Submission #78696

#	Time	Username	Problem	Language	Result	Execution time	Memory
78696		duality	The Forest of Fangorn (CEOI14_fangorn)	C++11	100 / 100	298 ms	1548 KiB

fangorn

#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 ----------
#define x first
#define y second
const double PI = acos(-1.0);

int cx[10000],cy[10000];
int tx[2000],ty[2000];
pii a[2000],b[2000];
double diff(double a,double b) {
    return (a > b) ? a-b:a-b+2*PI;
}
int ccw(pii a,pii b,pii c) {
    return (LLI) (b.x-a.x)*(c.y-b.y) > (LLI) (b.y-a.y)*(c.x-b.x);
}
vi ans;
int main() {
    int i;
    int C,N;
    int gx,gy;
    scanf("%*d %*d %d %d %d",&gx,&gy,&C);
    for (i = 0; i < C; i++) scanf("%d %d",&cx[i],&cy[i]);
    scanf("%d",&N);
    for (i = 0; i < N; i++) scanf("%d %d",&tx[i],&ty[i]);

    int j;
    for (i = 0; i < N; i++) {
        pair<double,pii> ca = mp(1e99,mp(0,0)),cb;
        double angle = atan2(ty[i]-gy,tx[i]-gx);
        for (j = 0; j < N; j++) {
            if (i != j) {
                pair<double,pii> t = mp(atan2(ty[j]-ty[i],tx[j]-tx[i]),mp(tx[j],ty[j]));
                if (ca.first == 1e99) ca = cb = t;
                else {
                    if (diff(angle,t.first) < diff(angle,ca.first)) ca = t;
                    if (diff(t.first,angle) < diff(cb.first,angle)) cb = t;
                }
            }
        }
        a[i] = ca.second,b[i] = cb.second;
    }
    for (i = 0; i < C; i++) {
        for (j = 0; j < N; j++) {
            pii p = mp(2*tx[j]-cx[i],2*ty[j]-cy[i]);
            if (ccw(a[j],mp(tx[j],ty[j]),b[j])) {
                if (ccw(mp(tx[j],ty[j]),b[j],p) && ccw(mp(tx[j],ty[j]),p,a[j])) break;
            }
            else {
                if (!ccw(mp(tx[j],ty[j]),a[j],p) || !ccw(mp(tx[j],ty[j]),p,b[j])) break;
            }
        }
        if (j >= N) ans.pb(i);
    }
    printf("%d\n",ans.size());
    for (i = 0; i < ans.size(); i++) printf("%d%c",ans[i]+1,(i == ans.size()-1) ? '\n':' ');

    return 0;
}

Compilation message (stderr)

fangorn.cpp: In function 'int main()':
fangorn.cpp:108:29: warning: format '%d' expects argument of type 'int', but argument 2 has type 'std::vector<int>::size_type {aka long unsigned int}' [-Wformat=]
     printf("%d\n",ans.size());
                   ~~~~~~~~~~^
fangorn.cpp:109:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (i = 0; i < ans.size(); i++) printf("%d%c",ans[i]+1,(i == ans.size()-1) ? '\n':' ');
                 ~~^~~~~~~~~~~~
fangorn.cpp:109:64: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (i = 0; i < ans.size(); i++) printf("%d%c",ans[i]+1,(i == ans.size()-1) ? '\n':' ');
                                                              ~~^~~~~~~~~~~~~~~
fangorn.cpp:75:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%*d %*d %d %d %d",&gx,&gy,&C);
     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
fangorn.cpp:76:34: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     for (i = 0; i < C; i++) scanf("%d %d",&cx[i],&cy[i]);
                             ~~~~~^~~~~~~~~~~~~~~~~~~~~~~
fangorn.cpp:77:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d",&N);
     ~~~~~^~~~~~~~~
fangorn.cpp:78:34: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     for (i = 0; i < N; i++) scanf("%d %d",&tx[i],&ty[i]);
                             ~~~~~^~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 30 / 30
• Subtask 2: 20 / 20
• Subtask 3: 30 / 30
• Subtask 4: 20 / 20