제출 #335632

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
335632		Joshc	Vudu (COCI15_vudu)	C++11	140 / 140	324 ms	31796 KiB

vudu

#include <cstdio>
#include <vector>
#include <algorithm>
using namespace std;
 
#define ll long long
#define f first
#define s second

ll l[1000001];
int bit[1000001], m[1000001];
 
int main() {
    ll n, p, count=1, ans=0;
    scanf("%lld", &n);
    for (int i=1; i<=n; i++) scanf("%lld", &l[i]);
    scanf("%lld", &p);
    l[0] = 0;
    for (int i=1; i<=n; i++) l[i] = l[i-1]+l[i]-p;
    vector<pair<ll, int> > arr;
    for (int i=0; i<=n; i++) arr.emplace_back(l[i], i);
    sort(arr.begin(), arr.end());
    m[arr[0].s] = 1;
    for (int i=1; i<=n; i++) {
        if (arr[i].f != arr[i-1].f) count++;
        m[arr[i].s] = count;
    }
    for (int i=n; i>=0; i--) {
        for (int j=m[i]; j<=n; j+=j&-j) bit[j]++;
        for (int j=m[i]-1; j>0; j-=j&-j) ans += bit[j];
    }
    printf("%lld\n", n*(n+1)/2-ans);
}

컴파일 시 표준 에러 (stderr) 메시지

vudu.cpp: In function 'int main()':
vudu.cpp:15:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   15 |     scanf("%lld", &n);
      |     ~~~~~^~~~~~~~~~~~
vudu.cpp:16:35: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   16 |     for (int i=1; i<=n; i++) scanf("%lld", &l[i]);
      |                              ~~~~~^~~~~~~~~~~~~~~
vudu.cpp:17:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   17 |     scanf("%lld", &p);
      |     ~~~~~^~~~~~~~~~~~

• Subtask 1: 140 / 140