Submission #726102

#	Time	Username	Problem	Language	Result	Execution time	Memory
726102		anusha777	Sum Zero (RMI20_sumzero)	C++14	0 / 100	14 ms	1492 KiB

sumzero

#include <bits/stdc++.h>
#define fast 			ios::sync_with_stdio(0); cin.tie(NULL);cout.tie(NULL)
#define sz(x)			(int)((x).size())
#define pb				push_back
#define vi				vector<int>
#define vb				vector<bool>
#define vvb				vector<vb>
#define pi				pair<int,int>
#define vpi				vector<pi>
#define vvi				vector<vi>
#define vc				vector<char>
#define all(x)			x.begin(), x.end()
#define rall(x)			x.rbegin(), x.rend()
#define pbb()			pop_back()
//#define f				first
#define s				second
#define ll				long long
#define int				long long
#define ull				unsigned long long
#define line               cout<<"_____________________________"<<endl;
#define forr(i, a, b)      for(int i=a; i<b; i++)
const int N=50000+1, mod=1e9+7, inf=1e18+1;
using namespace std;
//vi dx= { 0, 1, 0 , -1} , dy= {-1,0, 1, 0};
void setIO(string filename)
{
    freopen((filename + ".in").c_str(), "r", stdin);
    freopen((filename + ".out").c_str(), "w", stdout);
}
int a[5000+1]={0};
vvi jump;
int walk(int u, int h)
{
    for(int i=0, x=1; i<20; i++, x*=2) if((h&x)==x) u= jump[u][i];
    return u;
}
void task()
{
    int n;
    cin>>n;
    forr(i, 0, n) cin>>a[i];
    jump.resize(n+2, vi(20, n+1));
    // if no jump: then n+1 th element
    map<int, int> lastp;
    int p=0;
    lastp[0]=n;
    for(int i=n-1; i>=0; i--)
    {
        p+=a[i];
        int r= lastp[p];
        jump[i][0]= jump[i+1][0];
        if(r!=0) jump[i][0]=r;
        lastp[p]=i;
        forr(j, 1, 20) jump[i][j]= min(jump[jump[i][j-1]][j-1], jump[i+1][j]);
    }
    int q;
    cin>>q;
    while(q--)
    {
        int L, R;
        
        cin >> L >> R;
        L--;
        int l=0, r=n+1;
        while(r>l+1)
        {
            int m= (l+r)/2, x= walk(L, m);
            if(x<=R) l=m;
            else r=m;
        }
        cout<<l<<endl;
    }
}
signed main()
{
    fast;
    int t;
    t=1;
    //cin>>t;
    while(t--) task();
}

Compilation message (stderr)

sumzero.cpp: In function 'void setIO(std::string)':
sumzero.cpp:27:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   27 |     freopen((filename + ".in").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
sumzero.cpp:28:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   28 |     freopen((filename + ".out").c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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