제출 #519694

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
519694		Killer2501	Vudu (COCI15_vudu)	C++14	140 / 140	404 ms	56980 KiB

vudu

#include <bits/stdc++.h>
#define ll long long
#define ld double
#define ull unsigned long long
#define pb push_back
#define pll pair<ll, ll>
#define pii pair<int, int>
#define fi first
#define se second
using namespace std;
const int N = 1e6+5;
const int M = 1e2+2;
const ll base = 1e4;
const ll mod = 998244353;
const int inf = 1e9;
const double ex = 1e-9;
int k, t,  n;
int a[N], b[N], tong, m, fe[N];
ll ans, sum[N];
pii mx[N];
vector<ll> vi, adj[N];
mt19937_64 mt(chrono::steady_clock::now().time_since_epoch().count());
void add(int id, int x)
{
    for(; id <= n+1; id += id & -id)fe[id] += x;
}
int get(int id)
{
    int res = 0;
    for(; id; id -= id & -id)res += fe[id];
    return res;
}
int lwr(ll x)
{
    return lower_bound(vi.begin(), vi.end(), x) - vi.begin() + 1;
}
void sol(int icase)
{
    cin >> n;
    for(int i = 1; i <= n; i ++)cin >> a[i];
    cin >> k;
    for(int i = 1; i <= n; i ++)
    {
        sum[i] = sum[i-1] + a[i] - k;
        vi.pb(sum[i]);
    }
    vi.pb(sum[0]);
    sort(vi.begin(), vi.end());
    vi.erase(unique(vi.begin(), vi.end()), vi.end());
    add(lwr(0), 1);
    for(int i = 1; i <= n; i ++)
    {
        ans = ans + get(lwr(sum[i]));
        add(lwr(sum[i]), 1);
    }
    cout << ans;
}
int main()
{
    cin.tie(0);
    cout.tie(0);
    ios_base::sync_with_stdio(0);
    #define task "test"
    if(fopen(task".inp", "r"))
	{
		freopen(task".inp", "r", stdin);
		freopen(task".out", "w", stdout);
	}
    int test = 1;
    //cin >> test;
    for(int i = 1; i <= test; i ++)sol(i);
    return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

vudu.cpp: In function 'int main()':
vudu.cpp:66:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   66 |   freopen(task".inp", "r", stdin);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
vudu.cpp:67:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   67 |   freopen(task".out", "w", stdout);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 140 / 140