Submission #147439

#	Time	Username	Problem	Language	Result	Execution time	Memory
147439		username	Virus Experiment (JOI19_virus)	C++14	100 / 100	222 ms	14072 KiB

virus

#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 dx[4] = {-1,0,1,0};
int dy[4] = {0,-1,0,1};
char D[200000];
int U[800][800];
int tt[16];
int parent[640000];
int find(int n) {
    if (parent[n] != n) parent[n] = find(parent[n]);
    return parent[n];
}
int done[640000];
queue<pii> Q;
int visited[800][800];
int main() {
    int i,j;
    int M,R,C;
    scanf("%d %d %d",&M,&R,&C);
    for (i = 0; i < M; i++) scanf(" %c",&D[i]),D[i+M] = D[i];
    for (i = 0; i < R; i++) {
        for (j = 0; j < C; j++) scanf("%d",&U[i][j]);
    }
 
    for (i = 1; i < 16; i++) {
        int p = -1;
        for (j = 0; j < 2*M; j++) {
            int yes;
            if (D[j] == 'W') yes = (i & 1);
            else if (D[j] == 'N') yes = (i & 2);
            else if (D[j] == 'E') yes = (i & 4);
            else yes = (i & 8);
            if (yes) tt[i] = max(tt[i],j-p);
            else p = j;
        }
        if (tt[i] >= M) tt[i] = 100001;
    }
    int k,l,f = 1,t = 0;
    int best = R*C+1,num = 1;
    for (i = 0; i < R*C; i++) parent[i] = i;
    while (f) {
        f = 0;
        for (i = 0; i < R; i++) {
            for (j = 0; j < C; j++) {
                if ((U[i][j] > 0) && !done[i*C+j] && (find(i*C+j) == i*C+j)) {
                    int c = 0,mx = -1,my = -1;
                    visited[i][j] = ++t,Q.push(mp(i,j));
                    while (!Q.empty()) {
                        int x = Q.front().second,y = Q.front().first;
                        Q.pop(),c++;
 
                        for (k = 0; k < 4; k++) {
                            int xx = x+dx[k],yy = y+dy[k];
                            if ((xx >= 0) && (xx < C) && (yy >= 0) && (yy < R) && (visited[yy][xx] != t) && (U[yy][xx] > 0)) {
                                int m = 0;
                                for (l = 0; l < 4; l++) {
                                    int x2 = xx+dx[l],y2 = yy+dy[l];
                                    if ((x2 >= 0) && (x2 < C) && (y2 >= 0) && (y2 < R) && (visited[y2][x2] == t)) m |= (1 << l);
                                }
                                if (tt[m] >= U[yy][xx]) {
                                    if (find(yy*C+xx) != i*C+j) mx = xx,my = yy;
                                    visited[yy][xx] = t;
                                    Q.push(mp(yy,xx));
                                    if(mx != -1)break;
                                }
                            }
                        }
                        if (mx != -1) break;
                    }
                    while (!Q.empty()) Q.pop();
                    if (mx == -1) {
                        if (c < best) best = num = c;
                        else if (c == best) num += c;
                        done[i*C+j] = 1;
                    }
//                    else if (done[find(my*C+mx)]) done[i*C+j] = 1;
                    else parent[i*C+j] = find(my*C+mx);
                    f = 1;
                }
            }
        }
    }
    printf("%d\n%d\n",best,num);
 
    return 0;
}

Compilation message (stderr)

virus.cpp: In function 'int main()':
virus.cpp:74:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d %d",&M,&R,&C);
     ~~~~~^~~~~~~~~~~~~~~~~~~~~
virus.cpp:75:47: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     for (i = 0; i < M; i++) scanf(" %c",&D[i]),D[i+M] = D[i];
                             ~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~
virus.cpp:77:38: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         for (j = 0; j < C; j++) scanf("%d",&U[i][j]);
                                 ~~~~~^~~~~~~~~~~~~~~

• Subtask 1: 14 / 14
• Subtask 2: 6 / 6
• Subtask 3: 80 / 80