Submission #1022242

#	Time	Username	Problem	Language	Result	Execution time	Memory
1022242		MohamedFaresNebili	Rainforest Jumps (APIO21_jumps)	C++14	0 / 100	349 ms	78488 KiB

jumps

        #include <bits/stdc++.h>
                 
                using namespace std;
         
                int N;
                int P[200005];
                int MX[800005];
                vector<int> ST[800005];
                vector<int> adj[200005];
                int UP[200005][20], DN[200005][20];
                int R[200005];
                vector<int> H;
         
                void build(int v, int l, int r) {
                    if(l == r) {
                        ST[v].push_back(P[l]);
                        return;
                    }
                    build(v * 2, l, (l + r) / 2);
                    build(v * 2 + 1, (l + r) / 2 + 1, r);
                    
                    int i = 0, j = 0;
                    while(i < ST[v * 2].size() || j < ST[v * 2 + 1].size()) {
                        if(i == ST[v * 2].size())
                            ST[v].push_back(ST[v * 2 + 1][j++]);
                        else if(j == ST[v * 2 + 1].size())
                            ST[v].push_back(ST[v * 2][i++]);
                        else {
                            if(ST[v * 2][i] < ST[v * 2 + 1][j])
                                ST[v].push_back(ST[v * 2][i++]);
                            else ST[v].push_back(ST[v * 2 + 1][j++]);
                        }
                    }
                }
         
                void buildM(int v, int l, int r) {
                    if(l == r) {
                        MX[v] = H[l];
                        return;
                    }
                    buildM(v * 2, l, (l + r) / 2);
                    buildM(v * 2 + 1, (l + r) / 2 + 1, r);
                    MX[v] = max(MX[v * 2], MX[v * 2 + 1]);
                }
         
                int query(int v, int l, int r, int lo, int hi) {
                    if(l > hi || r < lo) return 0;
                    if(l >= lo && r <= hi) return MX[v];
                    return max(query(v * 2, l, (l + r) / 2, lo, hi),
                        query(v * 2 + 1, (l + r) / 2 + 1, r, lo, hi));
                }
         
                int queryR(int v, int l, int r, int lo, int hi, int K) {
                    if(l > hi || r < lo) return 1e9 + 7;
                    if(l >= lo && r <= hi) {
                        int R = lower_bound(ST[v].begin(), ST[v].end(), K) - ST[v].begin();
                        if(R == ST[v].size()) return 1e9 + 7;
                        return ST[v][R];
                    }
                    return min(queryR(v * 2, l, (l + r) / 2, lo, hi, K), 
                        queryR(v * 2 + 1, (l + r) / 2 + 1, r, lo, hi, K));
                }
         
                int queryL(int v, int l, int r, int lo, int hi, int K) {
                    if(l > hi || r < lo) return -1;
                    if(l >= lo && r <= hi) {
                        int L = lower_bound(ST[v].begin(), ST[v].end(), K) - ST[v].begin();
                        if(L == 0) return -1;
                        return ST[v][--L];
                    }
                    return max(queryL(v * 2, l, (l + r) / 2, lo, hi, K), 
                        queryL(v * 2 + 1, (l + r) / 2 + 1, r, lo, hi, K));
                }
         
                void init(int _N, vector<int> _H) {
                    N = _N;
                    for(int l = 0; l < _N; l++) {
                        H.push_back(_H[l]);
                        P[_H[l]] = l;
                    }
         
                    for(int l = 0; l < 20; l++)
                        UP[N + 1][l] = DN[N + 1][l] = N + 1;
                    R[N + 1] = N + 1;
                    
         
                    build(1, 1, N);
                    buildM(1, 0, N - 1);
         
                    for(int l = 0; l < _N; l++) {
                        int i = queryL(1, 1, N, _H[l] + 1, N, l);
                        int j = queryR(1, 1, N, _H[l] + 1, N, l);
         
                        DN[l][0] = (i != -1 ? i : N + 1);
                        UP[l][0] = (j != 1e9 + 7 ? j : N + 1);
                        R[l] = UP[l][0];
         
                        if(H[UP[l][0]] < H[DN[l][0]]) 
                            swap(UP[l][0], DN[l][0]);
         
                    }
         
                    for(int l = 1; l < 20; l++)
                        for(int i = 0; i < _N; i++) {
                            UP[i][l] = UP[UP[H[i]][l - 1]][l - 1];
                            DN[i][l] = DN[DN[H[i]][l - 1]][l - 1];
                        }
                }
         
                int solve(int U, int C, int D) {
                    int best = 0;
                    if(R[U] >= C) return 1;
         
                    for(int l = 19; l >= 0; l--)
                        if(R[UP[U][l]] < C) best += (1 << l), U = UP[U][l];
                    ++best; U = UP[U][0];
                    if(U >= C && U <= D) return best;
                    if(R[U] >= C && R[U] <= D) return ++best;
         
                    for(int l = 19; l >= 0; l--) 
                        if(R[DN[U][l]] < C) best += (1 << l), U = DN[U][l];
                    ++best; U = DN[U][0];
                    if(U >= C && U <= D) return best;
                    return ++best;
                }
         
                int minimum_jumps(int A, int B, int C, int D) {
                    int lo = A, hi = B, ans = -1;
                    int G = query(1, 0, N - 1, C, D);
                    while(lo <= hi) {
                        int md = (lo + hi) / 2;
                        int q = query(1, 0, N - 1, md, B);
                        if(q < G) ans = md, hi = md - 1;
                        else lo = md + 1;
                    }
                    if(ans == -1) return -1;
                    int U = P[query(1, 0, N - 1, ans, B)];
                    int res = solve(U, C, D);
                    return (res > N ? -1 : res);
                }

Compilation message (stderr)

jumps.cpp: In function 'void build(int, int, int)':
jumps.cpp:23:29: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   23 |                     while(i < ST[v * 2].size() || j < ST[v * 2 + 1].size()) {
      |                           ~~^~~~~~~~~~~~~~~~~~
jumps.cpp:23:53: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   23 |                     while(i < ST[v * 2].size() || j < ST[v * 2 + 1].size()) {
      |                                                   ~~^~~~~~~~~~~~~~~~~~~~~~
jumps.cpp:24:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   24 |                         if(i == ST[v * 2].size())
      |                            ~~^~~~~~~~~~~~~~~~~~~
jumps.cpp:26:35: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   26 |                         else if(j == ST[v * 2 + 1].size())
      |                                 ~~^~~~~~~~~~~~~~~~~~~~~~~
jumps.cpp: In function 'int queryR(int, int, int, int, int, int)':
jumps.cpp:57:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   57 |                         if(R == ST[v].size()) return 1e9 + 7;
      |                            ~~^~~~~~~~~~~~~~~

• Subtask 1: 0 / 4
• Subtask 2: 0 / 8
• Subtask 3: 0 / 13
• Subtask 4: 0 / 12
• Subtask 5: 0 / 23
• Subtask 6: 0 / 21
• Subtask 7: 0 / 19