#include<bits/stdc++.h>
using namespace std;
using ll = long long;
using ld = long double;
using ull = unsigned long long;
using pii = pair<int, int>;
using pll = pair<ll, ll>;
using pld = pair<ld, ld>;
#define fi first
#define se second
#define pb push_back
#define pf push_front
#define mp make_pair
#define ins insert
#define btpc __builtin_popcount
#define btclz __builtin_clz
#define sz(x) (int)(x.size());
#define all(x) x.begin(), x.end()
#define debug(...) " [" << #__VA_ARGS__ ": " << (__VA_ARGS__) << "] "
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
int d4x[4] = {1, 0, -1, 0}; int d4y[4] = {0, 1, 0, -1};
int d8x[8] = {0, 1, 1, 1, 0, -1, -1, -1};
int d8y[8] = {1, 1, 0, -1, -1, -1, 0, 1};
template<class X, class Y>
bool minimize(X &x, const Y &y) {
if (x > y)
{
x = y;
return true;
}
return false;
}
template<class X, class Y>
bool maximize(X &x, const Y &y) {
if (x < y)
{
x = y;
return true;
}
return false;
}
const int MOD = 1e9 + 7; //998244353
template<class X, class Y>
void add(X &x, const Y &y) {
x = (x + y);
if(x >= MOD) x -= MOD;
}
template<class X, class Y>
void sub(X &x, const Y &y) {
x = (x - y);
if(x < 0) x += MOD;
}
/* Author : Le Ngoc Bao Anh, 12A5, LQD High School for Gifted Student*/
const ll INF = 2e18;
const int N = 1e5 + 10;
ll gcd(ll x, ll y) {
if(y == 0) return x;
return gcd(y, x % y);
}
ll lcm(ll x, ll y) {
return x / gcd(x, y) * y;
if(INF / x < y) return -1;
}
map<ll, int> cnt;
void solve() {
int n; ll A, B; cin >> n >> A >> B;
ll m = 0;
if(B % A == 0) {
if(INF / A < B) m = -1;
else m = A * B;
} else {
if((B + 1) % A == 0) m = -1;
else m = assert(1 == 0);
}
if(m == -1) m = INF;
ll ans = 0;
for(int i = 1; i <= n; i++) {
ll L, R; cin >> L >> R;
for(ll j = L; j <= R; j++) {
ll r = j % m;
if(!cnt[r]) ++ans;
cnt[r] = true;
}
}
cout << ans;
}
int main()
{
ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
#ifndef ONLINE_JUDGE
freopen("input.txt", "r", stdin);
freopen("output.txt", "w", stdout);
#else
//online
#endif
int tc = 1, ddd = 0;
// cin >> tc;
while(tc--) {
//ddd++;
//cout << "Case #" << ddd << ": ";
solve();
}
}
Compilation message
In file included from /usr/include/c++/10/cassert:44,
from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:33,
from strange_device.cpp:1:
strange_device.cpp: In function 'void solve()':
strange_device.cpp:90:18: error: void value not ignored as it ought to be
90 | else m = assert(1 == 0);
| ^~~~~~
strange_device.cpp: In function 'int main()':
strange_device.cpp:118:17: warning: unused variable 'ddd' [-Wunused-variable]
118 | int tc = 1, ddd = 0;
| ^~~
strange_device.cpp:112:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
112 | freopen("input.txt", "r", stdin);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
strange_device.cpp:113:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
113 | freopen("output.txt", "w", stdout);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
