Submission #1332512

#	Time	Username	Problem	Language	Result	Execution time	Memory
1332512		lnt314	Sum Zero (RMI20_sumzero)	C++20	61 / 100	420 ms	42260 KiB

sumzero

// Frozen Forest (")>
#include <bits/stdc++.h>
#define NAME ""
#define ll long long
#define fi first
#define se second
#define vec vector
#define ALL(x) (x).begin(),(x).end()
#define SZ(x) ((int)x.size())
using namespace std;
const int N=4e5+5;
int n,q;
int c[N];
void INIT(){
    cin>>n;
    for(int i=1;i<=n;i++) cin>>c[i];
    cin>>q;
}

vec<ll> ps;
vec<int> op;
vec<vec<int>> jp;
void SOLVE(){
    ps=vec<ll>(n+5,0);
    for(int i=1;i<=n;i++) ps[i]=ps[i-1]+c[i];
    map<ll,int> las;
    las[0]=0;
    op=vec<int>(n+5,n+1);
    for(int i=1;i<=n;i++){
        if(las.find(ps[i])!=las.end()){
            op[las[ps[i]]+1]=i;
        }
        las[ps[i]]=i;
    }
    vec<ll>().swap(ps);
    map<ll,int>().swap(las);
    jp=vec<vec<int>>(__lg(n)+5,vec<int>(n+5,n+1));
    for(int i=n;i>0;i--){
        jp[0][i]=min(jp[0][i+1],op[i]);
    }
    vec<int>().swap(op);
    for(int j=1;(1<<j)<=n;j++){
        for(int i=0;i<=n;i++){
            jp[j][i]=jp[j-1][jp[j-1][i]+1];
        }
    }
    while(q--){
        int l,r;
        cin>>l>>r;
        int ans=0,u=l;
        for(int i=SZ(jp)-1;i>=0;i--){
            if(jp[i][u]>r) continue;
            u=jp[i][u]+1;
            ans+=(1<<i);
        }   
        cout<<ans<<'\n';
    }
}

int main(){
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	if(fopen(NAME ".inp","r")){
		freopen(NAME ".inp","r",stdin);
		freopen(NAME ".out","w",stdout);
	}
	INIT();SOLVE();
}

Compilation message (stderr)

sumzero.cpp: In function 'int main()':
sumzero.cpp:64:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   64 |                 freopen(NAME ".inp","r",stdin);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
sumzero.cpp:65:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   65 |                 freopen(NAME ".out","w",stdout);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

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