Submission #1145108

#	Time	Username	Problem	Language	Result	Execution time	Memory
1145108		Robert_junior	Trampoline (info1cup20_trampoline)	C++17	73 / 100	2077 ms	61440 KiB

trampoline

#include <bits/stdc++.h>
using namespace std;
#define ins insert
#define pb push_back
#define all(x) x.begin(), x.end()
#define F first
#define S second
const int N = 2e5 + 7;
int x[N], y[N], to1[N];
map<int, set<int>>mp;
pair<int, int>to[N];
int up[N][17];
map<pair<int, int>, int>mp1;
int c, d;
pair<int, int>next(int a, int b){
    if(mp[a + 1].size()){
        auto it = mp[a + 1].lower_bound(b);
        if(it != mp[a + 1].end()){
            return {a + 1, *it};
        }
        else{
            return {-1, -1};
        }
    }
    else{
        return {-1, -1};
    }
}
int check(int i, int m){
    for(int j = 0; j < 17; j++){
        if((m>>j) & 1) i = up[i][j];
    }
    if(i == 0) return 2;
    if(x[i] >= c) return 2;
    if(x[i] < c - 1) return 0;
    if(x[i] == c - 1) return 1;
}
void solve(){
    int r, w, n, t;
    cin>>r>>w>>n;
    vector<array<int, 3>>v;
    for(int i = 1; i <= n; i++){
        cin>>x[i]>>y[i]; 
        mp1[{x[i], y[i]}] = i;
        mp[x[i]].ins(y[i]);
        v.pb({x[i], y[i], i});
    }
    for(int i = 1; i <= n; i++){
        to[i] = next(x[i], y[i]);
        if(to[i].F == -1 && to[i].S == -1){
            auto it = mp[x[i]].upper_bound(y[i]);
            if(it != mp[x[i]].end()){
                to[i] = {x[i], *it};
            }
        }
        if(to[i].F != -1 && to[i].S != -1){
            to1[i] = mp1[to[i]];
        }
    }
    sort(all(v));
    reverse(all(v));
    for(auto [a, b, i] : v){
        up[i][0] = to1[i];
        for(int j = 1; j < 17; j++){
            up[i][j] = up[up[i][j - 1]][j - 1];
        }
    }
    cin>>t;
    while(t--){
        int a, b;
        cin>>a>>b>>c>>d;
        if(a == c && b <= d){
            cout<<"YES\n";
            continue;
        }
        if(!mp[a].size() || a > c || b > d){
            cout<<"NO\n";
            continue;
        }
        auto it = mp[a].lower_bound(b);
        if(it != mp[a].end()){
            b = *it;
        }
        int i = mp1[{a, b}];
        int l = 0, r = 2e5 + 7, res = -1;
        while(l <= r){
            int m = (l + r) / 2;
            int f = check(i, m);
            if(f == 1){
                r = m - 1;
                res = m;
            }
            else if(f == 2){
                r = m - 1;
            }
            else{
                l = m + 1;
            }
        }
        if(res == -1){
            cout<<"NO\n";
            continue;
        }
        for(int j = 0; j < 17; j++){
            if((res>>j) & 1){
                i = up[i][j];
            }
        }
        if(x[i] == c - 1 && y[i] <= d){
            cout<<"YES\n";
        }
        else{
            cout<<"NO\n";
        }
    }
}
signed main(){
    ios_base :: sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);
    int t = 1;
    //cin>>t;
    while(t--){
        solve();
    }
}

Compilation message (stderr)

trampoline.cpp: In function 'int check(int, int)':
trampoline.cpp:37:1: warning: control reaches end of non-void function [-Wreturn-type]
   37 | }
      | ^

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