#pragma comment(linker, "/stack:200000000")
//#pragma GCC optimize("Ofast")
//#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
#pragma GCC optimize ("O3")
#pragma GCC target ("sse4")
#include <bits/stdc++.h>
#include <ext/pb_ds/tree_policy.hpp>
#include <ext/pb_ds/assoc_container.hpp>
using namespace std;
using namespace __gnu_pbds;
template <class T> using Tree = tree<T, null_type, less<T>, rb_tree_tag,tree_order_statistics_node_update>;
const double PI = 4 * atan(1);
#define sz(x) (int)(x).size()
#define ll long long
#define ld long double
#define mp make_pair
#define pb push_back
#define eb emplace_back
#define pii pair <int, int>
#define vi vector<int>
#define f first
#define s second
#define lb lower_bound
#define ub upper_bound
#define all(x) x.begin(), x.end()
#define vpi vector<pair<int, int>>
#define vpd vector<pair<double, double>>
#define pd pair<double, double>
#define f0r(i,a) for(int i=0;i<a;i++)
#define f1r(i,a,b) for(int i=a;i<b;i++)
#define trav(a, x) for (auto& a : x)
void fast_io(){
ios_base::sync_with_stdio(0);
cin.tie(NULL);
cout.tie(NULL);
}
void io(string taskname){
string fin = taskname + ".in";
string fout = taskname + ".out";
const char* FIN = fin.c_str();
const char* FOUT = fout.c_str();
freopen(FIN, "r", stdin);
freopen(FOUT, "w", stdout);
fast_io();
}
const long long MOD = 1000003;
constexpr int base = 10;
constexpr int base_digits = 1;
struct bigint {
// value == 0 is represented by empty z
vector<int> z; // digits
// sign == 1 <==> value >= 0
// sign == -1 <==> value < 0
int sign;
bigint() : sign(1) {}
bigint(long long v) { *this = v; }
bigint &operator=(long long v) {
sign = v < 0 ? -1 : 1; v *= sign;
z.clear(); for (; v > 0; v = v / base) z.push_back((int) (v % base));
return *this;
}
bigint(const string &s) { read(s); }
bigint &operator+=(const bigint &other) {
if (sign == other.sign) {
for (int i = 0, carry = 0; i < other.z.size() || carry; ++i) {
if (i == z.size())
z.push_back(0);
z[i] += carry + (i < other.z.size() ? other.z[i] : 0);
carry = z[i] >= base;
if (carry)
z[i] -= base;
}
} else if (other != 0 /* prevent infinite loop */) {
*this -= -other;
}
return *this;
}
friend bigint operator+(bigint a, const bigint &b) { return a += b; }
bigint &operator-=(const bigint &other) {
if (sign == other.sign) {
if (sign == 1 && *this >= other || sign == -1 && *this <= other) {
for (int i = 0, carry = 0; i < other.z.size() || carry; ++i) {
z[i] -= carry + (i < other.z.size() ? other.z[i] : 0);
carry = z[i] < 0;
if (carry)
z[i] += base;
}
trim();
} else {
*this = other - *this;
this->sign = -this->sign;
}
} else {
*this += -other;
}
return *this;
}
friend bigint operator-(bigint a, const bigint &b) { return a -= b; }
bigint &operator*=(int v) {
if (v < 0) sign = -sign, v = -v;
for (int i = 0, carry = 0; i < z.size() || carry; ++i) {
if (i == z.size())
z.push_back(0);
long long cur = (long long) z[i] * v + carry;
carry = (int) (cur / base);
z[i] = (int) (cur % base);
}
trim();
return *this;
}
bigint operator*(int v) const { return bigint(*this) *= v; }
friend pair<bigint, bigint> divmod(const bigint &a1, const bigint &b1) {
int norm = base / (b1.z.back() + 1);
bigint a = a1.abs() * norm;
bigint b = b1.abs() * norm;
bigint q, r;
q.z.resize(a.z.size());
for (int i = (int) a.z.size() - 1; i >= 0; i--) {
r *= base;
r += a.z[i];
int s1 = b.z.size() < r.z.size() ? r.z[b.z.size()] : 0;
int s2 = b.z.size() - 1 < r.z.size() ? r.z[b.z.size() - 1] : 0;
int d = (int) (((long long) s1 * base + s2) / b.z.back());
r -= b * d;
while (r < 0)
r += b, --d;
q.z[i] = d;
}
q.sign = a1.sign * b1.sign;
r.sign = a1.sign;
q.trim();
r.trim();
return {q, r / norm};
}
friend bigint sqrt(const bigint &a1) {
bigint a = a1;
while (a.z.empty() || a.z.size() % 2 == 1)
a.z.push_back(0);
int n = a.z.size();
