Submission #1284054

#	Time	Username	Problem	Language	Result	Execution time	Memory
1284054		baotoan655	Foehn Phenomena (JOI17_foehn_phenomena)	C++20	100 / 100	70 ms	7276 KiB

foehn_phenomena

#include <bits/stdc++.h>
#define file(name)  if (fopen(name".inp", "r")) { freopen(name".inp", "r", stdin); freopen(name".out", "w", stdout); }
using namespace std;

#define int long long
const int N = 2e5 + 5;
int n, q, s, t;
int a[N], diff[N];
int res = 0;
void upd(int i, int d) {
    int val = diff[i];
    if(val > 0) res -= d * s * val;
    else res += d * t * (-val);
}
int32_t main() {
    ios_base::sync_with_stdio(false);
    cin.tie(0), cout.tie(0);

    file("A") else file("task");
    cin >> n >> q >> s >> t;
    for(int i = 0; i <= n; ++i) cin >> a[i];
    for(int i = 1; i <= n; ++i) {
        diff[i] = a[i] - a[i - 1];
        upd(i, 1);
    }
    for(int _ = 1; _ <= q; ++_) {
        int l, r, x;
        cin >> l >> r >> x;
        if(r + 1 <= n) upd(r + 1, -1);
        upd(l, -1);
        diff[r + 1] -= x;
        diff[l] += x;
        if(r + 1 <= n) upd(r + 1, 1);
        upd(l, 1);
        cout << res << '\n';
    }
    return 0;
}

Compilation message (stderr)

foehn_phenomena.cpp: In function 'int32_t main()':
foehn_phenomena.cpp:2:58: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    2 | #define file(name)  if (fopen(name".inp", "r")) { freopen(name".inp", "r", stdin); freopen(name".out", "w", stdout); }
      |                                                   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
foehn_phenomena.cpp:19:5: note: in expansion of macro 'file'
   19 |     file("A") else file("task");
      |     ^~~~
foehn_phenomena.cpp:2:91: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    2 | #define file(name)  if (fopen(name".inp", "r")) { freopen(name".inp", "r", stdin); freopen(name".out", "w", stdout); }
      |                                                                                    ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
foehn_phenomena.cpp:19:5: note: in expansion of macro 'file'
   19 |     file("A") else file("task");
      |     ^~~~
foehn_phenomena.cpp:2:58: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    2 | #define file(name)  if (fopen(name".inp", "r")) { freopen(name".inp", "r", stdin); freopen(name".out", "w", stdout); }
      |                                                   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
foehn_phenomena.cpp:19:20: note: in expansion of macro 'file'
   19 |     file("A") else file("task");
      |                    ^~~~
foehn_phenomena.cpp:2:91: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    2 | #define file(name)  if (fopen(name".inp", "r")) { freopen(name".inp", "r", stdin); freopen(name".out", "w", stdout); }
      |                                                                                    ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
foehn_phenomena.cpp:19:20: note: in expansion of macro 'file'
   19 |     file("A") else file("task");
      |                    ^~~~

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