Submission #475194

#	Time	Username	Problem	Language	Result	Execution time	Memory
475194		bigo	Trampoline (info1cup20_trampoline)	C++14	Compilation error	0 ms	0 KiB

trampoline

#include <bits/stdc++.h>
#include <cmath>
typedef pair<int, int> pii;
using namespace std;
vector<vector<int>>vec;
vector<bool>visit;
void dfs(int v) {
	visit[v] = true;
	for (int i = 0; i < vec[v].size(); i++) {
		if (!visit[vec[v][i]])
			dfs(vec[v][i]);
	}
}
int main() {
	int r, c, n;
	cin >> r >> c >> n;
	set<pii>green;
	int a, b;
	for (int i = 0; i < n; i++) {
		cin >> a >> b;
		a--, b--;
		green.insert({ a,b });
	}
	vec.resize(r * c);
	visit.resize(r * c, false);
	for (int i = 0; i < r; i++) {
		for (int j = 0; j < c; j++) {
			if (green.find({ i,j }) != green.end()) {
				if(i!=r-1)
					vec[i * c + j].push_back(i * c + j + 1);
				if(j!=c-1)
					vec[i * c + j].push_back((i + 1) * c + j);
			}
			else {
				if(j!=c-1)
					vec[i * c + j].push_back(i * c + j + 1);
			}
		}
	}
	int t;
	cin >> t;
	while (t--) {
		int y1, x1, y2, x2;
		cin >> y1 >> x1 >> y2 >> x2;
		y1--, x1--, y2--, x2--;
		dfs(y1 * c + x1);
		if (visit[y2 * c + x2])
			cout << "YES";
		else
			cout << "NO";
		cout << endl;
		for (int i = 0; i < r * c; i++)
			visit[i] = false;
	}
}

Compilation message (stderr)

trampoline.cpp:3:9: error: 'pair' does not name a type
    3 | typedef pair<int, int> pii;
      |         ^~~~
trampoline.cpp: In function 'void dfs(int)':
trampoline.cpp:9:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    9 |  for (int i = 0; i < vec[v].size(); i++) {
      |                  ~~^~~~~~~~~~~~~~~
trampoline.cpp: In function 'int main()':
trampoline.cpp:17:6: error: 'pii' was not declared in this scope
   17 |  set<pii>green;
      |      ^~~
trampoline.cpp:17:9: error: template argument 1 is invalid
   17 |  set<pii>green;
      |         ^
trampoline.cpp:17:9: error: template argument 2 is invalid
trampoline.cpp:17:9: error: template argument 3 is invalid
trampoline.cpp:22:9: error: request for member 'insert' in 'green', which is of non-class type 'int'
   22 |   green.insert({ a,b });
      |         ^~~~~~
trampoline.cpp:28:14: error: request for member 'find' in 'green', which is of non-class type 'int'
   28 |    if (green.find({ i,j }) != green.end()) {
      |              ^~~~
trampoline.cpp:28:37: error: request for member 'end' in 'green', which is of non-class type 'int'
   28 |    if (green.find({ i,j }) != green.end()) {
      |                                     ^~~