int firstDigit = (int) ::sqrt((double) a.z[n - 1] * base + a.z[n - 2]);
int norm = base / (firstDigit + 1);
a *= norm;
a *= norm;
while (a.z.empty() || a.z.size() % 2 == 1)
a.z.push_back(0);
bigint r = (long long) a.z[n - 1] * base + a.z[n - 2];
firstDigit = (int) ::sqrt((double) a.z[n - 1] * base + a.z[n - 2]);
int q = firstDigit;
bigint res;
for (int j = n / 2 - 1; j >= 0; j--) {
for (;; --q) {
bigint r1 = (r - (res * 2 * base + q) * q) * base * base +
(j > 0 ? (long long) a.z[2 * j - 1] * base + a.z[2 * j - 2] : 0);
if (r1 >= 0) {
r = r1;
break;
}
}
res *= base;
res += q;
if (j > 0) {
int d1 = res.z.size() + 2 < r.z.size() ? r.z[res.z.size() + 2] : 0;
int d2 = res.z.size() + 1 < r.z.size() ? r.z[res.z.size() + 1] : 0;
int d3 = res.z.size() < r.z.size() ? r.z[res.z.size()] : 0;
q = (int) (((long long) d1 * base * base + (long long) d2 * base + d3) / (firstDigit * 2));
}
}
res.trim();
return res / norm;
}
bigint operator/(const bigint &v) const { return divmod(*this, v).first; }
bigint operator%(const bigint &v) const { return divmod(*this, v).second; }
bigint &operator/=(int v) {
if (v < 0) sign = -sign, v = -v;
for (int i = (int) z.size() - 1, rem = 0; i >= 0; --i) {
long long cur = z[i] + rem * (long long) base;
z[i] = (int) (cur / v);
rem = (int) (cur % v);
}
trim();
return *this;
}
bigint operator/(int v) const { return bigint(*this) /= v; }
int operator%(int v) const {
if (v < 0) v = -v;
int m = 0;
for (int i = (int) z.size() - 1; i >= 0; --i)
m = (int) ((z[i] + m * (long long) base) % v);
return m * sign;
}
bigint &operator*=(const bigint &v) { return *this = *this * v; }
bigint &operator/=(const bigint &v) { return *this = *this / v; }
bool operator<(const bigint &v) const {
if (sign != v.sign)
return sign < v.sign;
if (z.size() != v.z.size())
return z.size() * sign < v.z.size() * v.sign;
for (int i = (int) z.size() - 1; i >= 0; i--)
if (z[i] != v.z[i])
return z[i] * sign < v.z[i] * sign;
return false;
}
bool operator>(const bigint &v) const { return v < *this; }
bool operator<=(const bigint &v) const { return !(v < *this); }
bool operator>=(const bigint &v) const { return !(*this < v); }
bool operator==(const bigint &v) const { return !(*this < v) && !(v < *this); }
bool operator!=(const bigint &v) const { return *this < v || v < *this; }
void trim() {
while (!z.empty() && z.back() == 0) z.pop_back();
if (z.empty()) sign = 1;
}
bool isZero() const { return z.empty(); }
friend bigint operator-(bigint v) {
if (!v.z.empty()) v.sign = -v.sign;
return v;
}
bigint abs() const {
return sign == 1 ? *this : -*this;
}
long long longValue() const {
long long res = 0;
for (int i = (int) z.size() - 1; i >= 0; i--)
res = res * base + z[i];
return res * sign;
}
friend bigint gcd(const bigint &a, const bigint &b) {
return b.isZero() ? a : gcd(b, a % b);
}
friend bigint lcm(const bigint &a, const bigint &b) {
return a / gcd(a, b) * b;
}
void read(const string &s) {
sign = 1;
z.clear();
int pos = 0;
while (pos < s.size() && (s[pos] == '-' || s[pos] == '+')) {
if (s[pos] == '-')
sign = -sign;
++pos;
}
for (int i = (int) s.size() - 1; i >= pos; i -= base_digits) {
int x = 0;
for (int j = max(pos, i - base_digits + 1); j <= i; j++)
x = x * 10 + s[j] - '0';
z.push_back(x);
}
trim();
}
friend istream &operator>>(istream &stream, bigint &v) {
string s; stream >> s;
v.read(s);
return stream;
}
friend ostream &operator<<(ostream &stream, const bigint &v) {
if (v.sign == -1)
stream << '-';
stream << (v.z.empty() ? 0 : v.z.back());
for (int i = (int) v.z.size() - 2; i >= 0; --i)
stream << setw(base_digits) << setfill('0') << v.z[i];
return stream;
}
static vector<int> convert_base(const vector<int> &a, int old_digits, int new_digits) {
vector<long long> p(max(old_digits, new_digits) + 1);
p[0] = 1;
for (int i = 1; i < p.size(); i++)
