Submission #40838

#	Time	Username	Problem	Language	Result	Execution time	Memory
40838		Hassoony	Vudu (COCI15_vudu)	C++14	56 / 140	1078 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];
int a[MX];
ll p,prf[MX];
unordered_map<ll,int>has;
vector<ll>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("%d",&a[i]);
    }
    ll sum=0;
    scanf("%lld",&p);
    for(int i=1;i<=n;i++){
        prf[i]+=a[i]-p+prf[i-1];
        hashy.push_back(prf[i]);
    }
    hashy.push_back(0);
    sort(hashy.begin(),hashy.end());
    int tt=0;
    for(auto pp:hashy){
        if(has[pp]==0)has[pp]=++tt;
    }
    add(has[0]);
    ll ans=0;
    int x;
    for(int i=1;i<=n;i++){
        x=has[prf[i]];
        ans+=get(x);
        add(x);
    }
//    cout<<endl;
    cout<<ans<<endl;
}

Compilation message (stderr)

vudu.cpp: In function 'int main()':
vudu.cpp:33:8: warning: unused variable 'sum' [-Wunused-variable]
     ll sum=0;
        ^
vudu.cpp:29:19: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d",&n);
                   ^
vudu.cpp:31:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d",&a[i]);
                          ^
vudu.cpp:34:21: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%lld",&p);
                     ^

• Subtask 1: 56 / 140