Submission #40835

#	Time	Username	Problem	Language	Result	Execution time	Memory
40835		Hassoony	Vudu (COCI15_vudu)	C++14	56 / 140	1097 ms	65536 KiB

vudu

#include<bits/stdc++.h>
#include<unordered_map>
using namespace std;
typedef long long ll;
typedef double D;
const ll inf=(1ll<<61);
const int mod=1e9+7;
const int MX=1e6+9;
int n,bit[MX];
ll a[MX],p,prf[MX];
map<ll,int>hashy;
void add(int x){
    while(x<MX){
        bit[x]++;
        x+=x&-x;
    }
}
int get(int x){
    int ret=0;
    while(x){
        ret+=bit[x];
        x-=x&-x;
    }
    return ret;
}
int main(){
    scanf("%d",&n);
    for(int i=1;i<=n;i++){
        scanf("%lld",&a[i]);
    }
    scanf("%lld",&p);
    for(int i=1;i<=n;i++){
        a[i]-=p;
        prf[i]+=a[i]+prf[i-1];
        hashy[prf[i]]=1;
    }
    hashy[0]=1;
    int tt=0;
    for(auto pp:hashy){
        hashy[pp.first]=++tt;
    }
   // cout<<hashy[0]<<endl;

    add(hashy[0]);
    ll ans=0;
    for(int i=1;i<=n;i++){
        prf[i]=hashy[prf[i]];
  //      cout<<prf[i]<<" ";
        ans+=get(prf[i]);
        add(prf[i]);
    }
//    cout<<endl;
    cout<<ans<<endl;
}

Compilation message (stderr)

vudu.cpp: In function 'int main()':
vudu.cpp:27:19: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d",&n);
                   ^
vudu.cpp:29:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%lld",&a[i]);
                            ^
vudu.cpp:31:21: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%lld",&p);
                     ^

• Subtask 1: 56 / 140