Submission #81911

#	Time	Username	Problem	Language	Result	Execution time	Memory
81911		duality	Sailing Race (CEOI12_race)	C++11	70 / 100	3052 ms	5652 KiB

race

#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 ----------

int adjMat[500][500];
int dp[500][500][2],dp2[500][500][2];
int main() {
    int i;
    int N,K,x;
    scanf("%d %d",&N,&K);
    for (i = 0; i < N; i++) {
        while (1) {
            scanf("%d",&x),x--;
            if (x == -1) break;
            else adjMat[i][x] = 1;
        }
    }

    int j,k,l;
    for (i = 2; i <= N; i++) {
        for (j = 0; j < N; j++) {
            k = (j+i-1) % N;
            for (l = (j+1) % N; l != k; l++,l %= N) {
                if (adjMat[j][l]) dp[j][k][0] = max(dp[j][k][0],max(dp[j][l][1],dp[l][k][0])+1);
                if (adjMat[k][l]) dp[j][k][1] = max(dp[j][k][1],max(dp[j][l][1],dp[l][k][0])+1);
            }
        }
    }
    for (i = 2; i <= N; i++) {
        for (j = 0; j < N; j++) {
            k = (j+i-1) % N;
            dp2[j][k][0] = dp2[j][k][1] = -9999;
            if (adjMat[j][k]) dp2[j][k][0] = 1;
            if (adjMat[k][j]) dp2[j][k][1] = 1;
            for (l = (j+1) % N; l != k; l++,l %= N) {
                if (adjMat[j][l]) dp2[j][k][0] = max(dp2[j][k][0],dp2[l][k][0]+1);
                if (adjMat[k][l]) dp2[j][k][1] = max(dp2[j][k][1],dp2[j][l][1]+1);
            }
        }
    }
    if (K == 0) {
        int M = -1,p = -1;
        for (i = 0; i < N; i++) {
            for (j = 0; j < N; j++) {
                if ((i != j) && adjMat[i][j]) {
                    if ((dp[i][j][1] > M) || (dp[j][i][0] > M)) M = max(dp[i][j][1],dp[j][i][0]),p = i;
                }
            }
        }
        printf("%d\n%d\n",M+1,p+1);
    }
    else {
        int M = -1,p = -1;
        for (i = 0; i < N; i++) {
            for (j = 0; j < N; j++) {
                if ((i != j) && adjMat[i][j]) {
                    if ((max(dp[i][j][1],dp[j][i][0])+1) > M) M = max(dp[i][j][1],dp[j][i][0])+1,p = i;
                }
            }
        }
        for (i = 0; i < N; i++) {
            for (j = 0; j < N; j++) {
                if ((i == j) || !adjMat[i][j]) continue;
                for (k = (i+1) % N; k != j; k++,k %= N) {
                    for (l = (j+1) % N; l != i; l++,l %= N) {
                        if (adjMat[k][l]) {
                            if ((dp2[k][j][1]+max(dp[l][i][0],dp[j][l][1])+2) > M) M = dp2[k][j][1]+max(dp[l][i][0],dp[j][l][1])+2,p = i;
                            if ((dp2[j][l][0]+max(dp[k][j][0],dp[i][k][1])+2) > M) M = dp2[j][l][0]+max(dp[k][j][0],dp[i][k][1])+2,p = i;
                        }
                    }
                }
            }
        }
        printf("%d\n%d\n",M,p+1);
    }

    return 0;
}

Compilation message (stderr)

race.cpp: In function 'int main()':
race.cpp:63:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d",&N,&K);
     ~~~~~^~~~~~~~~~~~~~~
race.cpp:66:27: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
             scanf("%d",&x),x--;
             ~~~~~~~~~~~~~~^~~~

• Subtask 1: 70 / 100