Submission #123637

#	Time	Username	Problem	Language	Result	Execution time	Memory
123637		duality	Strange Device (APIO19_strange_device)	C++11	100 / 100	668 ms	16996 KiB

strange_device

#define DEBUG 0

#include <bits/stdc++.h>
using namespace std;

#if DEBUG
// basic debugging macros
int __i__,__j__;
#define printLine(l) for(__i__=0;__i__<l;__i__++){cout<<"-";}cout<<endl
#define printLine2(l,c) for(__i__=0;__i__<l;__i__++){cout<<c;}cout<<endl
#define printVar(n) cout<<#n<<": "<<n<<endl
#define printArr(a,l) cout<<#a<<": ";for(__i__=0;__i__<l;__i__++){cout<<a[__i__]<<" ";}cout<<endl
#define print2dArr(a,r,c) cout<<#a<<":\n";for(__i__=0;__i__<r;__i__++){for(__j__=0;__j__<c;__j__++){cout<<a[__i__][__j__]<<" ";}cout<<endl;}
#define print2dArr2(a,r,c,l) cout<<#a<<":\n";for(__i__=0;__i__<r;__i__++){for(__j__=0;__j__<c;__j__++){cout<<setw(l)<<setfill(' ')<<a[__i__][__j__]<<" ";}cout<<endl;}

// advanced debugging class
// debug 1,2,'A',"test";
class _Debug {
    public:
        template<typename T>
        _Debug& operator,(T val) {
            cout << val << endl;
            return *this;
        }
};
#define debug _Debug(),
#else
#define printLine(l)
#define printLine2(l,c)
#define printVar(n)
#define printArr(a,l)
#define print2dArr(a,r,c)
#define print2dArr2(a,r,c,l)
#define debug
#endif

// define
#define MAX_VAL 999999999
#define MAX_VAL_2 999999999999999999LL
#define EPS 1e-6
#define mp make_pair
#define pb push_back

// typedef
typedef unsigned int UI;
typedef long long int LLI;
typedef unsigned long long int ULLI;
typedef unsigned short int US;
typedef pair<int,int> pii;
typedef pair<LLI,LLI> plli;
typedef vector<int> vi;
typedef vector<LLI> vlli;
typedef vector<pii> vpii;
typedef vector<plli> vplli;

// ---------- END OF TEMPLATE ----------

LLI gcd(LLI a,LLI b) {
    LLI t;
    while (a > 0) t = b % a,b = a,a = t;
    return b;
}
vplli v;
int main() {
    int i;
    int n;
    LLI A,B,p,l,r;
    scanf("%d %lld %lld",&n,&A,&B);
    A /= gcd(A,B+1);
    if ((double) A*B > 2e18) p = 2e18;
    else p = A*B;
    for (i = 0; i < n; i++) {
        scanf("%lld %lld",&l,&r);
        if (r-l >= p) v.pb(mp(0,p-1));
        else {
            l %= p,r %= p;
            if (l <= r) v.pb(mp(l,r));
            else v.pb(mp(l,p-1)),v.pb(mp(0,r));
        }
    }

    LLI ans = p,m = 0;
    sort(v.begin(),v.end());
    for (i = 0; i < v.size(); i++) {
        if (v[i].first >= m) ans -= v[i].first-m;
        m = max(m,v[i].second+1);
    }
    ans -= p-m;
    printf("%lld\n",ans);

    return 0;
}

Compilation message (stderr)

strange_device.cpp: In function 'int main()':
strange_device.cpp:84:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (i = 0; i < v.size(); i++) {
                 ~~^~~~~~~~~~
strange_device.cpp:68:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %lld %lld",&n,&A,&B);
     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
strange_device.cpp:73:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%lld %lld",&l,&r);
         ~~~~~^~~~~~~~~~~~~~~~~~~

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