Submission #165492

#	Time	Username	Problem	Language	Result	Execution time	Memory
165492		Atill83	Vudu (COCI15_vudu)	C++14	140 / 140	354 ms	31608 KiB

vudu

#include <bits/stdc++.h>
#define ff first
#define ss second
#define endl '\n'
using namespace std;
const long long INF = (long long) 1e18;
const int mod = (int) 1e9+7;
const int MAXN = (int) 1e6+5;

typedef long long ll;
typedef unsigned long long ull;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;
ll n;
int a[MAXN];
ll pre[MAXN];
pair<ll, int> s[MAXN];
int t[MAXN];

void upd(int pos){
    pos += 2;
    for(;pos < MAXN; pos += (pos & -pos)){
        t[pos]++;
    }
}

int get(int pos){
    pos += 2;
    ll res = 0;
    for(; pos > 0; pos -= (pos &-pos))
        res += t[pos];
    return res;
}

int main(){


    #ifdef Local
        freopen("../IO/int.txt","r",stdin);
        freopen("../IO/out.txt","w",stdout);
    #endif

    scanf("%lld", &n);

    for(ll i = 1; i <= n; i++){
        scanf("%lld", a + i);
        pre[i] = pre[i - 1] + a[i];
    }

    ll P;
    scanf("%lld", &P);
    s[0] = {0, -1};

    for(ll i = 1; i <= n; i++){
        s[i] = {pre[i] - i*P, i};
    }
    sort(s, s + n + 1);
    ll ans = 0;
    int pos = 0;
    for(ll i = 0; i <= n; i++){
        while(pos < i &&  s[i].ff >= s[pos].ff) upd(s[pos++].ss);
        ans += get(s[i].ss);
    }
    printf("%lld", ans);
    #ifdef Local
        cout<<endl<<fixed<<setprecision(2)<<1000.0 * clock() / CLOCKS_PER_SEC<< " milliseconds ";
    #endif
}

Compilation message (stderr)

vudu.cpp: In function 'int main()':
vudu.cpp:46:28: warning: format '%lld' expects argument of type 'long long int*', but argument 2 has type 'int*' [-Wformat=]
         scanf("%lld", a + i);
                       ~~~~~^
vudu.cpp:43:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%lld", &n);
     ~~~~~^~~~~~~~~~~~
vudu.cpp:46:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%lld", a + i);
         ~~~~~^~~~~~~~~~~~~~~
vudu.cpp:51:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%lld", &P);
     ~~~~~^~~~~~~~~~~~

• Subtask 1: 140 / 140