Tutorial
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Solution (Vovuh)
#include <bits/stdc++.h>
using namespace std;
int main() {
#ifdef _DEBUG
freopen("input.txt", "r", stdin);
// freopen("output.txt", "w", stdout);
#endif
int n;
cin >> n;
for (int i = 0; i < n; ++i) {
int x;
cin >> x;
cout << x - !(x & 1) << " ";
}
return 0;
}
Tutorial
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Solution (Vovuh)
#include <bits/stdc++.h>
using namespace std;
int main() {
#ifdef _DEBUG
freopen("input.txt", "r", stdin);
// freopen("output.txt", "w", stdout);
#endif
int n, k;
cin >> n >> k;
vector<pair<int, int>> res(n);
vector<int> a(n);
for (int i = 0; i < n; ++i) {
cin >> res[i].first;
a[i] = res[i].first;
res[i].second = i + 1;
}
sort(res.begin(), res.end());
reverse(res.begin(), res.end());
sort(res.begin(), res.begin() + k, [&](pair<int, int> a, pair<int, int> b) { return a.second < b.second; });
int lst = 0, sum = 0;
for (int i = 0; i < k - 1; ++i) {
sum += *max_element(a.begin() + lst, a.begin() + res[i].second);
lst = res[i].second;
}
sum += *max_element(a.begin() + lst, a.end());
cout << sum << endl;
lst = 0;
for (int i = 0; i < k - 1; ++i) {
cout << res[i].second - lst << " ";
lst = res[i].second;
}
cout << n - lst << endl;
return 0;
}
1006C - Three Parts of the Array
Tutorial
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Solution (Vovuh, set)
#include <bits/stdc++.h>
using namespace std;
int main() {
#ifdef _DEBUG
freopen("input.txt", "r", stdin);
// freopen("output.txt", "w", stdout);
#endif
int n;
cin >> n;
vector<int> a(n);
for (int i = 0; i < n; ++i)
cin >> a[i];
set<long long> sum;
long long l = 0;
for (int i = 0; i < n; ++i) {
l += a[i];
sum.insert(l);
}
long long ans = 0;
long long r = 0;
for (int i = n - 1; i >= 0; --i) {
sum.erase(l);
l -= a[i];
r += a[i];
if (sum.count(r))
ans = max(ans, r);
}
cout << ans << endl;
return 0;
}
Solution (ivan100sic, two pointers)
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
int n;
int a[200005];
int main() {
ios_base::sync_with_stdio(false);
cin.tie(nullptr);
cout.tie(nullptr);
cerr.tie(nullptr);
cin >> n;
for (int i=1; i<=n; i++)
cin >> a[i];
int i = 0, j = n+1;
ll zi = 0, zj = 0, solidx = 0;
while (i < j) {
if (zi < zj)
zi += a[++i];
else if (zi > zj)
zj += a[--j];
else {
solidx = i;
zi += a[++i];
zj += a[--j];
}
}
cout << accumulate(a+1, a+solidx+1, 0ll); // here
}
Tutorial
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Solution (Ne0n25)
#include <bits/stdc++.h>
using namespace std;
#define x first
#define y second
#define mp make_pair
#define pb push_back
#define sqr(a) ((a) * (a))
#define sz(a) int(a.size())
#define all(a) a.begin(), a.end()
#define forn(i, n) for(int i = 0; i < int(n); i++)
#define fore(i, l, r) for(int i = int(l); i < int(r); i++)
typedef long long li;
typedef long double ld;
typedef pair<int, int> pt;
template <class A, class B> ostream& operator << (ostream& out, const pair<A, B> &a) {
return out << "(" << a.x << ", " << a.y << ")";
}
template <class A> ostream& operator << (ostream& out, const vector<A> &v) {
