Submission #1119415

#	Time	Username	Problem	Language	Result	Execution time	Memory
1119415		vjudge1	Foehn Phenomena (JOI17_foehn_phenomena)	C++17	0 / 100	47 ms	26704 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;
    }
  }

  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;
  LL s, t;
  cin >> n >> q >> s >> t;

  vector<LL> V(4*n + 2), DIF(4*n + 2);

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

  FTree FTree_0(4*n + 2), FTree_1(4*n + 2);

  for(int i = 0; i < n - 1; i ++) {
    LL dif = V[i] - V[i + 1];
    if(dif <= 0)
      FTree_0.update(i + 1, dif);
    else
      FTree_1.update(i + 1, dif);
  }
  return;
  for(int i = 0; i < q; i ++) {
    int L, R;
    LL val;
    cin >> L >> R >> val;

    if(L == R) {
      V[L] += val;
    }
    else {
      V[L] += val;
      V[R] += val;
    }
    
    LL dif_L = V[L - 1] - V[L], dif_R = V[R] - V[R + 1];
    
    LL sum_0_L = FTree_0.query(L, L);
    LL sum_0_R = FTree_0.query(R + 1, R + 1);

    LL sum_1_L = FTree_1.query(L, L);
    LL sum_1_R = FTree_1.query(R + 1, R + 1);
    
    
    if(dif_L <= 0) {
      FTree_1.update(L, -sum_1_L);
      FTree_0.update(L, -sum_0_L); 
      FTree_0.update(L, dif_L);
    }
    else {
      FTree_0.update(L, -sum_0_L); 
      FTree_1.update(L, -sum_1_L);
      FTree_1.update(L, dif_L);
    }
    if(dif_R <= 0) {
      FTree_1.update(R + 1, -sum_1_R);
      FTree_0.update(R + 1, -sum_0_R);
      FTree_0.update(R + 1, dif_R);
    }
    else {
      FTree_0.update(R + 1, -sum_0_R);
      FTree_1.update(R + 1, -sum_1_R);
      FTree_1.update(R + 1, dif_R);
    }
    
    cout << FTree_0.query(n - 1) * s + FTree_1.query(n - 1) * t << "\n";
  }

} 
signed main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0), cout.tie(0);
 
  solve();
  return 0;
}

• Subtask 1: 0 / 30
• Subtask 2: 0 / 10
• Subtask 3: 0 / 60