Submission #928840

#	Time	Username	Problem	Language	Result	Execution time	Memory
928840		winter0101	Sum Zero (RMI20_sumzero)	C++14	61 / 100	370 ms	56380 KiB

sumzero

#include<bits/stdc++.h>
using namespace std;
#define all(fl) fl.begin(),fl.end()
#define pb push_back
#define fi first
#define se second
#define for1(i,j,k) for(int i=j;i<=k;i++)
#define for2(i,j,k) for(int i=j;i>=k;i--)
#define for3(i,j,k,l) for(int i=j;i<=k;i+=l)
#define lb lower_bound
#define ub upper_bound
#define sz(a) (int)a.size()
#define pii pair<int,int>
#define pli pair<long long,int>
#define gcd __gcd
#define lcm(x,y) x*y/__gcd(x,y)
#define pil pair<int,long long>
const int maxn=4e5+9;
long long a[maxn];
int nxt[maxn];
int st[maxn][21];
signed main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    //freopen("temp.INP","r",stdin);
    //freopen("temp.OUT","w",stdout);
    int n;
    cin>>n;
    for1(i,1,n){
    cin>>a[i];
    a[i]+=a[i-1];
    }
    map<long long,int>f;
    for2(i,n,1){
    f[a[i]]=i;
    if (f.find(a[i-1])!=f.end()){
    nxt[i]=f[a[i-1]];
    }
    else nxt[i]=n+1;
    }
    for2(i,n-1,1)nxt[i]=min(nxt[i],nxt[i+1]);
    //for1(i,1,n)cout<<nxt[i]<<'\n';
    for1(i,1,n)st[i][0]=nxt[i];
    for1(j,1,20){
    for1(i,1,n){
    if (st[i][j-1]+1>n){
    st[i][j]=n+1;
    continue;
    }
    st[i][j]=st[st[i][j-1]+1][j-1];
    }
    }
    int q;
    cin>>q;
    for1(i,1,q){
    int l,r;
    cin>>l>>r;
    int ans=0;
    for2(j,20,0){
    if (l>r)break;
    if (st[l][j]<=r){
    ans+=(1<<j);
    l=st[l][j]+1;
    }
    }
    cout<<ans<<'\n';
    }
}

• Subtask 1: 22 / 22
• Subtask 2: 39 / 39
• Subtask 3: 0 / 39