Submission #1246717

#	Time	Username	Problem	Language	Result	Execution time	Memory
1246717		hainam2k9	Sum Zero (RMI20_sumzero)	C++20	0 / 100	2 ms	840 KiB

sumzero

#include <bits/stdc++.h>
#define tt cin.tie(0), cout.tie(0), ios_base::sync_with_stdio(0)
#define fo freopen((NAME+".INP").c_str(), "r", stdin), freopen((NAME+".OUT").c_str(), "w", stdout)
#define ll long long
#define ull unsigned long long
#define i128 __int128
#define db long double
#define sz(a) ((int)(a).size())
#define pb emplace_back
#define pf emplace_front
#define pob pop_back
#define pof pop_front
#define lb lower_bound
#define ub upper_bound
#define fi first
#define se second
#define ins emplace
#define mp make_pair
using namespace std;
const int MOD = 1e9+7, MAXN = 4e5+5;
const string NAME = "";
int n,q,a[MAXN];
map<ll,int> pos;
int main()
{
    tt;
    if(fopen((NAME + ".INP").c_str(), "r")) fo;
    cin >> n;
    for(int i = 1; i<=n; ++i)
        cin >> a[i];
    int nxt[n+5][__lg(n)+1];
    memset(nxt,0x3f,sizeof(nxt));
    ll sum=0;
    for(int i = n; i>0; --i){
        sum+=a[i];
        nxt[i][0]=(pos[sum]==0 ? n+1 : pos[sum]-1);
        nxt[i][0]=min(nxt[i][0],nxt[i+1][0]);
        pos[sum]=i;
        for(int j = 1; j<=__lg(n); ++j)
            if(nxt[i][j-1]<n)  nxt[i][j]=nxt[nxt[i][j-1]+1][j-1];
    }
    cin >> q;
    while(q--){
        int l,r,rs=0;
        cin >> l >> r;
        for(int i = __lg(n); i>=0; --i)
            if(nxt[l][i]<=r) rs|=1<<i, l=nxt[l][i]+1;
        cout << rs << "\n";
    }
}

Compilation message (stderr)

sumzero.cpp: In function 'int main()':
sumzero.cpp:3:19: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    3 | #define fo freopen((NAME+".INP").c_str(), "r", stdin), freopen((NAME+".OUT").c_str(), "w", stdout)
      |            ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
sumzero.cpp:27:45: note: in expansion of macro 'fo'
   27 |     if(fopen((NAME + ".INP").c_str(), "r")) fo;
      |                                             ^~
sumzero.cpp:3:63: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    3 | #define fo freopen((NAME+".INP").c_str(), "r", stdin), freopen((NAME+".OUT").c_str(), "w", stdout)
      |                                                        ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
sumzero.cpp:27:45: note: in expansion of macro 'fo'
   27 |     if(fopen((NAME + ".INP").c_str(), "r")) fo;
      |                                             ^~

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