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Add a lot more problems and a TODO list

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Segcolt
2025-10-18 16:54:05 -03:00
parent f82c3630cf
commit f3275cd442
72 changed files with 9550 additions and 17 deletions
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157
Codeforces Global Round 29 (Div. 1 + Div. 2)/C. Rabbits.cpp Normal file
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/* Problem URL: https://codeforces.com/contest/2147/problem/C */
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace std;
using namespace __gnu_pbds;
template <class T, class comp = less<>>
using ordered_set = tree<T, null_type , comp , rb_tree_tag , tree_order_statistics_node_update>;
#define V vector
#define rmin(a, b) a = min(a, b)
#define rmax(a, b) a = max(a, b)
#define rep(i, lim) for (int i = 0; i < (lim); i++)
#define nrep(i, s, lim) for (int i = s; i < (lim); i++)
#define repv(i, v) for (auto &i : (v))
#define fillv(v) for (auto &itr_ : (v)) { cin >> itr_; }
#define sortv(v) sort(v.begin(), v.end())
#define all(v) (v).begin(), (v).end()
using vi = vector<int>;
using vvi = vector<vi>;
using vvvi = vector<vvi>;
using vvvvi = vector<vvvi>;
using ll = long long;
using vl = vector<ll>;
using vvl = vector<vl>;
using vvvl = vector<vvl>;
using vvvvl = vector<vvvl>;
template<class v>
auto operator<<(ostream &os, const vector<v> &vec)->ostream& {
os << vec[0];
for (size_t i = 1; i < vec.size(); i++) {
os << ' ' << vec[i];
}
os << '\n';
return os;
}
template<class v>
auto operator>>(istream &is, vector<v> &vec)->istream& {
for (auto &i : vec) {
is >> i;
}
return is;
}
template<class v>
auto operator<<(ostream &os, const vector<vector<v>> &vec)->ostream& {
for (auto &i : vec) {
os << i[0];
for (size_t j = 1; j < i.size(); j++) {
os << ' ' << i[j];
}
os << '\n';
}
return os;
}
template<class v>
auto operator>>(istream &is, vector<vector<v>> &vec)->istream& {
for (auto &i : vec) {
for (auto &j : i) {
is >> j;
}
}
return is;
}
int main()
{
ios::sync_with_stdio(false);
cin.tie(nullptr);
int t;
cin >> t;
while (t--) {
int n;
string tmp;
cin >> n >> tmp;
repv(i, tmp) {
i -= '0';
}
int prev = tmp[0];
int cur;
for (cur = 0; cur < n; cur++) {
if (prev == 0 && tmp[cur] == 0) {
continue;
}
if (prev == 0 && tmp[cur] == 1) {
prev = 1;
continue;
}
if (prev == 1 && tmp[cur] == 0) {
prev = 0;
continue;
}
break;
}
if (cur == n) {
cout << "YES\n";
continue;
}
int c = 0;
bool pos = true;
bool exc = false;
for (; cur < n; cur++) {
if (prev == 0 && tmp[cur] == 0) {
exc = true;
continue;
}
if (prev == 0 && tmp[cur] == 1) {
prev = 1;
continue;
}
if (prev == 1 && tmp[cur] == 0) {
c++;
prev = 0;
continue;
}
if ((c & 1) && !exc) {
pos = false;
break;
}
prev = 1;
c = 0;
exc = false;
}
if (prev == 1 && (c & 1) && !exc) {
pos = false;
}
cout << (pos ? "YES\n" : "NO\n");
}
}

140
Codeforces Global Round 29 (Div. 1 + Div. 2)/D. Game on Array.cpp Normal file
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/* Problem URL: https://codeforces.com/contest/2147/problem/D */
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace std;
using namespace __gnu_pbds;
template <class T, class comp = less<>>
using ordered_set = tree<T, null_type , comp , rb_tree_tag , tree_order_statistics_node_update>;
#define V vector
#define rmin(a, b) a = min(a, b)
#define rmax(a, b) a = max(a, b)
#define rep(i, lim) for (int i = 0; i < (lim); i++)
#define nrep(i, s, lim) for (int i = s; i < (lim); i++)
#define repv(i, v) for (auto &i : (v))
#define fillv(v) for (auto &itr_ : (v)) { cin >> itr_; }
#define sortv(v) sort(v.begin(), v.end())
#define all(v) (v).begin(), (v).end()
using vi = vector<int>;
using vvi = vector<vi>;
using vvvi = vector<vvi>;
using vvvvi = vector<vvvi>;
using ll = long long;
using vl = vector<ll>;
using vvl = vector<vl>;
using vvvl = vector<vvl>;
using vvvvl = vector<vvvl>;
template<class v>
auto operator<<(ostream &os, const vector<v> &vec)->ostream& {
os << vec[0];
for (size_t i = 1; i < vec.size(); i++) {
os << ' ' << vec[i];
}
os << '\n';
return os;
}
template<class v>
auto operator>>(istream &is, vector<v> &vec)->istream& {
for (auto &i : vec) {
is >> i;
}
return is;
}
template<class v>
auto operator<<(ostream &os, const vector<vector<v>> &vec)->ostream& {
for (auto &i : vec) {
os << i[0];
for (size_t j = 1; j < i.size(); j++) {
os << ' ' << i[j];
}
os << '\n';
}
return os;
}
template<class v>
auto operator>>(istream &is, vector<vector<v>> &vec)->istream& {
for (auto &i : vec) {
for (auto &j : i) {
is >> j;
}
}
return is;
}
int main()
{
ios::sync_with_stdio(false);
cin.tie(nullptr);
int t;
cin >> t;
while (t--) {
int n;
cin >> n;
vl fds(n);
cin >> fds;
map<ll, ll> c;
map<ll, ll, greater<>> even;
repv(i, fds) {
if (i & 1) {
c[i]++;
if (i != 1) {
even[i - 1]++;
}
} else {
even[i]++;
}
}
vl freq;
freq.reserve(c.size());
repv(i, c) {
freq.push_back(i.second);
}
sort(all(freq), greater<>());
ll play[2] = {};
rep(i, freq.size()) {
play[i & 1] += freq[i];
}
auto itr = even.begin();
while (itr != even.end()) {
auto ne = next(itr);
ll pro = ne == even.end() ? 0 : ne->first;
ll diff = itr->first - pro;
play[0] += (diff >> 1) * itr->second;
play[1] += (diff >> 1) * itr->second;
if (ne != even.end()) {
ne->second += itr->second;
}
itr = ne;
}
cout << play[0] << ' ' << play[1] << '\n';
}
}