Идея: fcspartakm
Разбор
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Решение (fcspartakm)
#include <bits/stdc++.h>
using namespace std;
int n;
inline void read() {
cin >> n;
}
inline void solve() {
for (int x = 1; x <= 20; x++) {
for (int y = 1; y <= 20; y++) {
if (x + y >= n || x == y) continue;
int z = n - x - y;
if (z == x || z == y) continue;
if (x % 3 == 0 || y % 3 == 0 || z % 3 == 0) {
continue;
}
puts("YES");
cout << x << ' ' << y << ' ' << z << endl;
return;
}
}
puts("NO");
}
int main () {
int t;
cin >> t;
while (t--){
read();
solve();
}
}
Идея: BledDest
Разбор
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Решение (Neon)
#include <bits/stdc++.h>
using namespace std;
int main() {
auto dist = [](int x1, int y1, int x2, int y2) {
return sqrt((x1 - x2) * (x1 - x2) + (y1 - y2) * (y1 - y2));
};
int t;
cin >> t;
while (t--) {
int px, py, ax, ay, bx, by;
cin >> px >> py >> ax >> ay >> bx >> by;
double pa = dist(px, py, ax, ay), pb = dist(px, py, bx, by);
double oa = dist(0, 0, ax, ay), ob = dist(0, 0, bx, by);
double ab = dist(ax, ay, bx, by);
double ans = 1e9;
ans = min(ans, max(pa, oa));
ans = min(ans, max(pb, ob));
ans = min(ans, max({ab / 2, pa, ob}));
ans = min(ans, max({ab / 2, pb, oa}));
cout << setprecision(10) << fixed << ans << '\n';
}
}
Идея: Roms
Разбор
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Решение (Roms)
#include <bits/stdc++.h>
using namespace std;
const int N = 200'000;
int t;
int main() {
cin >> t;
for (int tc = 0; tc < t; ++tc) {
string s;
long long pos;
cin >> s >> pos;
--pos;
int curLen = s.size();
vector <char> st;
bool ok = pos < curLen;
s += '$';
for (auto c : s) {
while (!ok && st.size() > 0 && st.back() > c) {
pos -= curLen;
--curLen;
st.pop_back();
if(pos < curLen)
ok = true;
}
st.push_back(c);
}
cout << st[pos];
}
return 0;
}
Идея: Roms
Разбор
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Решение (Roms)
#include <bits/stdc++.h>
using namespace std;
const int MOD = 998'244'353;
const int N = 300'009;
int bp(int a, int n) {
int res = 1;
while(n > 0) {
if (n & 1)
res = (res * 1LL * a) % MOD;
a = (a * 1LL * a) % MOD;
n >>= 1;
}
return res;
}
int n, m;
string s;
int inv[N];
void upd(int &res, int x) {
res = (res * 1LL * x) % MOD;
}
int main() {
inv[1] = 1;
for (int i = 2; i < N; ++i){
inv[i] = bp(i, MOD - 2);
}
cin >> n >> m >> s;
int res = 1, k = n;
bool isZero = false;
for (int i = 0; i < s.size(); ++i)
if (s[i] == '?') {
if (i == 0) {
isZero = true;
} else {
upd(res, i);
}
}
cout << (isZero? 0 : res) << endl;
for(int i = 0; i < m; ++i) {
int pos;
char c;
cin >> pos >> c;
--pos;
if (s[pos] == '?' && (c == '<' || c == '>')) {
if (pos == 0)
isZero = false;
else
upd(res, inv[pos]);
} else if ((s[pos] == '<' || s[pos] == '>') && c == '?') {
if (pos == 0)
isZero = true;
else
upd(res, pos);
}
s[pos] = c;
cout << (isZero? 0 : res) << endl;
}
return 0;
}
1886E - I Wanna be the Team Leader
Идея: BledDest
Разбор
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Решение (awoo)
#include <bits/stdc++.h>
#define forn(i, n) for (int i = 0; i < int(n); i++)
using namespace std;
int main() {
int n, m;
scanf("%d%d", &n, &m);
vector<int> a(n), b(m);
forn(i, n) scanf("%d", &a[i]);
forn(i, m) scanf("%d", &b[i]);
vector<int> ord(n);
iota(ord.begin(), ord.end(), 0);
sort(ord.begin(), ord.end(), [&a](int i, int j){
return a[i] > a[j];
});
vector<vector<int>> mn(m, vector<int>(n + 2));
