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#include<bits/stdc++.h>
using namespace std ;
#define maxn 400009
#define ll long long
#define fi first
#define se second
#define pb push_back
#define left id<<1
#define right id<<1|1
#define re exit(0);
#define _lower(x) lower_bound(v.begin(),v.end(),x)-v.begin()
#define TIME 1.0*clock()/CLOCKS_PER_SEC
const int mod = 1e9+7;
const int INF = 1e9;
typedef vector<int> vi;
typedef pair<int,int> pii;
typedef vector<pii> vii;
typedef vector<ll> vl;
void add ( int &a , int b )
{
a += b ;
if ( a > mod ) a -= mod ;
if ( a < 0 ) a += mod ;
}
template <typename T> void chkmin ( T &a , T b ) { if ( a > b ) a = b ; }
template <typename T> void chkmax ( T &a , T b ) { if ( a < b ) a = b ; }
int _pow ( int a , int n )
{
if ( n == 0 ) return 1 ;
int res = _pow (a,n/2) ;
if ( n % 2 ) return 1ll*res*res%mod*a%mod ;
else return 1ll*res*res%mod ;
}
void rf ()
{
freopen ("bai1.inp","r",stdin) ;
}
const int LOG = 2 ;
int n , nq ;
int a [maxn] ;
int L [maxn][3] ;
int nxt [maxn] ;
const int B = 7 ;
void build ()
{
ll sum = 0 ;
unordered_map <ll,int> mp ;
mp [0] = n+1 ;
memset ( nxt , 0x3f , sizeof nxt ) ;
for ( int i = n ; i >= 1 ; i -- )
{
sum += a [i] ;
if ( mp [sum] ) nxt [i] = mp [sum] - 1 ;
chkmin (nxt[i],nxt[i+1]) ;
mp [sum] = i ;
}
memset ( L , 0x3f , sizeof L ) ;
for ( int i = 1 ; i <= n ; i ++ ) L [i][0] = nxt [i] ;
for ( int j = 1 ; j <= LOG ; j ++ )
{
for ( int i = 1 ; i <= n ; i ++ )
{
if ( L[i][j-1] <= n ) L [i][j] = L [i][j-1] ;
else
{
L [i][j] = INF ;
continue ;
}
for ( int t = 1 ; t < (1<<B) ; t ++ )
{
if ( L [i][j] <= n ) L [i][j] = L [L[i][j]+1][j-1] ;
else
{
L [i][j] = INF ; break ;
}
}
}
}
}
int main ()
{
ios_base::sync_with_stdio(0);
cin.tie(0);cout.tie(0);
// rf () ;
cin >> n ;
for ( int i = 1 ; i <= n ; i ++ ) cin >> a [i] ;
build () ;
cin >> nq ;
while ( nq -- )
{
int l , r ; cin >> l >> r ;
int res = 0 ;
for ( int j = LOG ; j >= 0 ; j -- )
{
while ( L [l][j] <= r )
{
res += 1<<(B*j) ;
l = L [l][j]+1 ;
}
}
cout << res << "\n" ;
}
}
컴파일 시 표준 에러 (stderr) 메시지
sumzero.cpp: In function 'void rf()':
sumzero.cpp:42:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
42 | freopen ("bai1.inp","r",stdin) ;
| ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
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