Submission #96206

#	Time	Username	Problem	Language	Result	Execution time	Memory
96206		JaeyunK	문명 (KOI17_civilization)	C++11	100 / 100	930 ms	42640 KiB

civilization

#include <cstdio>
#include <queue>
#include <algorithm>
using namespace std;
class data{
public:
    int x, y, rk;
    data(){}
    data(int _x, int _y, int _r):x(_x),y(_y),rk(_r){}
};
int arr[2005][2005], rarr[2005][2005], par[100010], psz[100010], pos[2][4] = {{0, 0, 1, -1}, {1, -1, 0, 0}};
queue<data> que;
 
int getPar(int x){
    if(par[x] == x) return x;
    return par[x] = getPar(par[x]);
}
 
int main(){
    int n, k, a, b;
    scanf("%d %d", &n, &k);
    for(int i=1; i<=k; i++){
        scanf("%d %d", &a, &b);
        par[i] = i;
        psz[i] = 1;
        arr[a][b] = i;
        rarr[a][b] = 1;
        que.push({a, b, 1});
    }
    while(!que.empty()){
        int x = que.front().x, y = que.front().y, rk = que.front().rk;
        que.pop();
        for(int i=0; i<4; i++){
            int X = x+pos[0][i], Y = y+pos[1][i];
            if(X < 1 || X > n || Y < 1 || Y > n) continue;
            if(rarr[X][Y] == 0){
                arr[X][Y] = arr[x][y];
                rarr[X][Y] = rk+1;
                que.push({X, Y, rk+1});
            }else{
                int t = getPar(arr[X][Y]), p = getPar(arr[x][y]);
                if(t != p){
                    int sz = psz[t] + psz[p];
                    par[t] = p;
                    psz[p] += psz[t];
                    psz[t] = 0;
                    if(sz == k){
			long long ans = max(rarr[X][Y], rarr[x][y])-1;
                        printf("%lld", ans);
                        return 0;
                    }
                }
            }
        }
    }
    return 0;
}

Compilation message (stderr)

civilization.cpp: In function 'int main()':
civilization.cpp:21:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d", &n, &k);
     ~~~~~^~~~~~~~~~~~~~~~~
civilization.cpp:23:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d %d", &a, &b);
         ~~~~~^~~~~~~~~~~~~~~~~

• Subtask 1: 19 / 19
• Subtask 2: 35 / 35
• Subtask 3: 46 / 46