bool canJump(int jumpPowers[], int n)
{
vector<bool> canReachEnd(n, false);
canReachEnd[n-1] = true;
int p = n - 1;
while (true) {
if (canReachEnd[0]) {
return true;
}
if (p == 0) {
return false;
}
for (int i = 0; i < p; ++i) {
if (canReachEnd[i]) {
continue;
}
if (jumpPowers[i] + i >= p) {
canReachEnd[i] = true;
}
}
while (p > 0) {
if (canReachEnd[--p]) {
break;
}
}
}
}
bool CanReachEnd::test() {
int temp_arr1[] = { 3, 3, 1, 0, 2, 0, 1 };
vector<int> a ( temp_arr1, temp_arr1 + sizeof(temp_arr1) / sizeof(temp_arr1[0]) );
int temp_arr2[] = { 3, 2, 0, 0, 2, 0, 1 };
vector<int> b ( temp_arr2, temp_arr2 + sizeof(temp_arr2) / sizeof(temp_arr2[0]) );
cout << "In " << vec_to_string(a) << ", can ";
if (!canReachEnd(a))
cout << "not ";
cout << "reach the end. " << endl;
cout << "In " << vec_to_string(b) << ", can ";
if (!canReachEnd(b))
cout << "not ";
cout << "reach the end. " << endl;
return true;
}
