제출 #1137365

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1137365		mnbvcxz123	Vudu (COCI15_vudu)	C++20	140 / 140	231 ms	27820 KiB

vudu

#include <cstdio>
#include <cmath>
#include <vector>
#include <algorithm>
#include <cstring>

using namespace std;

const int MAXN = 1 << 20;
typedef pair<double, int> pdi;

int n;
double a[MAXN];

int loga[MAXN];
void update(int pos) {
    pos += 10;
    while (pos < MAXN) {
        ++loga[pos];
        pos += pos & -pos;
    }
}

int query(int pos) {
    pos += 10;
    int ret = 0;
    while (pos > 0) {
        ret += loga[pos];
        pos -= pos & -pos;
    }
    return ret;
}

int main(void) {
    scanf("%d", &n);
    for (int i = 0; i < n; ++i) scanf("%lf", &a[i]);
    int p;
    scanf("%d", &p);

    for (int i = 0; i < n; ++i) {
        a[i] -= p;
        if (i > 0) a[i] += a[i - 1];
    }

    vector<pdi> V;
    for (int i = 0; i < n; ++i)
        V.push_back(pdi(a[i], i));
    V.push_back(pdi(0, -1));

    sort(V.begin(), V.end());
    int pos = 0;
    long long ans = 0;
    for (int i = 0; i < V.size(); ++i) {
        while (pos < i && (V[i].first - V[pos].first) >= 0) update(V[pos++].second);
        ans += query(V[i].second);
    }

    printf("%lld\n", ans);

    return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

vudu.cpp: In function 'int main()':
vudu.cpp:35:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   35 |     scanf("%d", &n);
      |     ~~~~~^~~~~~~~~~
vudu.cpp:36:38: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   36 |     for (int i = 0; i < n; ++i) scanf("%lf", &a[i]);
      |                                 ~~~~~^~~~~~~~~~~~~~
vudu.cpp:38:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   38 |     scanf("%d", &p);
      |     ~~~~~^~~~~~~~~~

• Subtask 1: 140 / 140