p[i] = p[i - 1] * 10;
vector<int> res;
long long cur = 0;
int cur_digits = 0;
for (int v : a) {
cur += v * p[cur_digits];
cur_digits += old_digits;
while (cur_digits >= new_digits) {
res.push_back(int(cur % p[new_digits]));
cur /= p[new_digits];
cur_digits -= new_digits;
}
}
res.push_back((int) cur);
while (!res.empty() && res.back() == 0)
res.pop_back();
return res;
}
typedef vector<long long> vll;
static vll karatsubaMultiply(const vll &a, const vll &b) {
int n = a.size();
vll res(n + n);
if (n <= 32) {
for (int i = 0; i < n; i++)
for (int j = 0; j < n; j++)
res[i + j] += a[i] * b[j];
return res;
}
int k = n >> 1;
vll a1(a.begin(), a.begin() + k);
vll a2(a.begin() + k, a.end());
vll b1(b.begin(), b.begin() + k);
vll b2(b.begin() + k, b.end());
vll a1b1 = karatsubaMultiply(a1, b1);
vll a2b2 = karatsubaMultiply(a2, b2);
for (int i = 0; i < k; i++)
a2[i] += a1[i];
for (int i = 0; i < k; i++)
b2[i] += b1[i];
vll r = karatsubaMultiply(a2, b2);
for (int i = 0; i < a1b1.size(); i++)
r[i] -= a1b1[i];
for (int i = 0; i < a2b2.size(); i++)
r[i] -= a2b2[i];
for (int i = 0; i < r.size(); i++)
res[i + k] += r[i];
for (int i = 0; i < a1b1.size(); i++)
res[i] += a1b1[i];
for (int i = 0; i < a2b2.size(); i++)
res[i + n] += a2b2[i];
return res;
}
bigint operator*(const bigint &v) const {
vector<int> a6 = convert_base(this->z, base_digits, 6);
vector<int> b6 = convert_base(v.z, base_digits, 6);
vll a(a6.begin(), a6.end());
vll b(b6.begin(), b6.end());
while (a.size() < b.size())
a.push_back(0);
while (b.size() < a.size())
b.push_back(0);
while (a.size() & (a.size() - 1))
a.push_back(0), b.push_back(0);
vll c = karatsubaMultiply(a, b);
bigint res;
res.sign = sign * v.sign;
for (int i = 0, carry = 0; i < c.size(); i++) {
long long cur = c[i] + carry;
res.z.push_back((int) (cur % 1000000));
carry = (int) (cur / 1000000);
}
res.z = convert_base(res.z, 6, base_digits);
res.trim();
return res;
}
};
vector<pair<ll, ll>> intervals;
int main(){
fast_io();
ll n, a, b;
cin >> n >> a >> b;
bigint A = bigint(a);
bigint B = bigint(b);
ll mod = -1;
bigint tmp = lcm(A*gcd(A, B), B)/gcd(B+1, A);
if(tmp<= bigint((ll) 1e18)){
mod = tmp.longValue();
}
if(mod == -1){
ll ans = 0;
f0r(i, n){
ll l, r;
cin >> l >> r;
ans += (r-l + 1);
}
cout << ans << endl;
return 0;
}
f0r(i, n){
ll l, r;
cin >> l >> r;
if(r-l>= mod-1){
cout << mod << endl;
return 0;
}
l%= mod;
r%= mod;
if(l>r){
intervals.eb(mp(l, mod-1));
intervals.eb(mp(0, r));
// cout << "here" << endl;
}
else{
intervals.eb(mp(l, r));
}
}
sort(all(intervals));
ll ans = 0;
f0r(i, sz(intervals)){
// cout << intervals[i].f << " df " << intervals[i].s << endl;
if(i == 0){
ans += (intervals[i].s - intervals[i].f + 1);
}
else{
ll l = intervals[i].f;
ll r = intervals[i].s;
ll lo = intervals[i-1].f;
ll hi = intervals[i-1].s;
if(r<= hi) continue;
if(l>hi){
ans += (r - l + 1);
}
else{
ans += (r - hi);
}
}
}
cout << ans << endl;
return 0;
}
Compilation message
strange_device.cpp:1:0: warning: ignoring #pragma comment [-Wunknown-pragmas]
#pragma comment(linker, "/stack:200000000")
strange_device.cpp: In member function 'bigint& bigint::operator+=(const bigint&)':
strange_device.cpp:76:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for (int i = 0, carry = 0; i < other.z.size() || carry; ++i) {
~~^~~~~~~~~~~~~~~~
strange_device.cpp:77:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
if (i == z.size())
~~^~~~~~~~~~~
strange_device.cpp:79:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
z[i] += carry + (i < other.z.size() ? other.z[i] : 0);
~~^~~~~~~~~~~~~~~~
strange_device.cpp: In member function 'bigint& bigint::operator-=(const bigint&)':
strange_device.cpp:94:27: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
if (sign == 1 && *this >= other || sign == -1 && *this <= other) {