forn(i, m){
int r = 0;
forn(l, n + 2){
r = min(n + 1, max(r, l + 1));
while (r <= n && a[ord[r - 1]] * (r - l) < b[i]) ++r;
mn[i][l] = r;
}
}
vector<int> dp(1 << m, n + 1);
dp[0] = 0;
vector<int> p(1 << m, -1);
forn(mask, 1 << m) forn(i, m) if (!((mask >> i) & 1) && dp[mask | (1 << i)] > mn[i][dp[mask]]){
dp[mask | (1 << i)] = mn[i][dp[mask]];
p[mask | (1 << i)] = mask;
}
int mask = (1 << m) - 1;
if (dp[mask] > n){
puts("NO");
return 0;
}
puts("YES");
vector<vector<int>> ans(n);
forn(_, m){
int i = __builtin_ctz(mask ^ p[mask]);
for (int j = dp[p[mask]]; j < dp[mask]; ++j)
ans[i].push_back(ord[j]);
mask = p[mask];
}
forn(i, m){
printf("%d", int(ans[i].size()));
for (int x : ans[i]) printf(" %d", x + 1);
puts("");
}
return 0;
}
Идея: BledDest
Разбор
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Решение (Neon)
#include <bits/stdc++.h>
using namespace std;
const int N = 3003;
int n;
int k[4];
vector<int> a[4];
struct segtree {
int sz;
int tot;
vector<int> t, p;
segtree(int sz) : sz(sz) {
tot = 0;
t = vector<int>(4 * sz);
p = vector<int>(4 * sz);
build(0, 0, sz);
}
void build(int v, int l, int r) {
if (l + 1 == r) {
t[v] = -l;
return;
}
int m = (l + r) / 2;
build(v * 2 + 1, l, m);
build(v * 2 + 2, m, r);
t[v] = max(t[v * 2 + 1], t[v * 2 + 2]);
}
void push(int v) {
if (p[v] == 0) return;
if (v + 1 < 2 * sz) {
t[v * 2 + 1] += p[v];
p[v * 2 + 1] += p[v];
t[v * 2 + 2] += p[v];
p[v * 2 + 2] += p[v];
p[v] = 0;
}
}
void upd(int v, int l, int r, int L, int R, int x) {
if (L >= R) return;
if (l == L && r == R) {
t[v] += x;
p[v] += x;
return;
}
push(v);
int m = (l + r) / 2;
upd(v * 2 + 1, l, m, L, min(m, R), x);
upd(v * 2 + 2, m, r, max(L, m), R, x);
t[v] = max(t[v * 2 + 1], t[v * 2 + 2]);
}
void upd(int pos, int x) {
tot += x;
upd(0, 0, sz, max(0, pos), sz, x);
}
int get(int v, int l, int r, int L, int R) {
if (L >= R) return -1e9;
if (l == L && r == R) return t[v];
push(v);
int m = (l + r) / 2;
return max(
get(v * 2 + 1, l, m, L, min(m, R)),
get(v * 2 + 2, m, r, max(L, m), R)
);
}
int get(int L) {
return get(0, 0, sz, max(0, L), sz);
}
int getBad(int v, int l, int r) {
if (t[v] <= 0) return -1;
if (l + 1 == r) return l;
push(v);
int m = (l + r) / 2;
if (t[v * 2 + 1] > 0) {
return getBad(v * 2 + 1, l, m);
} else {
return getBad(v * 2 + 2, m, r);
}
}
int getBad() {
return getBad(0, 0, sz);
}
};
int main() {
cin >> n;
int sz = 1;
for (int i = 0; i < n; ++i) {
int t, s;
cin >> t >> s;
a[t].push_back(s);
sz = max(sz, s + 1);
}
for (int t = 1; t < 4; ++t) {
sort(a[t].begin(), a[t].end());
k[t] = a[t].size();
}
reverse(a[2].begin(), a[2].end());
int ans = 1e4;
for (int len = 1; len <= k[2] + k[3] + 1; ++len) {
segtree L(sz), R(sz);
multiset<int> used;
for (int x : a[1]) L.upd(x, +1);
for (int x : a[2]) R.upd(x, +1);
for (int x : a[3]) {
L.upd(x - len, +1);
if (L.t[0] <= 0) {
used.insert(x - len);
} else {
L.upd(x - len, -1);
L.upd(x, +1);
R.upd(x, +1);
}
}
for (int i = 0; i <= k[2]; ++i) {
if (L.t[0] <= 0 && R.t[0] <= 0 && R.tot + 1 <= len)
ans = min(ans, n + (k[3] - (int)used.size()) + 2);
if (i == k[2]) break;
R.upd(a[2][i], -1);
L.upd(a[2][i] - len, +1);
int pos;
while ((pos = L.getBad()) != -1) {
auto it = used.upper_bound(pos);
if (it == used.begin()) break;
--it;
L.upd(*it, -1);
L.upd(*it + len, +1);
R.upd(*it + len, +1);
used.erase(it);
}
}
}
if (ans == 1e4) ans = -1;
cout << ans << '\n';
}