Submission #335630

#	Time	Username	Problem	Language	Result	Execution time	Memory
335630		Joshc	Vudu (COCI15_vudu)	C++11	112 / 140	1087 ms	65536 KiB

vudu

#include <cstdio>
#include <vector>
#include <algorithm>
#include <unordered_map>
using namespace std;

long long int l[1000001];
int bit[1000001];

int main() {
    long long int 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<long long int> arr;
    arr.reserve(n+1);
    for (int i=0; i<=n; i++) arr.push_back(l[i]);
    unordered_map<long long int, long long int> m;
    sort(arr.begin(), arr.end());
    m[arr[0]] = 1;
    for (int i=1; i<=n; i++) {
        if (arr[i] != arr[i-1]) m[arr[i]] = ++count;
    }
    for (int i=n; i>=0; i--) {
        for (long long int j=m[l[i]]; j<=n; j+=j&-j) bit[j]++;
        for (long long int j=m[l[i]]-1; j>0; j-=j&-j) ans += bit[j];
    }
    printf("%lld\n", n*(n+1)/2-ans);
}

Compilation message (stderr)

vudu.cpp: In function 'int main()':
vudu.cpp:12:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   12 |     scanf("%lld", &n);
      |     ~~~~~^~~~~~~~~~~~
vudu.cpp:13:35: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   13 |     for (int i=1; i<=n; i++) scanf("%lld", &l[i]);
      |                              ~~~~~^~~~~~~~~~~~~~~
vudu.cpp:14:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   14 |     scanf("%lld", &p);
      |     ~~~~~^~~~~~~~~~~~

• Subtask 1: 112 / 140