Submission #928916

#	Time	Username	Problem	Language	Result	Execution time	Memory
928916		winter0101	Sum Zero (RMI20_sumzero)	C++14	61 / 100	239 ms	29252 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;
vector<int>g[maxn];
int bit[maxn];
int n,tme=0;
vector<int>in,out;
void dfs(int u){
in[u]=++tme;
for (auto v:g[u]){
dfs(v);
}
out[u]=tme;
}
void add(int pos,int val){
for(;pos<=n;pos+=(pos-(pos&(pos-1))))bit[pos]+=val;
}
void add(int l,int r,int val){
add(l,val);
add(r+1,-val);
}
int get(int pos){
int sum=0;
for(;pos>=1;pos-=(pos-(pos&(pos-1))))sum+=bit[pos];
return sum;
}
int lep[maxn];
signed main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    //freopen("temp.INP","r",stdin);
    //freopen("temp.OUT","w",stdout);
    cin>>n;
    vector<pli>a(n+1);
    for1(i,1,n){
    cin>>a[i].fi;
    a[i].fi+=a[i-1].fi;
    a[i].se=i;
    }
    a[0].fi=a[0].se=0;
    sort(all(a));
    vector<int>nxt(n+1);
    for1(i,0,n){
    nxt[a[i].se+1]=n+1;
    if (i<n&&a[i].fi==a[i+1].fi){
    nxt[a[i].se+1]=a[i+1].se;
    }
    }
    vector<pli>().swap(a);
    for2(i,n-1,1)nxt[i]=min(nxt[i],nxt[i+1]);
    auto f=[&](int u){
    int l=u,r=n,ans=u;
    while (l<=r){
    int mid=(l+r)/2;
    if (nxt[mid]==nxt[u]){
    l=mid+1;
    ans=mid;
    }
    else r=mid-1;
    }
    return ans;
    };
    for2(i,n,1){
    if (i<n&&nxt[i]==nxt[i+1]){
    continue;
    }
    if (nxt[i]+1>n){
    g[0].pb(i);
    }
    else {
    g[f(nxt[i]+1)].pb(i);
    }
    }
    in.resize(n+1),out.resize(n+1);
    dfs(0);
    for1(i,0,n)vector<int>().swap(g[i]);
    int q;
    cin>>q;
    for1(i,1,q){
    int r;
    cin>>lep[i]>>r;
    g[r].pb(i);
    }
    int p=1;
    for1(i,1,n){
    while (nxt[p]<i&&p<i){
    p++;
    //cerr<<p<<'\n';
    }
    if (nxt[p]==i){
    for1(j,p,i){
    if (nxt[j]>i)break;
    p=j;
    if (f(j)==j){
    add(in[j],out[j],1);
    }
    }
    }
    for (auto v:g[i]){
    lep[v]=get(in[f(lep[v])]);
    }
    vector<int>().swap(g[i]);
    }
    for1(i,1,q)cout<<lep[i]<<'\n';
}

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