Submission #997234

#TimeUsernameProblemLanguageResultExecution timeMemory
997234peraTwo Antennas (JOI19_antennas)C++17
0 / 100
251 ms42832 KiB
#include<bits/stdc++.h> using namespace std; const int N = 2e5 + 10; int n , q; vector<int> L(N) , R(N) , A(N) , B(N) , H(N) , ans(N); vector<vector<int>> queries(N) , turn_on(N) , turn_off(N); struct node{ int mn_in = 1e9 + 1 , mx_in = -1 , mn_out = 1e9 + 1 , mx_out = -1 , ans = -1; }; vector<node> t(4 * N); void upd_ans(int u){ t[u].ans = max({t[u].ans , t[u].mx_out - t[u].mn_in , t[u].mx_in - t[u].mn_out}); } void push(int u){ if(t[u].mx_out < 0){ return; } t[u * 2].mn_out = min(t[u * 2].mn_out , t[u].mn_out); t[u * 2 + 1].mn_out = min(t[u * 2 + 1].mn_out , t[u].mn_out); t[u * 2].mx_out = max(t[u * 2].mx_out , t[u].mx_out); t[u * 2 + 1].mx_out = max(t[u * 2 + 1].mx_out , t[u].mx_out); upd_ans(u * 2); upd_ans(u * 2 + 1); t[u].mn_out = 1e9 + 1; t[u].mx_out = -1; } void update(int u , int l , int r , int pos , int x){ if(l == r){ if(x != -1){ t[u].mn_in = t[u].mx_in = x; }else{ t[u].mn_in = 1e9 + 1 , t[u].mx_in = -1; } return; } push(u); int m = (l + r) / 2; if(pos <= m){ update(u * 2 , l , m , pos , x); }else{ update(u * 2 + 1 , m + 1 , r , pos , x); } t[u].mn_in = min(t[u * 2].mn_in , t[u * 2 + 1].mn_in); t[u].mx_in = max(t[u * 2].mx_in , t[u * 2 + 1].mx_in); } void UPD(int u , int l , int r , int L ,int R , int x){ if(l > r || r < L || l > R){ return; } if(L <= l && r <= R){ t[u].mn_out = t[u].mx_out = x; upd_ans(u); return; } push(u); int m = (l + r) / 2; UPD(u * 2 , l , m , L , R , x); UPD(u * 2 + 1 , m + 1 , r , L , R , x); t[u].ans = max(t[u * 2].ans , t[u * 2 + 1].ans); } int GET(int u , int l ,int r , int L , int R){ if(l > r || r < L || l > R){ return -1; } if(L <= l && r <= R){ return t[u].ans; } push(u); int m = (l + r) / 2; return max(GET(u * 2 , l , m , L , R) , GET(u * 2 + 1 , m + 1 , r , L , R)); } int main(){ cin >> n; for(int i = 1;i <= n;i ++){ cin >> H[i] >> A[i] >> B[i]; if(i + A[i] <= n){ turn_on[i + A[i]].push_back(i); if(i + B[i] + 1 <= n){ turn_off[i + B[i] + 1].push_back(i); } } } cin >> q; for(int i = 1;i <= q;i ++){ cin >> L[i] >> R[i]; queries[R[i]].push_back(i); } for(int i = 1;i <= n;i ++){ for(int x = 0;x < (int)turn_on[i].size();x ++){ update(1 , 1 , n , turn_on[i][x] , H[turn_on[i][x]]); } for(int x = 0;x < (int)turn_off[i].size();x ++){ update(1 , 1 , n , turn_off[i][x] , -1); } if(i - A[i] >= 1){ UPD(1 , 1 , n , max(1 , i - B[i]) , i - A[i] , H[i]); } for(int id : queries[i]){ ans[id] = GET(1 , 1 , n , L[id] , R[id]); } } for(int i = 1;i <= q;i ++){ cout << (ans[i] <= 0 ? -1 : ans[i]) << '\n'; } }
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