Submission #1109907

#	Time	Username	Problem	Language	Result	Execution time	Memory
1109907		Zero_OP	Trampoline (info1cup20_trampoline)	C++14	100 / 100	217 ms	29832 KiB

trampoline

#include <bits/stdc++.h>

using namespace std;

#define rep(i, l, r) for(int i = (l), _r = (r); i < _r; ++i)
#define FOR(i, l, r) for(int i = (l), _r = (r); i <= _r; ++i)
#define ROF(i, r, l) for(int i = (r), _l = (l); i >= _l; --i)
#define all(v) begin(v), end(v)
#define compact(v) v.erase(unique(all(v)), end(v))
#define sz(v) (int)v.size()
#define dbg(x) "[" #x " = " << (x) << "]"

template<typename T>
bool minimize(T& a, const T& b){
    if(a > b) return a = b, true; return false;
}

template<typename T>
bool maximize(T& a, const T& b){
    if(a < b) return a = b, true; return false;
}

using ll = long long;
using ld = long double;

mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
template<typename T> T random_int(T l, T r){ return uniform_int_distribution<T>(l, r)(rng); }
template<typename T> T random_real(T l, T r){ return uniform_real_distribution<T>(l, r)(rng); }


int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);

#ifdef LOCAL
    freopen("task.inp", "r", stdin);
    freopen("task.out", "w", stdout);
#endif // LOCAL

    int R, C, N;
    cin >> R >> C >> N;

    int sizeBoard = max(R, C);

    vector<pair<int, int>> cells;

    auto encode = [&](int r, int c) -> long long{
        return 1LL * r * sizeBoard + c;
    };

    auto decode = [&](long long code){
        return make_pair(code / sizeBoard, code % sizeBoard);
    };

    vector<long long> codes;
    for(int i = 0; i < N; ++i){
        int x, y;
        cin >> x >> y;
        --x, --y;
        codes.emplace_back(encode(x, y));
    }

    sort(all(codes));
    compact(codes);
    codes.emplace_back((long long)2e18);

    N = (int)codes.size();
    int L = 32 - __builtin_clz(N);
    vector<vector<int>> up(L, vector<int>(N, N - 1));

    for(int i = 0; i < N - 1; ++i){
        int r, c;
        tie(r, c) = decode(codes[i]);
        long long next_code = encode(r + 1, c);

        int pos = lower_bound(all(codes), next_code) - codes.begin();
        if(pos >= N - 1) continue;

        int nr, nc;
        tie(nr, nc) = decode(codes[pos]);
        if(r == nr - 1 && c <= nc) {
            up[0][i] = pos;
        }
    }

    for(int i = 1; (1 << i) <= N; ++i){
        for(int j = 0; j < N; ++j){
            up[i][j] = up[i - 1][up[i - 1][j]];
        }
    }

    int Q;
    cin >> Q;
    while(Q--){
        int x1, y1, x2, y2;
        cin >> x1 >> y1 >> x2 >> y2;

        --x1, --y1, --x2, --y2;

        if(x1 > x2 || y1 > y2 || (x2 - x1 - 1 > N)){
            cout << "No\n";
            continue;
        }

        if(x1 == x2){
            cout << "Yes\n";
            continue;
        }

        int pos = lower_bound(all(codes), encode(x1, y1)) - codes.begin();
        if(pos == N - 1){
            cout << "No\n";
            continue;
        }

        int r, c;
        tie(r, c) = decode(codes[pos]);

        if(r != x1){
            cout << "No\n";
            continue;
        }

        int k = x2 - x1 - 1;
        for(int i = 0; i < L; ++i){
            if(k >> i & 1){
                pos = up[i][pos];
            }
        }

        if(pos == N - 1){
            cout << "No\n";
            continue;
        }

        tie(r, c) = decode(codes[pos]);
        if(r != x2 - 1 || c > y2){
            cout << "No\n";
        }  else{
            cout << "Yes\n";
        }
    }

    return 0;
}

Compilation message (stderr)

trampoline.cpp: In function 'bool minimize(T&, const T&)':
trampoline.cpp:15:5: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
   15 |     if(a > b) return a = b, true; return false;
      |     ^~
trampoline.cpp:15:35: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
   15 |     if(a > b) return a = b, true; return false;
      |                                   ^~~~~~
trampoline.cpp: In function 'bool maximize(T&, const T&)':
trampoline.cpp:20:5: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
   20 |     if(a < b) return a = b, true; return false;
      |     ^~
trampoline.cpp:20:35: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
   20 |     if(a < b) return a = b, true; return false;
      |                                   ^~~~~~

• Subtask 1: 23 / 23
• Subtask 2: 20 / 20
• Subtask 3: 11 / 11
• Subtask 4: 19 / 19
• Subtask 5: 27 / 27