Submission #891576

#	Time	Username	Problem	Language	Result	Execution time	Memory
891576		hmuhmuhmu	Sum Zero (RMI20_sumzero)	C++14	0 / 100	2 ms	2652 KiB

sumzero

#include <bits/stdc++.h>
#define f first
#define s second
#define pb push_back
#define mp make_pair
#define ll long long
#define ldb long double
#define db double
#define fin(x) freopen(x,"r",stdin)
#define fout(x) freopen(x,"w",stdout)
#define fo(i,l,r) for(int i=(l);i<=(r);i++)
#define foi(i,l,r) for(int i=(l);i>=(r);i--)
#define el cout<<'\n';
#define cel cerr<<'\n';
#define all(x) x.begin(),x.end()
#define ii pair<int,int>
#define iii pair<int,ii>
#define gb(x,i) (((x)>>(i))&1)
#define mask(i) (1LL<<(i))
#define TIME (1.0 * clock()/CLOCKS_PER_SEC)
using namespace std;
const int N=4e5+5;
const int bl=350;
const ll base=1e9+7;
const ll inf=1e9;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
ll Rand(ll l,ll r)
{
    return l+(1ll*rng()*rng()%(r-l+1)+(r-l+1))%(r-l+1);
}
template<class X,class Y>bool maximize(X &a,Y b)
{
    if(a<b) return a=b,true;
    return false;
}
template<class X,class Y>bool minimize(X &a, Y b)
{
    if(a>b) return a=b,true;
    return false;
}
void add(auto &a,auto b)
{
    a+=b;
    if(a>=base) a-=base;
    if(a<0) a+=base;
}
int n,x,nxt[N][20],q;
ll sum[N];
unordered_map<ll,int>cc;
void solve()
{
    int l,r,ans=0;
    cin>>l>>r,l--;
    foi(i,19,0) if(nxt[l][i] and nxt[l][i]<=r) ans+=mask(i),l=nxt[l][i];
    cout<<ans,el
}
int main()
{
    #define task "o"
    if(fopen(task".inp","r"))
    {
        fin(task".inp");
        fout(task".out");
    }
    srand(time(NULL));
    ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    cin>>n;
    fo(i,1,n) cin>>x,sum[i]=sum[i-1]+x;
    nxt[n+1][0]=n+1;
    foi(i,n,0)
    {
        if(cc.count(sum[i])) nxt[i][0]=min(nxt[i+1][0],cc[sum[i]]);
        else nxt[i][0]=nxt[i+1][0];
        cc[sum[i]]=i;
    }
    fo(x,1,log2(n+1)) fo(i,0,n-mask(x)+1)
    {
        if(nxt[i][x-1]==n+1) nxt[i][x]=n+1;
        else nxt[i][x]=nxt[nxt[i][x-1]][x-1];
    }
    cin>>q;
    while(q--) solve();
    cerr<<"Time elapsed: "<<TIME<<" s.\n";
}

Compilation message (stderr)

sumzero.cpp:41:10: warning: use of 'auto' in parameter declaration only available with '-fconcepts-ts'
   41 | void add(auto &a,auto b)
      |          ^~~~
sumzero.cpp:41:18: warning: use of 'auto' in parameter declaration only available with '-fconcepts-ts'
   41 | void add(auto &a,auto b)
      |                  ^~~~
sumzero.cpp: In function 'int main()':
sumzero.cpp:9:23: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    9 | #define fin(x) freopen(x,"r",stdin)
      |                ~~~~~~~^~~~~~~~~~~~~
sumzero.cpp:62:9: note: in expansion of macro 'fin'
   62 |         fin(task".inp");
      |         ^~~
sumzero.cpp:10:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   10 | #define fout(x) freopen(x,"w",stdout)
      |                 ~~~~~~~^~~~~~~~~~~~~~
sumzero.cpp:63:9: note: in expansion of macro 'fout'
   63 |         fout(task".out");
      |         ^~~~

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