Submission #256821

#	Time	Username	Problem	Language	Result	Execution time	Memory
256821		2qbingxuan	Strange Device (APIO19_strange_device)	C++17	65 / 100	792 ms	33524 KiB

strange_device

//   __________________
//  | ________________ |
//  ||          ____  ||
//  ||   /\    |      ||
//  ||  /__\   |      ||
//  || /    \  |____  ||
//  ||________________||
//  |__________________|
//  \###################\
//   \###################\
//    \        ____       \
//     \_______\___\_______\
// An AC a day keeps the doctor away.

#pragma GCC optimize("Ofast")
#pragma loop_opt(on)
#include <bits/extc++.h>
#ifdef local
#define safe std::cerr<<__PRETTY_FUNCTION__<<" line "<<__LINE__<<" safe\n"
#define debug(...) qqbx(#__VA_ARGS__,  __VA_ARGS__)
template <typename H, typename ...T> constexpr void qqbx(const char *s, const H &h, T &&...args) {
    for(; *s && *s != ','; ++s) if(*s != ' ') std::cerr << *s;
    std::cerr << " = " << h << (sizeof...(T) ? ", " : "\n");
    if constexpr(sizeof...(T)) qqbx(++s, args...); // C++ 17!
}
#else
#include <bits/stdc++.h>
#define debug(...) ((void)0)
#define safe ((void)0)
#endif // local
#define all(v) begin(v),end(v)
#define get_pos(v,x) int(lower_bound(begin(v),end(v),x)-begin(v))
#define sort_uni(v) sort(begin(v),end(v)),v.erase(unique(begin(v),end(v)),end(v))
#define pb emplace_back
#define ff first
#define ss second
#define mem(v,x) memset(v,x,sizeof v)

using namespace std;
using namespace __gnu_pbds;
typedef int64_t ll;
typedef long double ld;
typedef pair<ll,ll> pll;
typedef pair<ld,ld> pld;
template <typename T> using max_heap = std::priority_queue<T,vector<T>,less<T> >;
template <typename T> using min_heap = std::priority_queue<T,vector<T>,greater<T> >;
template <typename T> using rbt = tree<T,null_type,less<T>,rb_tree_tag,tree_order_statistics_node_update>;
constexpr ld PI = acos(-1), eps = 1e-9;
constexpr ll N = 1000325, INF = 2e18, MOD = 1000000007, K = 105, inf = 1e9;
constexpr inline ll cdiv(ll x, ll m) { return x/m + ((x<0 ^ m>0) && (x%m)); } // ceiling divide
constexpr inline ll modpow(ll e,ll p,ll m=MOD) { ll r=1; for(e%=m;p;p>>=1,e=e*e%m) if(p&1) r=r*e%m; return r; }

signed main() {
    ios_base::sync_with_stdio(0), cin.tie(0);
    int n;
    ll A, B;
    cin >> n >> A >> B;
    ll k = A / __gcd(A, B+1);
    if(k <= INF / B) k *= B;
    else {
        ll ans = 0;
        for(int i = 0; i < n; i++) {
            ll l, r;
            cin >> l >> r;
            ans += r-l+1;
        }
        cout << ans << '\n';
        return 0;
    }
    /* debug(k); */
    /* for(int i = 0; i < k; i++) { */
    /*     ll x = (i + i/B) % A; */
    /*     ll y = i%B; */
    /*     cout << x << ' ' << y << '\n'; */
    /* } */
    /* return 0; */
    vector<pair<ll,int>> evt;
    for(int i = 0; i < n; i++) {
        ll l, r;
        cin >> l >> r;
        ++r;
        l %= k;
        r %= k;
        if(l < r)
            evt.pb(l, 1), evt.pb(r, -1);
        else
            evt.pb(0, 1), evt.pb(r, -1), evt.pb(l, 1), evt.pb(k, -1);
    }
    evt.pb(k, 0);
    sort(all(evt));
    ll ans = 0;
    for(int i = 0, j, c = 0; i < evt.size(); i = j) {
        for(j = i; j < evt.size(); j++) {
            if(evt[j].first != evt[i].first) break;
            c += evt[j].second;
        }
        if(c && j != evt.size()) ans += evt[j].first - evt[i].first;
    }
    cout << ans << '\n';
}

Compilation message (stderr)

strange_device.cpp:9:1: warning: multi-line comment [-Wcomment]
 //  \###################\
 ^
strange_device.cpp:16:0: warning: ignoring #pragma loop_opt  [-Wunknown-pragmas]
 #pragma loop_opt(on)
 
strange_device.cpp: In function 'constexpr ll cdiv(ll, ll)':
strange_device.cpp:50:56: warning: suggest parentheses around comparison in operand of '^' [-Wparentheses]
 constexpr inline ll cdiv(ll x, ll m) { return x/m + ((x<0 ^ m>0) && (x%m)); } // ceiling divide
                                                       ~^~
strange_device.cpp: In function 'int main()':
strange_device.cpp:92:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i = 0, j, c = 0; i < evt.size(); i = j) {
                              ~~^~~~~~~~~~~~
strange_device.cpp:93:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for(j = i; j < evt.size(); j++) {
                    ~~^~~~~~~~~~~~
strange_device.cpp:97:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         if(c && j != evt.size()) ans += evt[j].first - evt[i].first;
                 ~~^~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 0 / 5
• Subtask 3: 5 / 5
• Subtask 4: 5 / 5
• Subtask 5: 5 / 5
• Subtask 6: 20 / 20
• Subtask 7: 20 / 20
• Subtask 8: 0 / 30