제출 #978291

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
978291		mannshah1211	Fish 3 (JOI24_fish3)	C++17	0 / 100	2098 ms	7936 KiB

Main

/**
 *  author: hashman
 *  created:
**/

#include <bits/stdc++.h>

using namespace std;

string to_string(string s) {
  return '"' + s + '"';
}

string to_string(const char* s) {
  return to_string((string) s);
}

string to_string(bool b) {
  return (b ? "true" : "false");
}

template <typename A, typename B>
string to_string(pair<A, B> p) {
  return "(" + to_string(p.first) + ", " + to_string(p.second) + ")";
}

template <typename A>
string to_string(A v) {
  bool first = true;
  string res = "{";
  for (const auto &x : v) {
    if (!first) {
      res += ", ";
    }
    first = false;
    res += to_string(x);
  }
  res += "}";
  return res;
}

void debug_out() {
  cerr << endl;
}

template <typename Head, typename... Tail>
void debug_out(Head H, Tail... T) {
  cerr << " " << to_string(H);
  debug_out(T...);
}

#define debug(...) cerr << "[" << #__VA_ARGS__ << "]:", debug_out(__VA_ARGS__)

using Int = long long;

int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  int n;
  cin >> n;
  Int d;
  cin >> d;
  vector<Int> c(n);
  for (int i = 0; i < n; i++) {
    cin >> c[i];
  }
  int q;
  cin >> q;
  for (int i = 0; i < q; i++) {
    int l, r;
    cin >> l >> r;
    --l; --r;
    Int term = 0, ans = 0;
    bool ok = true;
    for (int j = l; j <= r; j++) {
      if (term > c[j]) {
        ok = false;
      } else {
        Int cur = c[j] - term;
        Int k = cur / d;
        ans += k;
        term = c[j] - k * d;
      }
    }
    if (!ok) {
      cout << -1 << '\n';
    } else {
      cout << ans << '\n';
    }
  }
}

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