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#line 2 "/Users/kaage/Desktop/ProgrammingWorkspace/library/other/template.hpp"
#define _CRT_SECURE_NO_WARNINGS
#pragma target("avx2")
#pragma optimize("O3")
#pragma optimize("unroll-loops")
#include <algorithm>
#include <bitset>
#include <cassert>
#include <cfloat>
#include <climits>
#include <cmath>
#include <complex>
#include <ctime>
#include <deque>
#include <fstream>
#include <functional>
#include <iomanip>
#include <iostream>
#include <iterator>
#include <list>
#include <map>
#include <memory>
#include <queue>
#include <random>
#include <set>
#include <stack>
#include <string>
#include <string.h>
#include <unordered_map>
#include <unordered_set>
#include <utility>
#include <vector>
#define rep(i,n) for(int i=0;i<(n);i++)
#define REP(i,n) for(int i=1;i<=(n);i++)
#define all(V) V.begin(),V.end()
typedef long long lint;
typedef unsigned long long ulint;
typedef std::pair<int, int> P;
typedef std::pair<lint, lint> LP;
constexpr int INF = INT_MAX/2;
constexpr lint LINF = LLONG_MAX/2;
constexpr double eps = DBL_EPSILON;
constexpr double PI=3.141592653589793238462643383279;
template<class T>
class prique :public std::priority_queue<T, std::vector<T>, std::greater<T>> {};
template <class T, class U>
inline bool chmax(T& lhs, const U& rhs) {
if (lhs < rhs) {
lhs = rhs;
return 1;
}
return 0;
}
template <class T, class U>
inline bool chmin(T& lhs, const U& rhs) {
if (lhs > rhs) {
lhs = rhs;
return 1;
}
return 0;
}
inline lint gcd(lint a, lint b) {
while (b) {
lint c = a;
a = b; b = c % b;
}
return a;
}
inline lint lcm(lint a, lint b) {
return a / gcd(a, b) * b;
}
bool isprime(lint n) {
if (n == 1)return false;
for (int i = 2; i * i <= n; i++) {
if (n % i == 0)return false;
}
return true;
}
template<typename T>
T mypow(T a, lint b) {
T res(1);
while(b){
if(b&1)res*=a;
a*=a;
b>>=1;
}
return res;
}
lint modpow(lint a, lint b, lint m) {
lint res(1);
while(b){
if(b&1){
res*=a;res%=m;
}
a*=a;a%=m;
b>>=1;
}
return res;
}
template<typename T>
void printArray(std::vector<T>& vec) {
rep(i, vec.size()){
std::cout << vec[i];
std::cout<<(i==(int)vec.size()-1?"\n":" ");
}
}
template<typename T>
void printArray(T l, T r) {
T rprev = std::prev(r);
for (T i = l; i != rprev; i++) {
std::cout << *i << " ";
}
std::cout << *rprev << std::endl;
}
LP extGcd(lint a,lint b) {
if(b==0)return {1,0};
LP s=extGcd(b,a%b);
std::swap(s.first,s.second);
s.second-=a/b*s.first;
return s;
}
LP ChineseRem(const lint& b1,const lint& m1,const lint& b2,const lint& m2) {
lint p=extGcd(m1,m2).first;
lint tmp=(b2-b1)*p%m2;
lint r=(b1+m1*tmp+m1*m2)%(m1*m2);
return std::make_pair(r,m1*m2);
}
/*template<typename F>
inline constexpr decltype(auto) lambda_fix(F&& f){
return [f=std::forward<F>(f)](auto&&... args){
return f(f,std::forward<decltype(args)>(args)...);
};
}*/
#line 2 "main.cpp"
int n;
lint a,b,l[1000010],r[1000010];
int main(){
scanf("%d%lld%lld",&n,&a,&b);
rep(i,n)scanf("%lld%lld",l+i,r+i);
lint tmp=a/gcd(b+1,a);
if(1000000000000000001/b<=tmp){
lint ans=0;
rep(i,n)ans+=r[i]-l[i]+1;
printf("%lld\n",ans);
return 0;
}
lint per=tmp*b;
std::vector<LP> vec;
rep(i,n){
if(r[i]-l[i]+1>=per){
printf("%lld\n",per);
return 0;
}
if(l[i]/per!=r[i]/per){
vec.emplace_back(l[i]%per,per);
vec.emplace_back(0,(r[i]+1)%per);
}
else vec.emplace_back(l[i]%per,r[i]%per+1);
}
std::sort(all(vec));
lint nowlast=-1,ans=0;
for(const LP& p:vec){
if(nowlast<p.first){
ans+=p.second-p.first;
nowlast=p.second;
}
else{
ans+=p.second-nowlast;
nowlast=p.second;
}
}
printf("%lld\n",ans);
}
컴파일 시 표준 에러 (stderr) 메시지
/Users/kaage/Desktop/ProgrammingWorkspace/library/other/template.hpp:3: warning: ignoring #pragma target [-Wunknown-pragmas]
/Users/kaage/Desktop/ProgrammingWorkspace/library/other/template.hpp:4: warning: ignoring #pragma optimize [-Wunknown-pragmas]
/Users/kaage/Desktop/ProgrammingWorkspace/library/other/template.hpp:5: warning: ignoring #pragma optimize [-Wunknown-pragmas]
main.cpp: In function 'int main()':
main.cpp:5:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
main.cpp:6:15: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
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