Submission #1183155

#TimeUsernameProblemLanguageResultExecution timeMemory
1183155HasanV11010238Sum Zero (RMI20_sumzero)C++20
61 / 100
971 ms24972 KiB
#include <bits/stdc++.h> #define ll long long #define INF 10000000 using namespace std; #define LOG 7 #define MAX 400002 int main(){ int n, q, l, r, la; ll pr = 0, a; cin>>n; la = n + 1; vector<int> de(n + 2, 0); map<ll, int> ma; ma[0] = 0; for (int i = 1; i <= n; i++){ cin>>a; pr += a; if (ma.find(pr) != ma.end()){ if (la == n + 1) la = ma[pr]; la = max(la, ma[pr]); } de[i] = la; ma[pr] = i; } ma.clear(); int up[n + 2][LOG]; for (int i = 0; i < LOG; i++) up[0][i] = 0, up[n + 1][i] = n + 1; for (int i = 1; i <= n; i++){ up[i][0] = de[i]; de[i] = de[up[i][0]] + 1; } for (int i = 1; i < LOG; i++){ for (int j = 1; j <= n; j++){ up[j][i] = j; for (int k = 0; k < 8; k++){ up[j][i] = up[up[j][i]][i - 1]; } } } cin>>q; while (q--){ cin>>l>>r; int st = r; l--; for (int i = 19; i >= 0; i--){ int jmp = r; int rep = (1<<(i % 3)); for (int j = 0; j < rep; j++) jmp = up[jmp][i/3]; if (jmp >= l && jmp != n + 1){ r = jmp; } } cout<<de[st] - de[r]<<"\n"; } }
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