Submission #114262

#	Time	Username	Problem	Language	Result	Execution time	Memory
114262		kimjg1119	Foehn Phenomena (JOI17_foehn_phenomena)	C++17	100 / 100	188 ms	11484 KiB

foehn_phenomena

#include <bits/stdc++.h>
#define MAXN 200005

using namespace std;
typedef long long ll;

ll sig[MAXN];
ll n, q, s, t, temp = 0;

ll pre(ll k) {
	if (k >= 0) return -s * k;
	else return -t * k;
}

ll func(ll pos, ll diff) {
	ll a = pre(sig[pos]), b = pre(sig[pos] + diff);
	return b - a;
}

int main() {
	scanf("%lld %lld %lld %lld", &n, &q, &s, &t);
	ll bf; scanf("%lld", &bf);
	for (int i = 1; i <= n; i++) {
		ll tz;
		scanf("%lld", &tz);
		sig[i] = tz - bf;
		bf = tz;
		if (sig[i] >= 0) temp -= sig[i] * s;
		else temp -= sig[i] * t;
	}
	while (q--) {
		ll x, y, diff, ord;
		scanf("%lld %lld %lld", &x, &y, &diff);

		temp += func(x, diff);
		sig[x] += diff;
		if (y == n) diff = 0;
		temp += func(y + 1, -diff);
		sig[y + 1] -= diff;

		printf("%lld\n", temp);
	}
	return 0;
}

Compilation message (stderr)

foehn_phenomena.cpp: In function 'int main()':
foehn_phenomena.cpp:32:18: warning: unused variable 'ord' [-Wunused-variable]
   ll x, y, diff, ord;
                  ^~~
foehn_phenomena.cpp:21:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%lld %lld %lld %lld", &n, &q, &s, &t);
  ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
foehn_phenomena.cpp:22:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  ll bf; scanf("%lld", &bf);
         ~~~~~^~~~~~~~~~~~~
foehn_phenomena.cpp:25:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%lld", &tz);
   ~~~~~^~~~~~~~~~~~~
foehn_phenomena.cpp:33:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%lld %lld %lld", &x, &y, &diff);
   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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