Submission #1246752

#	Time	Username	Problem	Language	Result	Execution time	Memory
1246752		hainam2k9	Sum Zero (RMI20_sumzero)	C++20	100 / 100	284 ms	20964 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],nxt[MAXN],depth[MAXN],jump[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];
    nxt[n+1]=n+2;
    pos[0]=n+1;
    ll sum=0;
    for(int i = n; i>=0; --i){
        sum+=a[i];
        nxt[i]=(pos[sum]==0 ? n+1 : pos[sum]-1);
        nxt[i]=min(nxt[i],nxt[i+1]);
        pos[sum]=i;
    }
    for(int i = 1; i<=n; ++i)
        ++nxt[i];
    pos.clear();
    jump[n+1]=n+2, depth[n+1]=0;
    jump[n+2]=n+2, depth[n+2]=-1e9;
    for(int i = n; i>=0; --i){
        int p=nxt[i];
        depth[i]=depth[p]+1;
        if(depth[p]-depth[jump[p]]==depth[jump[p]]-depth[jump[jump[p]]]) jump[i]=jump[jump[p]];
        else jump[i]=p;
    }
    cin >> q;
    while(q--){
        int l,r,rs=0;
        cin >> l >> r;
        while(nxt[l]<=r+1){
            if(jump[l]<=r+1) rs+=depth[l]-depth[jump[l]], l=jump[l];
            else ++rs, l=nxt[l];
        }
        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: 22 / 22
• Subtask 2: 39 / 39
• Subtask 3: 39 / 39