (c[i] - c[i - 1]) / d; } for (int i = n; i >= 1; i--) { suf[i] = suf[i + 1] + a[i]; } for (int i = 1; i <= n; i++) { p[i] = p[i - 1] + suf[i]; } vector<int> vec; vec.pb(1); for (int i = 1; i <= n; i++) { while(!vec.empty() && suf[vec.back()] > suf[i + 1]) vec.pop_back(); if (!vec.empty()) lef[i][0] = vec.back() - 1; vec.pb(i + 1); } for (int i = 1; i <= n; i++) rmq[i][0] = - suf[i] * d + c[i - 1]; for (int i = 1; i < 20; i++) { for (int j = 1; j <= n - (1 << i) + 1; j++) { rmq[j][i] = min(rmq[j][i - 1], rmq[j + (1 << (i - 1))][i - 1]); } } for (int i = 1; i <= n; i++) { val[i][0] = get(lef[i][0] + 2, i); } for (int i = 1; i < 20; i++) { for (int j = 1; j <= n; j++) { lef[j][i] = lef[lef[j][i - 1]][i - 1]; val[j][i] = val[j][i - 1] + val[lef[j][i - 1]][i - 1]; if (val[j][i] > inf) val[j][i] = inf; } } cin >> q; while(q--) { int l, r; cin >> l >> r; int cur = r; ll res = 0; for (int i = 19; i >= 0; i--) { if (lef[cur][i] + 1 >= l) { res += val[cur][i]; if (res > inf) res = inf; cur = lef[cur][i]; } } res += get(l + 1, cur); if (res > inf) res = inf; if (res >= inf) cout << -1; else cout << res; cout << '\n'; } } signed main() { ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0); #define task "template" if (fopen(task".inp", "r")) { freopen(task".inp", "r", stdin); freopen(task".out", "w", stdout); } int T = 1; // cin >> T; while (T--) { solve(); } }

Main.cpp: In function 'int main()':
Main.cpp:105:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  105 |         freopen(task".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:106:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  106 |         freopen(task".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~