Submission #726156

#	Time	Username	Problem	Language	Result	Execution time	Memory
726156		anusha777	Sum Zero (RMI20_sumzero)	C++14	0 / 100	9 ms	1748 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[400003]={0}, jump[400003][30]={0}, total[400003]={0};
int walk(int u, int h)
{
    for(int i=0, x=1; i<30; i++, x*=2ll) if((h&x)==x) u= jump[u][i];
    return u;
}
void task()
{
    int n;
    cin>>n;
    forr(i, 0, n) cin>>a[i];
    // if no jump: then n+1 th element
    for(int i=0; i<30; i++) jump[n+1][i]=jump[n][i]=n;
    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-1;
        lastp[p]=i;
        if(jump[i][0] != n) total[i]++;
        //cout<<i+1<<" next "<<jump[i][0]+1<<endl;
        forr(j, 1, 30)
        {
            jump[i][j]= jump[jump[i][j-1]+1][j-1];
            if(jump[i][j]==n) break;
          //  cout<<i+1<<" "<<j<<" "<<jump[i][j]+1<<endl;
        }
       // line;
    }
    int q;
    cin>>q;
    while(q--)
    {
        int L, R;
        cin >> L >> R;
        L--;
        R--;
        int res = 0;
        for (int j = 18; j >= 0; j--) if (jump[L][j] <= R) {
                res += (1 << j);
                L = jump[L][j];
            }
        cout<<res<<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