p1_kadane_algo.cpp
· 1.2 KiB · C++
Raw
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define mod 1000000007
#define INF 1e18
#define nl "\n"
#define pb push_back
#define eb emplace_back
/*Note: emplace_back is faster than push_back*/
#define ppb pop_back
#define mp make_pair
#define ff first
#define ss second
#define PI 3.141592653589793238462
#define set_bits __builtin_popcountll
#define sz(x) ((int)(x).size())
#define all(x) (x).begin(), (x).end()
long long maxSubarraySum(vector<int> &nums)
{
int n = nums.size();
long long mx = LONG_MIN; // maximum sum
long long sum = 0;
for (int i = 0; i < n; i++)
{
sum += nums[i];
if (sum > mx)
{
mx = sum;
}
if (sum < 0)
{
sum = 0;
}
}
return mx;
}
void solve()
{
}
int main()
{
// ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
#ifndef ONLINE_JUDGE
// freopen("input.txt", "r", stdin);
// freopen("output.txt", "w", stdout);
#endif
ll t = 1;
cin >> t;
while (t--)
{
int n;
cin >> n;
vector<int> a(n);
for (int i = 0; i < n; i++)
cin >> a[i];
cout << maxSubarraySum(a) << nl;
}
}
| 1 | #include <bits/stdc++.h> |
| 2 | using namespace std; |
| 3 | #define ll long long |
| 4 | #define mod 1000000007 |
| 5 | #define INF 1e18 |
| 6 | #define nl "\n" |
| 7 | #define pb push_back |
| 8 | #define eb emplace_back |
| 9 | /*Note: emplace_back is faster than push_back*/ |
| 10 | #define ppb pop_back |
| 11 | #define mp make_pair |
| 12 | #define ff first |
| 13 | #define ss second |
| 14 | #define PI 3.141592653589793238462 |
| 15 | #define set_bits __builtin_popcountll |
| 16 | #define sz(x) ((int)(x).size()) |
| 17 | #define all(x) (x).begin(), (x).end() |
| 18 | |
| 19 | long long maxSubarraySum(vector<int> &nums) |
| 20 | { |
| 21 | int n = nums.size(); |
| 22 | long long mx = LONG_MIN; // maximum sum |
| 23 | long long sum = 0; |
| 24 | |
| 25 | for (int i = 0; i < n; i++) |
| 26 | { |
| 27 | |
| 28 | sum += nums[i]; |
| 29 | |
| 30 | if (sum > mx) |
| 31 | { |
| 32 | mx = sum; |
| 33 | } |
| 34 | |
| 35 | if (sum < 0) |
| 36 | { |
| 37 | sum = 0; |
| 38 | } |
| 39 | } |
| 40 | |
| 41 | return mx; |
| 42 | } |
| 43 | void solve() |
| 44 | { |
| 45 | } |
| 46 | int main() |
| 47 | { |
| 48 | // ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL); |
| 49 | #ifndef ONLINE_JUDGE |
| 50 | // freopen("input.txt", "r", stdin); |
| 51 | // freopen("output.txt", "w", stdout); |
| 52 | #endif |
| 53 | |
| 54 | ll t = 1; |
| 55 | cin >> t; |
| 56 | while (t--) |
| 57 | { |
| 58 | int n; |
| 59 | cin >> n; |
| 60 | vector<int> a(n); |
| 61 | for (int i = 0; i < n; i++) |
| 62 | cin >> a[i]; |
| 63 | cout << maxSubarraySum(a) << nl; |
| 64 | } |
| 65 | } |
p2_two_sum.cpp
· 1.3 KiB · C++
Raw
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define mod 1000000007
#define INF 1e18
#define nl "\n"
#define pb push_back
#define eb emplace_back
/*Note: emplace_back is faster than push_back*/
#define ppb pop_back
#define mp make_pair
#define ff first
#define ss second
#define PI 3.141592653589793238462
#define set_bits __builtin_popcountll
#define sz(x) ((int)(x).size())
#define all(x) (x).begin(), (x).end()
bool sumUp(unordered_map<int, int> &mp, int k, vector<int> &nums)
{
int n = nums.size();
for (int i = 0; i < n; i++)
{
int left = k - nums[i];
if (mp[left] > 0) // 1 pair summing up to k found
return true;
}
return false;
}
int main()
{
// ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
#ifndef ONLINE_JUDGE
// freopen("input.txt", "r", stdin);
// freopen("output.txt", "w", stdout);
#endif
ll t = 1;
cin >> t;
while (t--)
{
int n, k; // n-->total number of elements, k-->sum of two numbers
cin >> n >> k;
vector<int> a(n);
unordered_map<int, int> mp; // stores the frequency of all the elements
for (int i = 0; i < n; i++)
{
cin >> a[i];
mp[a[i]]++;
}
if (sumUp(mp, k, a))
cout << "YES" << nl;
else
cout << "NO" << nl;
}
}
| 1 | #include <bits/stdc++.h> |
| 2 | using namespace std; |
| 3 | #define ll long long |
| 4 | #define mod 1000000007 |
| 5 | #define INF 1e18 |
| 6 | #define nl "\n" |
| 7 | #define pb push_back |
| 8 | #define eb emplace_back |
| 9 | /*Note: emplace_back is faster than push_back*/ |
| 10 | #define ppb pop_back |
| 11 | #define mp make_pair |
| 12 | #define ff first |
| 13 | #define ss second |
| 14 | #define PI 3.141592653589793238462 |
| 15 | #define set_bits __builtin_popcountll |
| 16 | #define sz(x) ((int)(x).size()) |
| 17 | #define all(x) (x).begin(), (x).end() |
| 18 | bool sumUp(unordered_map<int, int> &mp, int k, vector<int> &nums) |
| 19 | { |
| 20 | int n = nums.size(); |
| 21 | |
| 22 | for (int i = 0; i < n; i++) |
| 23 | { |
| 24 | int left = k - nums[i]; |
| 25 | if (mp[left] > 0) // 1 pair summing up to k found |
| 26 | return true; |
| 27 | } |
| 28 | return false; |
| 29 | } |
| 30 | int main() |
| 31 | { |
| 32 | // ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL); |
| 33 | #ifndef ONLINE_JUDGE |
| 34 | // freopen("input.txt", "r", stdin); |
| 35 | // freopen("output.txt", "w", stdout); |
| 36 | #endif |
| 37 | |
| 38 | ll t = 1; |
| 39 | cin >> t; |
| 40 | while (t--) |
| 41 | { |
| 42 | int n, k; // n-->total number of elements, k-->sum of two numbers |
| 43 | cin >> n >> k; |
| 44 | vector<int> a(n); |
| 45 | unordered_map<int, int> mp; // stores the frequency of all the elements |
| 46 | for (int i = 0; i < n; i++) |
| 47 | { |
| 48 | cin >> a[i]; |
| 49 | mp[a[i]]++; |
| 50 | } |
| 51 | if (sumUp(mp, k, a)) |
| 52 | cout << "YES" << nl; |
| 53 | else |
| 54 | cout << "NO" << nl; |
| 55 | } |
| 56 | } |