Submission #1099300

#	Time	Username	Problem	Language	Result	Execution time	Memory
1099300		LilPluton	Sum Zero (RMI20_sumzero)	C++14	61 / 100	743 ms	55380 KiB

sumzero

#include <bits/stdc++.h>
using namespace std;
template<typename T> bool umax(T &res, const T &val) { if (res < val){ res = val; return true; }; return false; }
template<typename T> bool umin(T &res, const T &val) { if (res > val){ res = val; return true; }; return false; }
 
const int sz = 1e6 + 5;
#define ll long long
 
 
struct DSU{
 
    vector<int>e;
    DSU(int n){
        e.assign(n + 1, -1);
    }
    int _find(int v){
        if(e[v] < 0){
            return v;
        }
        return e[v] = _find(e[v]);
    }
    int _union(int u,int v){
        u = _find(u);
        v = _find(v);
        if(u != v){
            if(e[u] > e[v]){
                swap(u, v);
            }
            e[u] += e[v];
            e[v] = u;
            return 1;
        }
        return 0;
    }
};
const int L = 19;
int a[sz];
ll pref[sz];
int up[L][sz];
 
void test_case(int testcase){
    int n;
    cin >> n;
    for(int i = 1; i <= n; ++i){
        cin >> a[i];
        pref[i] = pref[i - 1] + a[i];
    }
    map<ll,int> last;
    set<int>st;
    int mn = n + 1;

    for(int i = n; i > 0; --i){
        last[pref[i]] = i;
        if(last.count(pref[i - 1])){
            umin(mn, last[pref[i - 1]]);
        }
        up[0][i] = mn + 1;
    }
    for(int i = 0; i < L; ++i){
        up[i][n + 2] = up[i][n + 1] = n + 2;
    }
    for(int i = 1; i < L; ++i){
        for(int j = 1; j <= n; ++j){
            up[i][j] = min((int)(n + 2), up[i - 1][up[i - 1][j]]);
        }
    }



    int Q;
    cin >> Q;
    while(Q--){
        int l, r;
        cin >> l >> r;
        int res = 0;
        for(int i = 18; i >= 0; --i){
            if(up[i][l] <= r + 1){
                res += (1 << i);
                l = up[i][l];
            }
        }
        cout << res << endl;

    }

}
 
signed main(){
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);

    int T = 1;
    for(int test = 1; test <= T; ++test){
        test_case(test);
    } 
}
 
/*
    
*/

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