Submission #887185

#	Time	Username	Problem	Language	Result	Execution time	Memory
887185		Kutan	Strange Device (APIO19_strange_device)	C++14	10 / 100	341 ms	58820 KiB

strange_device

// Cao Quang Hung
#include <cassert>
#include <cctype>
#include <cerrno>
#include <cfloat>
#include <ciso646>
#include <climits>
#include <clocale>
#include <cmath>
#include <csetjmp>
#include <csignal>
#include <cstdarg>
#include <cstddef>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <ctime>
#include <ccomplex>
#include <cfenv>
#include <cinttypes>
#include <cstdbool>
#include <cstdint>
#include <ctgmath>
#include <cwchar>
#include <cwctype>
#include <algorithm>
#include <bitset>
#include <complex>
#include <deque>
#include <exception>
#include <fstream>
#include <functional>
#include <iomanip>
#include <ios>
#include <iosfwd>
#include <iostream>
#include <istream>
#include <iterator>
#include <limits>
#include <list>
#include <locale>
#include <map>
#include <memory>
#include <new>
#include <numeric>
#include <ostream>
#include <queue>
#include <set>
#include <sstream>
#include <stack>
#include <stdexcept>
#include <streambuf>
#include <string>
#include <typeinfo>
#include <utility>
#include <valarray>
#include <vector>
#include <array>
#include <atomic>
#include <chrono>
#include <condition_variable>
#include <forward_list>
#include <future>
#include <initializer_list>
#include <mutex>
#include <random>
#include <ratio>
#include <regex>
#include <scoped_allocator>
#include <system_error>
#include <thread>
#include <tuple>
#include <typeindex>
#include <type_traits>
#include <unordered_map>
#include <unordered_set>
 
using namespace std;
#define pb push_back
#define eb emplace_back
#define mp make_pair
#define pii pair<int,int>
#define pll pair<long long , long long>
#define vi vector<int>
#define vpii vector<pii>
#define SZ(x) ((int)(x.size()))
#define fi first
#define se second
#define IN(x,y) ((y).find((x))!=(y).end())
#define ALL(t) t.begin(),t.end()
#define FOREACH(i,t) for (typeof(t.begin()) i=t.begin(); i!=t.end(); i++)
#define REP(i,a,b) for(int (i)=(a);(i)<=(b);++i)
#define REPD(i,a,b) for(int (i)=(a); (i)>=(b);--i)
#define FOR(i, n) for (int (i) = 0; (i) < (n); ++(i))
#define dem(x) __builtin_popcount(x)
#define Mask(x) (1LL << (x))
#define BIT(x, i) ((x) >> (i) & 1)
#define ln '\n'
#define io_faster ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
///mt19937 rnd(time(0));
 
const int INF = 1e9 , mod = 1e9 + 7;
 
template <class T1, class T2>
inline T1 mul(T1& x, const T2 &k){ return x = (1LL * x * k) % mod; }
 
template <class T1 , class T2>
inline T1 pw(T1 x, T2 k){T1 res = 1; for (; k ; k >>= 1){ if (k & 1) mul(res, x); mul(x, x); } return res;}
 
template <class T>
inline bool minimize(T &x, const T &y){ if (x > y){x = y; return 1;} return 0; }
 
template <class T>
inline bool maximize(T &x, const T &y){ if (x < y){x = y; return 1;} return 0; }
 
template <class T>
inline void add(T &x , const T &y){ if ((x += y) >= mod) x -= mod; }
 
template <class T>
inline T product (const T &x , const T &y) { return 1LL * x * y % mod; }
 
#define PROB "a"
void file(){
    if(fopen(PROB".inp", "r")){
        freopen(PROB".inp","r",stdin);
        freopen(PROB".out","w",stdout);
    }
}
void sinh_(){
//    srand(time(0));
//    freopen(PROB".inp" , "w" , stdout);
//    int n;
}
 
typedef long long ll;
typedef double db;
const int N = 1e6 + 5;
 
int n;
ll A, B, l[N], r[N];
 
void readip(){
    cin >> n >> A >> B;
    REP(i, 1, n) cin >> l[i] >> r[i];
}
 
namespace sub1{
    bool check() {
        ll s = 0;
        REP(i, 1, n) s += r[i] - l[i] + 1;
        return s <= 1e6;
    }
 
    void solve() {
        vector<pair<ll, ll>> distinct;
        REP(i, 1, n) {
            for (ll x = l[i]; x <= r[i]; ++x) 
                distinct.eb((x + x / B) % A , x % B);
        }
        sort(ALL(distinct));
        distinct.erase(unique(ALL(distinct)), distinct.end());
        cout << distinct.size() << ln;
    }
};
 
namespace sub2{
    void solve() {
        if (A & 1) {
            // cycle size A
            vector<pair<ll, ll>> segments[2];
            REP(i, 1, n) {
                ll lef = (2LL * l[i]) % A, rig = (2LL * r[i]) % A;
                if (lef % 2 != rig % 2) {
                    if (lef % 2 == 0) {
                        segments[0].eb(lef, A - 1);
                        segments[1].eb(1, rig);
                    }
                    else {  
                        segments[1].eb(lef, A - 2);
                        segments[0].eb(0, rig);
                    }
                }
                else segments[lef % 2].eb(lef, rig);
            }       
        
