Submission #525153

#	Time	Username	Problem	Language	Result	Execution time	Memory
525153		dron_rp	Trampoline (info1cup20_trampoline)	C++14	0 / 100	2094 ms	73168 KiB

trampoline

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

int r, c, n;

set<pair<int, int>> green;

bool bfs(int x, int y, int xf, int yf){
    queue<pair<int, int>> q;
    q.push({x, y});
    vector<vector<bool>> visited(10000, vector<bool>(10000, false));
    visited[x][y] = true;
    while (!q.empty()){
        pair<int, int> t = q.front();
        q.pop();
        int i, j;
        tie(i, j) = t;
        if (i == xf && j == yf) return true;
        if (j+1 <= c) q.push({i, j+1});
        if (green.count({i, j})){
            if (i+1 <= r) q.push({i+1, j});
        }
    }
    return false;
}
/*
bool dfs(int x, int y, int xf, int yf){
    //cout << x << " " << y << "\n";
    if (x == xf && y == yf){
        return true;
    }
    if (x == r && y == c) return false;
    bool canReach = false;
    if (y+1 <= c) canReach |= dfs(x, y+1, xf, yf);
    if (green.find({x, y}) != green.end()){
        if (x+1 <= r) canReach |= dfs(x+1, y, xf, yf);
    } 
    return canReach;
}
*/

int main(){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    cin >> r >> c >> n;
    int x, y;
    for (int i = 0; i<n; i++){
        cin >> x >> y;
        green.insert({x, y});
    }
    int t, xStart, yStart, xEnd, yEnd;
    cin >> t;
    while (t--){
        cin >> xStart >> yStart >> xEnd >> yEnd;
        cout << ((bfs(xStart, yStart, xEnd, yEnd)) ? "Yes\n" : "No\n");
    }
}

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