Submission #1276088

#	Time	Username	Problem	Language	Result	Execution time	Memory
1276088		chanhchuong123	Vudu (COCI15_vudu)	C++20	140 / 140	237 ms	16140 KiB

vudu

#include<bits/stdc++.h>
using namespace std;

const bool multiTest = false;
#define task "C"
#define fi first
#define se second
#define MASK(i) (1LL << (i))
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define BIT(mask, i) ((mask) >> (i) & 1)

template<typename T1, typename T2> bool minimize(T1 &a, T2 b) {
	if (a > b) a = b; else return 0; return 1;
}
template<typename T1, typename T2> bool maximize(T1 &a, T2 b) {
	if (a < b) a = b; else return 0; return 1;
}

const int MAX = 1000100;
int N, P;
int a[MAX];
int bit[MAX];
long long sum;
vector<long long> values;

void update(int id, int delta) {
    for (; id <= N + 5; id += id & -id)
        bit[id] += delta;
}

int get(int id) {
    int res = 0;
    for (; id > 0; id -= id & -id)
        res += bit[id];
    return res;
}

void process(void) {
    cin >> N;
    for (int i = 1; i <= N; ++i) {
        cin >> a[i];
    }
    cin >> P;

    sum = 0;
    values.push_back(0);
    for (int i = 1; i <= N; ++i) {
        sum += a[i];
        values.push_back(sum - 1LL * P * i);
    }

    sort(all(values));
    values.resize(unique(all(values)) - values.begin());

    long long res = 0;
    sum = 0;
    for (int i = 0; i <= N; ++i) {
        sum += a[i];
        a[i] = lower_bound(all(values), sum - 1LL * P * i) - values.begin() + 1;

        res += get(a[i]);
        update(a[i], +1);
    }
    cout << res;
}

int main(void) {
	ios_base::sync_with_stdio(false); cin.tie(nullptr); cout.tie(nullptr);
	if (fopen(task".inp", "r")) {
		freopen(task".inp", "r",  stdin);
		freopen(task".out", "w", stdout);
	}

	int nTest = 1; if (multiTest) cin >> nTest;
	while (nTest--) {
		process();
	}

	return 0;
}

Compilation message (stderr)

vudu.cpp: In function 'int main()':
vudu.cpp:71:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   71 |                 freopen(task".inp", "r",  stdin);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
vudu.cpp:72:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   72 |                 freopen(task".out", "w", stdout);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 140 / 140