Submission #1120119

#	Time	Username	Problem	Language	Result	Execution time	Memory
1120119		vjudge1	Foehn Phenomena (JOI17_foehn_phenomena)	C++17	100 / 100	125 ms	14864 KiB

foehn_phenomena

#include <bits/stdc++.h>
#define F first
#define S second
#define LL long long
 
#define rep(i, x) for(auto &i : (x))
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
 
#define left(x) ((x)<<1)
#define right(x) ((x)>>1)
#define LSOne(x) (x & -(x))
 
using namespace std;
using T = pair<pair<int, int>, int>;
 
const int SZ = 2e5 + 1;
const LL MOD = 1e9 + 7; 
const LL INF = 1e18 + 1;
 
LL bp (LL b, LL e, LL m = MOD) {
 if ( e == 0 ) return 1;
 LL T = bp(b, e / 2);
 T *= T; T %= m;
 if ( e & 1 ) T *= b;
 return T %= m;
}
 
LL nv_i (LL a) { return bp(a, MOD - 2); };
LL gcd (LL a, LL b) { return (b == 0 ? a : gcd(b, a % b)); }
LL lcm(LL a, LL b) { return (a * (b / gcd(a, b))); }
LL ceil (LL a, LL b) { return ((a + b - 1) / b); }
 
struct FTree {
  int n;
  vector<LL> FT;

  FTree(int _n) {
    n = _n;
    FT.resize(n + 1);
  }

  void update(int pos, LL val) {
    for(; pos <= n; pos += LSOne(pos)) {
      FT[pos] += val;
    }
  }

  void update(int L, int R, LL val) {
    update(L, val);
    update(R + 1, -val);
  }

  LL query(int pos) {
    LL sum = 0;
    for(; pos > 0; pos -= LSOne(pos)) {
      sum += FT[pos];
    }
    return sum;
  }

  LL query(int L, int R) {
    return query(R) - query(L - 1);
  }
};

void solve() {
  int n, q, s, t;
  cin >> n >> q >> s >> t;

  vector<LL> DIF(n + 1), V(n + 1);
  vector<bool> VB(n + 1);

  for(int i = 0; i <= n; i ++) cin >> V[i];

  FTree FTree_0(n); 

  LL cnt_0 = 0, cnt_1 = 0;
  
  for(int i = 1; i <= n; i ++) {
    DIF[i] = V[i] - V[i - 1];
    VB[i] = DIF[i] > 0;

    if(VB[i])
      cnt_1 += DIF[i];
    else
      cnt_0 += abs(DIF[i]);
  }

  for(int i = 0; i < q; i ++) {
    int L, R;
    LL val;
    cin >> L >> R >> val;

    FTree_0.update(L, R, val);

    LL i_0 = V[L] + FTree_0.query(L), i_1 = V[L - 1] + FTree_0.query(L - 1);

    if(VB[L])
      cnt_1 -= DIF[L];
    else
      cnt_0 -= abs(DIF[L]);

    DIF[L] = i_0 - i_1;
    VB[L] = DIF[L] > 0;

    if(VB[L])
      cnt_1 += DIF[L];
    else
      cnt_0 += abs(DIF[L]);
 
    if(R < n) {
      i_0 = V[R + 1] + FTree_0.query(R + 1), i_1 = V[R] + FTree_0.query(R);

      if(VB[R + 1])
        cnt_1 -= DIF[R + 1];
      else
        cnt_0 -= abs(DIF[R + 1]);

      DIF[R + 1] = i_0 - i_1;
      VB[R + 1] = DIF[R + 1] > 0;

      if(VB[R + 1])
        cnt_1 += DIF[R + 1];
      else
        cnt_0 += abs(DIF[R + 1]);
    }

    cout << (cnt_1 * s - cnt_0 * t) * -1 << "\n";
//    cout << cnt_0 * s + cnt_1 * t << "\n";
  }
} 
signed main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0), cout.tie(0);
 
  solve();
  return 0;
}

• Subtask 1: 30 / 30
• Subtask 2: 10 / 10
• Subtask 3: 60 / 60