제출 #829553

#제출 시각아이디문제언어결과실행 시간메모리
829553GrindMachineSum Zero (RMI20_sumzero)C++17
61 / 100
354 ms47216 KiB
// Om Namah Shivaya #include <bits/stdc++.h> #include <ext/pb_ds/assoc_container.hpp> #include <ext/pb_ds/tree_policy.hpp> using namespace std; using namespace __gnu_pbds; template<typename T> using Tree = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>; typedef long long int ll; typedef long double ld; typedef pair<int, int> pii; typedef pair<ll, ll> pll; #define fastio ios_base::sync_with_stdio(false); cin.tie(NULL) #define pb push_back #define endl '\n' #define sz(a) a.size() #define setbits(x) __builtin_popcountll(x) #define ff first #define ss second #define conts continue #define ceil2(x, y) ((x + y - 1) / (y)) #define all(a) a.begin(), a.end() #define rall(a) a.rbegin(), a.rend() #define yes cout << "Yes" << endl #define no cout << "No" << endl #define rep(i, n) for(int i = 0; i < n; ++i) #define rep1(i, n) for(int i = 1; i <= n; ++i) #define rev(i, s, e) for(int i = s; i >= e; --i) #define trav(i, a) for(auto &i : a) template<typename T> void amin(T &a, T b) { a = min(a, b); } template<typename T> void amax(T &a, T b) { a = max(a, b); } #ifdef LOCAL #include "debug.h" #else #define debug(x) 42 #endif /* */ const int MOD = 1e9 + 7; const int N = 1e5 + 5; const int inf1 = int(1e9) + 5; const ll inf2 = ll(1e18) + 5; void solve(int test_case) { int n; cin >> n; vector<int> a(n+5); rep1(i,n) cin >> a[i]; vector<ll> pref(n+5); rep1(i,n) pref[i] = pref[i-1]+a[i]; map<ll,int> mp; vector<int> lx(n+5,-1); rep1(i,n){ mp[pref[i-1]] = i-1; ll p = pref[i]; if(mp.count(p)){ lx[i] = mp[p]+1; } } vector<int> start(n+5,inf1); rep1(i,n){ if(lx[i] != -1){ amin(start[lx[i]],i); } } rev(i,n,1) amin(start[i],start[i+1]); int LOG = 17; int up[n+5][LOG]; rep(j,LOG) up[n+1][j] = n+1; rep1(i,n) up[i][0] = n+1; rep1(i,n){ if(lx[i] == -1) conts; if(start[i+1] <= n){ up[i][0] = start[i+1]; } } rep1(j,LOG-1){ rep1(i,n){ up[i][j] = up[up[i][j-1]][j-1]; } } int q; cin >> q; while(q--){ int l,r; cin >> l >> r; int s = start[l]; int ans = 0; if(s <= r){ int u = s; ans = 1; rev(j,LOG-1,0){ if(up[u][j] <= r){ u = up[u][j]; ans += 1<<j; } } } cout << ans << endl; } } int main() { fastio; int t = 1; // cin >> t; rep1(i, t) { solve(i); } return 0; }
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