Submission #426892

#	Time	Username	Problem	Language	Result	Execution time	Memory
426892		lyc	Trampoline (info1cup20_trampoline)	C++14	11 / 100	858 ms	26552 KiB

trampoline

#include <bits/stdc++.h>
using namespace std;

#define TRACE(x) cerr << #x << " :: " << x << endl
#define _ << " " <<
#define SZ(x) (int)(x).size()
#define ALL(x) (x).begin(),(x).end()
#define FOR(i,a,b) for(int i=(a);i<=(b);++i)
#define RFOR(i,a,b) for(int i=(a);i>=(b);--i)
typedef pair<int,int> ii;

const int mxN = 2e5+5;
const int lgN = 18;

int R, C, N, T, A[mxN], B[mxN];
map<int,vector<ii>> rows;
int pa[mxN][lgN];

int main() {
    ios::sync_with_stdio(false); cin.tie(0); cout.tie(0);

    cin >> R >> C >> N;
    FOR(i,1,N){
        int a, b; cin >> a >> b; 
        A[i] = a, B[i] = b;
        rows[a].push_back(ii(b,i));
    }

    for (auto& [a, v] : rows) {
        sort(ALL(v));
        auto& p = rows[a-1];
        auto it = p.begin();
        for (auto& [b, i] : v) {
            while (it != p.end() && next(it) != p.end() && next(it)->first <= b) ++it;
            pa[i][0] = (it == p.end() ? 0 : it->second);
            FOR(k,1,lgN-1) pa[i][k] = pa[pa[i][k-1]][k-1];
        }
    }

    cin >> T;
    FOR(i,1,T){
        int a, b, c, d; cin >> a >> b >> c >> d;

        bool ok = 1;
        if (a > c || b > d) ok = 0;
        else if (a < c) {
            auto it = lower_bound(ALL(rows[c-1]), ii(d+1,0));
            if (it == rows[c-1].begin()) ok = 0;
            else {
                auto u = (--it)->second;
                RFOR(k,lgN-1,0) if (pa[u][k] && A[pa[u][k]] >= a) {
                    u = pa[u][k];
                }
                if (A[u] != a || B[u] < b) ok = 0;
            }
        }

        cout << (ok ? "Yes" : "No") << '\n';
    }
}

Compilation message (stderr)

trampoline.cpp: In function 'int main()':
trampoline.cpp:29:16: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   29 |     for (auto& [a, v] : rows) {
      |                ^
trampoline.cpp:33:20: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   33 |         for (auto& [b, i] : v) {
      |                    ^

• Subtask 1: 0 / 23
• Subtask 2: 0 / 20
• Subtask 3: 11 / 11
• Subtask 4: 0 / 19
• Subtask 5: 0 / 27