Submission #1057291

#	Time	Username	Problem	Language	Result	Execution time	Memory
1057291		Nickpapadak	Game (eJOI20_game)	C++14	20 / 100	0 ms	348 KiB

game

#include<bits/stdc++.h>
using namespace std;
#define X first
#define Y second

const unsigned int MAXN = (int)2e+1 + 5;
const unsigned int MAXMN = 410;

int grid[MAXN][MAXN];
int N, M;
int cnt;
int p[MAXMN];
int sz[MAXMN];
int CI(int x, int y) {return (y-1)*M + x;}
pair<int,int> IC(int id) {return {(id-1)%M +1, ((id-1)/M)+1};}
int findp(int u){
    if(p[u] == u) return u;
    return p[u] = findp(p[u]);
}

void Union(int u, int v){
    if(findp(v) == findp(u)) return;
    if(sz[findp(v)] > sz[findp(u)]) swap(u,v);
    sz[findp(u)] += sz[findp(v)];
    // int x = findp(u), y = findp(v);
    //  printf("%d\n", findp(v));
    // p[2]= 1;
    p[findp(v)] = findp(u);
   
}
void Join(int x, int y, int dx, int dy){
    // printf("\n\n%d %d\n\n", x, y);
    if(x < 1 || x > M || y < 0 || y > N) return;
    if(dx < 1 || dx > M || dy < 0 || dy > N) return;
    Union(CI(x,y), CI(dx,dy));
}

int main(){
    scanf("%d%d", &N, &M);
    for(int i = 1; i<= N*M; ++i){
        p[i] = i;
        sz[i] = 1;
    }
    char ps[M];
    scanf("%s", ps);
    for(int i = 1; i<=N; ++i){
        char s[M];
        scanf("%s", s);
        for(int j = 1; j <=M;++j){
            grid[i][j] = (ps[j-1]-'0') + (s[j-1]-'0');
            if(s[j-1]-'0' == 0) Join(j, i, j, i+1);
        }
        for(int j = 0; j<M;++j){
            ps[j] = s[j];
        }
    }

    for(int i = 1; i<=N; ++i){
        char s[M+1];
        scanf("%s", s);
        for(int j = 1; j<=M; ++j){
            grid[i][j] += (s[j] -'0') + (s[j-1] - '0');
            if(s[j-1] == '0') Join(j, i, j-1, i);
            if(grid[i][j] == 4) cnt++;
        }
    }
    int f = 0, s = 0;
    bool onlytwo = true;
    for(int i = 1; i<=M*N;++i){
        if(grid[IC(i).Y][IC(i).X] == 4) continue;
        if(f==0)f = findp(i);
        else if(s==0 && f != findp(i)) s= findp(i);
        else if(findp(i) != s && findp(i) != f) onlytwo = false;
    }
    if(onlytwo && s == 0){
        printf("%d", -sz[f]);
    }
    else if(onlytwo){
         if(sz[findp(f)] > 1 && sz[findp(s)] > 1) printf("%d", 2 - (sz[findp(f)]+sz[findp(s)]-2));
    else if(sz[findp(f)] ==1 && sz[findp(s)] > 1) printf("%d", (sz[findp(s)]) - 1);
    else if(sz[findp(s)] ==1 && sz[findp(f)] > 1) printf("%d", (sz[findp(f)]) - 1);
    else                                          printf("0");
    }
    else
    // for(int i = 1; i<=N;++i){
    //     for(int j = 1; j <=M;++j){
    //         printf("%d ", grid[i][j]);
    //     }
    //     printf("\n");
    // }
    return 0;
}

Compilation message (stderr)

game.cpp: In function 'int main()':
game.cpp:39:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   39 |     scanf("%d%d", &N, &M);
      |     ~~~~~^~~~~~~~~~~~~~~~
game.cpp:45:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   45 |     scanf("%s", ps);
      |     ~~~~~^~~~~~~~~~
game.cpp:48:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   48 |         scanf("%s", s);
      |         ~~~~~^~~~~~~~~
game.cpp:60:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   60 |         scanf("%s", s);
      |         ~~~~~^~~~~~~~~

• Subtask 1: 20 / 20
• Subtask 2: 0 / 20
• Subtask 3: 0 / 20
• Subtask 4: 0 / 20
• Subtask 5: 0 / 20