            ll res = 0;
            FOR(i, 2) {
                if (segments[i].empty()) continue;
                sort(ALL(segments[i]));
                vector<pair<ll, ll>> hihi;
                hihi.eb(segments[i][0]);
                for (int j = 1; j < segments[i].size(); ++j) {
                    ll r = segments[i][j].second;
                    ll l = segments[i][j].first;
                    if (r <= hihi.back().se) continue;
                    if (l <= hihi.back().se) hihi.back().se = r;
                    else hihi.eb(l, r);
                }
                for (auto it : hihi)
                    res += (it.se - it.fi) / 2 + 1;
            }
            cout << res << ln;
        }
        else {  
            // cycle size A / 2
            vector<pair<ll, ll>> segments;
            REP(i, 1, n) {
                ll lef = (2LL * l[i]) % A;
                ll rig = (2LL * r[i]) % A;
                ll tmp = (A - lef) / 2;
                if (r[i] - l[i] + 1 <= tmp) {
                    segments.eb(lef, rig);
                }
                else {
                    segments.eb(lef, A - 2);
                    segments.eb(0, rig);
                }
            }
            ll res = 0;
            if (segments.empty()) {
                cout << 0 << ln;
                return;
            }
            vector<pair<ll, ll>> hihi;
            hihi.eb(segments[0]);
            REP(i, 1, segments.size() - 1) {
                ll r = segments[i].second;
                    ll l = segments[i].first;
                    if (r <= hihi.back().se) continue;
                    if (l <= hihi.back().se) hihi.back().se = r;
                    else hihi.eb(l, r);
            }
              for (auto it : hihi)
                    res += (it.se - it.fi) / 2 + 1;
            cout << res << ln;
        }
    }
};
void solve(){       
    if (sub1::check()) {
        sub1::solve();
        return;
    }    
 
    if (B == 1) {
        sub2::solve();
        return;
    }
 
    // int m = 50;
    // for (int i = 35; i <= 10000; i += m) {
    //     REP(j, 0, m - 1) cout << ((i + j)  * 2) % m << ' ';
    //     cout << ln;
    // }
}
 
int main(){
    sinh_();
    io_faster
    file();
    int t = 1;
//    cin >> t;
    while (t--){
        readip();
        solve();
    }
}

Compilation message (stderr)

strange_device.cpp: In function 'void readip()':
strange_device.cpp:92:28: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
   92 | #define REP(i,a,b) for(int (i)=(a);(i)<=(b);++i)
      |                            ^
strange_device.cpp:144:5: note: in expansion of macro 'REP'
  144 |     REP(i, 1, n) cin >> l[i] >> r[i];
      |     ^~~
strange_device.cpp: In function 'bool sub1::check()':
strange_device.cpp:92:28: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
   92 | #define REP(i,a,b) for(int (i)=(a);(i)<=(b);++i)
      |                            ^
strange_device.cpp:150:9: note: in expansion of macro 'REP'
  150 |         REP(i, 1, n) s += r[i] - l[i] + 1;
      |         ^~~
strange_device.cpp: In function 'void sub1::solve()':
strange_device.cpp:92:28: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
   92 | #define REP(i,a,b) for(int (i)=(a);(i)<=(b);++i)
      |                            ^
strange_device.cpp:156:9: note: in expansion of macro 'REP'
  156 |         REP(i, 1, n) {
      |         ^~~
strange_device.cpp: In function 'void sub2::solve()':
strange_device.cpp:92:28: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
   92 | #define REP(i,a,b) for(int (i)=(a);(i)<=(b);++i)
      |                            ^
strange_device.cpp:171:13: note: in expansion of macro 'REP'
  171 |             REP(i, 1, n) {
      |             ^~~
strange_device.cpp:94:28: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
   94 | #define FOR(i, n) for (int (i) = 0; (i) < (n); ++(i))
      |                            ^
strange_device.cpp:187:13: note: in expansion of macro 'FOR'
  187 |             FOR(i, 2) {
      |             ^~~
strange_device.cpp:192:35: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  192 |                 for (int j = 1; j < segments[i].size(); ++j) {
      |                                 ~~^~~~~~~~~~~~~~~~~~~~
strange_device.cpp:92:28: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
   92 | #define REP(i,a,b) for(int (i)=(a);(i)<=(b);++i)
      |                            ^
strange_device.cpp:207:13: note: in expansion of macro 'REP'
  207 |             REP(i, 1, n) {
      |             ^~~
strange_device.cpp:92:28: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
   92 | #define REP(i,a,b) for(int (i)=(a);(i)<=(b);++i)
      |                            ^
strange_device.cpp:226:13: note: in expansion of macro 'REP'
  226 |             REP(i, 1, segments.size() - 1) {
      |             ^~~
strange_device.cpp:92:39: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   92 | #define REP(i,a,b) for(int (i)=(a);(i)<=(b);++i)
      |                                    ~~~^~~~~
strange_device.cpp:226:13: note: in expansion of macro 'REP'
  226 |             REP(i, 1, segments.size() - 1) {
      |             ^~~
strange_device.cpp: In function 'void file()':
strange_device.cpp:125:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  125 |         freopen(PROB".inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
strange_device.cpp:126:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  126 |         freopen(PROB".out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

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