제출 #942631

#제출 시각아이디문제언어결과실행 시간메모리
942631thunoproSum Zero (RMI20_sumzero)C++14
22 / 100
4 ms1372 KiB
#include<bits/stdc++.h> using namespace std ; #define maxn 5009 #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 = 19 ; int n , nq ; int a [maxn] ; int L [maxn][20] ; int nxt [maxn] ; void build () { ll sum = 0 ; 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-(1<<j)+1 ; i ++ ) { if ( L [i][j-1] <= n ) L [i][j] = L[L[i][j-1]+1][j-1] ; } } } 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 i = LOG ; i >= 0 ; i -- ) { if ( L [l][i] <= r ) l = L [l][i] + 1 , res += (1<<i) ; } 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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