out << "[";
forn(i, sz(v)) {
if(i) out << ", ";
out << v[i];
}
return out << "]";
}
mt19937 rnd(time(NULL));
const int INF = int(1e9);
const li INF64 = li(1e18);
const int MOD = INF + 7;
const ld EPS = 1e-9;
const ld PI = acos(-1.0);
int n;
string s, t;
bool read() {
if (!(cin >> n >> s >> t))
return false;
return true;
}
void solve() {
int ans = 0;
forn(i, n / 2) {
map<char, int> a;
a[s[i]]++; a[s[n - i - 1]]++;
a[t[i]]++; a[t[n - i - 1]]++;
if (sz(a) == 4)
ans += 2;
else if (sz(a) == 3)
ans += 1 + (s[i] == s[n - i - 1]);
else if (sz(a) == 2)
ans += a[s[i]] != 2;
}
if (n % 2 == 1 && s[n / 2] != t[n / 2])
ans++;
cout << ans << endl;
}
int main() {
#ifdef _DEBUG
freopen("input.txt", "r", stdin);
// freopen("output.txt", "w", stdout);
int tt = clock();
#endif
cerr.precision(15);
cout.precision(15);
cerr << fixed;
cout << fixed;
#ifdef _DEBUG
while (read()) {
#else
if (read()) {
#endif
solve();
#ifdef _DEBUG
cerr << "TIME = " << clock() - tt << endl;
tt = clock();
#endif
}
}
Tutorial
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Solution (mareksom)
#include <bits/stdc++.h>
using namespace std;
int n, q;
vector<vector<int>> tree;
int current_preorder;
vector<int> preorder, max_preorder;
vector<int> sorted_by_preorder;
void Dfs(int w) {
sorted_by_preorder[current_preorder] = w;
preorder[w] = current_preorder++;
for (int c : tree[w]) {
Dfs(c);
}
max_preorder[w] = current_preorder - 1;
}
int main() {
ios_base::sync_with_stdio(0);
cin.tie(0);
cin >> n >> q;
assert(2 <= n);
assert(1 <= q);
tree.resize(n);
for (int i = 1; i < n; i++) {
int p;
cin >> p;
p--;
assert(0 <= p and p < n);
tree[p].push_back(i);
}
preorder.resize(n);
max_preorder.resize(n);
sorted_by_preorder.resize(n);
current_preorder = 0;
Dfs(0);
for (int i = 0; i < q; i++) {
int u, k;
cin >> u >> k;
u--; k--;
assert(0 <= u and u < n);
assert(0 <= k and k < n);
k += preorder[u];
int answer = -1;
if (k <= max_preorder[u]) {
answer = sorted_by_preorder[k] + 1;
assert(1 <= answer and answer <= n);
}
cout << answer << '\n';
}
return 0;
}
Tutorial
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Solution (Vovuh)
#include <bits/stdc++.h>
using namespace std;
const int N = 20;
map<long long, int> v[N][N];
int n, m;
int half;
long long k;
long long a[N][N];
long long ans;
void calclf(int x, int y, long long val, int cnt) {
val ^= a[x][y];
if (cnt == half) {
++v[x][y][val];
return;
}
if (x + 1 < n)
calclf(x + 1, y, val, cnt + 1);
if (y + 1 < m)
calclf(x, y + 1, val, cnt + 1);
}
void calcrg(int x, int y, long long val, int cnt) {
if (cnt == n + m - 2 - half) {
if (v[x][y].count(k ^ val))
ans += v[x][y][k ^ val];
return;
}
if (x > 0)
calcrg(x - 1, y, val ^ a[x][y], cnt + 1);
if (y > 0)
calcrg(x, y - 1, val ^ a[x][y], cnt + 1);
}
int main() {
#ifdef _DEBUG
freopen("input.txt", "r", stdin);
// freopen("output.txt", "w", stdout);
#endif
cin >> n >> m >> k;
half = (n + m - 2) / 2;
for (int i = 0; i < n; ++i) {
for (int j = 0; j < m; ++j) {
cin >> a[i][j];
}
}
calclf(0, 0, 0, 0);
calcrg(n - 1, m - 1, 0, 0);
cout << ans << endl;
return 0;
}