Submission #197023

#	Time	Username	Problem	Language	Result	Execution time	Memory
197023		quocnguyen1012	Foehn Phenomena (JOI17_foehn_phenomena)	C++14	30 / 100	7 ms	1016 KiB

foehn_phenomena

#include <bits/stdc++.h>

#define fi first
#define se second
#define mp make_pair
#define pb push_back

using namespace std;
typedef long long ll;

const int maxn = 3e4 + 5;

int N, Q, S, T;
int a[maxn];
ll res = 0;

void add(int pos, int val)
{
  if (pos == N) return;
  res -= 1ll * a[pos] * (a[pos] < 0 ? S : T);
  a[pos] += val;
  res += 1ll * a[pos] * (a[pos] < 0 ? S : T);
}

signed main(void)
{
  ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
  if (fopen("A.INP", "r")){
    freopen("A.INP", "r", stdin);
    freopen("A.OUT", "w", stdout);
  }
  cin >> N >> Q >> S >> T;
  for (int i = 0; i <= N; ++i){
    cin >> a[i];
  }
  for (int i = 0; i < N; ++i){
    int x = a[i] - a[i + 1]; a[i] = 0;
    add(i, x);
  }
  while (Q--){
    int l, r, val; cin >> l >> r >> val;
    add(l - 1, -val); add(r, val);
    cout << res << '\n';
  }
}

Compilation message (stderr)

foehn_phenomena.cpp: In function 'int main()':
foehn_phenomena.cpp:29:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
     freopen("A.INP", "r", stdin);
     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~
foehn_phenomena.cpp:30:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
     freopen("A.OUT", "w", stdout);
     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~

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