Submission #1246742

#	Time	Username	Problem	Language	Result	Execution time	Memory
1246742		hainam2k9	Sum Zero (RMI20_sumzero)	C++20	61 / 100	495 ms	29892 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[10][MAXN];
int LG=0,pow4[]={1,4,16,64,256,1024,4096,16384,65536,262144};
map<ll,int> pos;
void calcLG(int n){
    while(n>=4) ++LG, n/=4;
}
int main()
{
    tt;
    if(fopen((NAME + ".INP").c_str(), "r")) fo;
    cin >> n;
    for(int i = 1; i<=n; ++i)
        cin >> a[i];
    calcLG(n);
    memset(nxt,0x3f,sizeof(nxt));
    pos[0]=n+1;
    ll sum=0;
    for(int i = n; i>0; --i){
        sum+=a[i];
        if(pos.count(sum)) nxt[0][i]=pos[sum]-1;
        nxt[0][i]=min(nxt[0][i],nxt[0][i+1]);
        pos[sum]=i;
    }
    for(int j = 1; j<=LG; ++j){
        for(int i = 1; i<=n; ++i){
            int cur=nxt[j-1][i];
            for(int k = 1; k<=3; ++k)
                if(cur<=n) cur=nxt[j-1][cur+1];
            nxt[j][i]=cur;
        }
    }
    cin >> q;
    while(q--){
        int l,r,rs=0;
        cin >> l >> r;
        for(int i = LG; i>=0; --i){
            int cur=nxt[i][l],cnt=1;
            if(cur>r) continue;
            for(int j = 1; j<=2; ++j)
                if(cur<=n&&nxt[i][cur+1]<=r) ++cnt, cur=nxt[i][cur+1];
            rs+=cnt*pow4[i], l=cur+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:31:45: note: in expansion of macro 'fo'
   31 |     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:31:45: note: in expansion of macro 'fo'
   31 |     if(fopen((NAME + ".INP").c_str(), "r")) fo;
      |                                             ^~

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