| # | Submission time | Handle | Problem | Language | Result | Execution time | Memory |
|---|---|---|---|---|---|---|---|
| 989052 | 2024-05-27T11:07:04 Z | crafticat | Horses (IOI15_horses) | C++17 | 662 ms | 95316 KB |
#include <bits/stdc++.h>
using namespace std;
constexpr int MOD = 1e9 + 7;
using ll = __int128;
vector<int> x, y;
set<int> exists;
ll global = 1;
int n;
ll myPOW(ll a, ll b) {
if (b == 0) return 1;
ll v = myPOW(a, b / 2);
v *= v;
v %= MOD;
if (b % 2 == 1) v *= a;
v %= MOD;
return v;
}
ll inv(ll v) {
return myPOW(v, MOD - 2);
}
struct Segment {
Segment *left = nullptr, *right = nullptr;
int l, r, mid;
ll val = 1;
Segment(int l, int r) : l(l), r(r), mid((r + l) / 2) {
if (r - l > 1) {
left = new Segment(l,mid);
right = new Segment(mid,r);
}
}
int q(int a, int b) {
if (a >= r || b <= l) return 0;
if (a <= l && b >= r) return val;
return max(left->q(a,b), right->q(a,b));
}
void update(int pos, int u) {
if (r - l <= 1) {
val = u;
return;
}
if (pos < mid)
left->update(pos,u);
else
right->update(pos,u);
val = left->val * right->val;
}
};
Segment *seg;
int solve() {
int cor = n - 1;
ll mul = x[cor];
stack<int> prop;
prop.push(cor);
while (mul < MOD) {
auto it = exists.upper_bound(-cor);
if (it == exists.end()) break;
cor = -*it;
mul *= x[cor];
prop.push(cor);
}
ll left = global * inv(mul % MOD) % MOD;
ll ans = 0;
mul = 1;
while (!prop.empty()) {
auto c = prop.top(); prop.pop();
ans = max(ans, mul * seg->q(cor,c));
mul *= x[c];
ans = max(ans, y[c] * mul);
cor = c;
}
ans %= MOD;
return (ans * left) % MOD;
}
int init(int N, int X[], int Y[]) {
n = N;
x.resize(N);
y.resize(N);
seg = new Segment(0,N);
for (int i = 0; i < N; ++i) {
x[i] = X[i];
y[i] = Y[i];
global *= x[i];
global %= MOD;
if (x[i] != 1) {
exists.insert(-i);
} else
seg->update(i,y[i]);
}
return solve();
}
int updateX(int pos, int val) {
if (exists.count(-pos)) {
exists.erase(-pos);
} else seg->update(pos,0);
global *= inv(x[pos]);
global %= MOD;
x[pos] = val;
global *= x[pos];
global %= MOD;
if (x[pos] != 1) {
exists.insert(-pos);
} else seg->update(pos,y[pos]);
return solve();
}
int updateY(int pos, int val) {
y[pos] = val;
if (!exists.count(pos)) seg->update(pos,y[pos]);
return solve();
}
#if DEBUG
static char _buffer[1024];
static int _currentChar = 0;
static int _charsNumber = 0;
static FILE *_inputFile, *_outputFile;
static inline int _read() {
if (_charsNumber < 0) {
exit(1);
}
if (!_charsNumber || _currentChar == _charsNumber) {
_charsNumber = (int)fread(_buffer, sizeof(_buffer[0]), sizeof(_buffer), _inputFile);
_currentChar = 0;
}
if (_charsNumber <= 0) {
return -1;
}
return _buffer[_currentChar++];
}
static inline int _readInt() {
int c, x, s;
c = _read();
while (c <= 32) c = _read();
x = 0;
s = 1;
if (c == '-') {
s = -1;
c = _read();
}
while (c > 32) {
x *= 10;
x += c - '0';
c = _read();
}
if (s < 0) x = -x;
return x;
}
int main() {
_inputFile = fopen("horses.in", "rb");
int N; N = _readInt();
int *X = (int*)malloc(sizeof(int)*(unsigned int)N);
int *Y = (int*)malloc(sizeof(int)*(unsigned int)N);
for (int i = 0; i < N; i++) {
X[i] = _readInt();
}
for (int i = 0; i < N; i++) {
Y[i] = _readInt();
}
cout << init(N,X,Y) << endl;
int M; M = _readInt();
for (int i = 0; i < M; i++) {
int type; type = _readInt();
int pos; pos = _readInt();
int val; val = _readInt();
if (type == 1) {
cout << updateX(pos,val) << endl;
} else if (type == 2) {
cout << updateY(pos,val) << endl;
}
}
return 0;
}
#endif
Compilation message
| # | Verdict | Execution time | Memory | Grader output |
|---|---|---|---|---|
| 1 | Correct | 0 ms | 344 KB | Output is correct |
| 2 | Correct | 0 ms | 348 KB | Output is correct |
| 3 | Incorrect | 0 ms | 348 KB | Output isn't correct |
| 4 | Halted | 0 ms | 0 KB | - |
| # | Verdict | Execution time | Memory | Grader output |
|---|---|---|---|---|
| 1 | Correct | 1 ms | 348 KB | Output is correct |
| 2 | Correct | 0 ms | 348 KB | Output is correct |
| 3 | Incorrect | 0 ms | 348 KB | Output isn't correct |
| 4 | Halted | 0 ms | 0 KB | - |
| # | Verdict | Execution time | Memory | Grader output |
|---|---|---|---|---|
| 1 | Correct | 662 ms | 95264 KB | Output is correct |
| 2 | Correct | 347 ms | 95316 KB | Output is correct |
| 3 | Correct | 349 ms | 95232 KB | Output is correct |
| 4 | Correct | 365 ms | 95164 KB | Output is correct |
| # | Verdict | Execution time | Memory | Grader output |
|---|---|---|---|---|
| 1 | Correct | 0 ms | 348 KB | Output is correct |
| 2 | Correct | 0 ms | 348 KB | Output is correct |
| 3 | Incorrect | 0 ms | 348 KB | Output isn't correct |
| 4 | Halted | 0 ms | 0 KB | - |
| # | Verdict | Execution time | Memory | Grader output |
|---|---|---|---|---|
| 1 | Correct | 0 ms | 344 KB | Output is correct |
| 2 | Correct | 0 ms | 344 KB | Output is correct |
| 3 | Incorrect | 1 ms | 348 KB | Output isn't correct |
| 4 | Halted | 0 ms | 0 KB | - |