~~~~~~~~~~^~~~~~~~~~~~~~~~~
strange_device.cpp:95:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for (int i = 0, carry = 0; i < other.z.size() || carry; ++i) {
~~^~~~~~~~~~~~~~~~
strange_device.cpp:96:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
z[i] -= carry + (i < other.z.size() ? other.z[i] : 0);
~~^~~~~~~~~~~~~~~~
strange_device.cpp: In member function 'bigint& bigint::operator*=(int)':
strange_device.cpp:116:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for (int i = 0, carry = 0; i < z.size() || carry; ++i) {
~~^~~~~~~~~~
strange_device.cpp:117:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
if (i == z.size())
~~^~~~~~~~~~~
strange_device.cpp: In member function 'void bigint::read(const string&)':
strange_device.cpp:280:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
while (pos < s.size() && (s[pos] == '-' || s[pos] == '+')) {
~~~~^~~~~~~~~~
strange_device.cpp: In static member function 'static std::vector<int> bigint::convert_base(const std::vector<int>&, int, int)':
strange_device.cpp:312:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for (int i = 1; i < p.size(); i++)
~~^~~~~~~~~~
strange_device.cpp: In static member function 'static bigint::vll bigint::karatsubaMultiply(const vll&, const vll&)':
strange_device.cpp:359:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for (int i = 0; i < a1b1.size(); i++)
~~^~~~~~~~~~~~~
strange_device.cpp:361:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for (int i = 0; i < a2b2.size(); i++)
~~^~~~~~~~~~~~~
strange_device.cpp:364:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for (int i = 0; i < r.size(); i++)
~~^~~~~~~~~~
strange_device.cpp:366:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for (int i = 0; i < a1b1.size(); i++)
~~^~~~~~~~~~~~~
strange_device.cpp:368:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for (int i = 0; i < a2b2.size(); i++)
~~^~~~~~~~~~~~~
strange_device.cpp: In member function 'bigint bigint::operator*(const bigint&) const':
strange_device.cpp:387:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for (int i = 0, carry = 0; i < c.size(); i++) {
~~^~~~~~~~~~
strange_device.cpp: In function 'int main()':
strange_device.cpp:449:16: warning: unused variable 'lo' [-Wunused-variable]
ll lo = intervals[i-1].f;
^~
strange_device.cpp: In function 'void io(std::__cxx11::string)':
strange_device.cpp:47:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
freopen(FIN, "r", stdin);
~~~~~~~^~~~~~~~~~~~~~~~~
strange_device.cpp:48:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
freopen(FOUT, "w", stdout);
~~~~~~~^~~~~~~~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
2 ms |
376 KB |
Output is correct |
| 2 |
Incorrect |
9 ms |
1144 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
2 ms |
252 KB |
Output is correct |
| 2 |
Correct |
2 ms |
376 KB |
Output is correct |
| 3 |
Correct |
2 ms |
252 KB |
Output is correct |
| 4 |
Correct |
2 ms |
376 KB |
Output is correct |
| 5 |
Correct |
2 ms |
376 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
2 ms |
376 KB |
Output is correct |
| 2 |
Incorrect |
3 ms |
376 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
2 ms |
376 KB |
Output is correct |
| 2 |
Incorrect |
614 ms |
17060 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
2 ms |
376 KB |
Output is correct |
| 2 |
Incorrect |
614 ms |
17060 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
2 ms |
376 KB |
Output is correct |
| 2 |
Incorrect |
614 ms |
17060 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
2 ms |
252 KB |
Output is correct |
| 2 |
Incorrect |
70 ms |
3264 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
2 ms |
376 KB |
Output is correct |
| 2 |
Incorrect |
9 ms |
1144 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
