Submission #70191

#	Time	Username	Problem	Language	Result	Execution time	Memory
70191		3zp	Dango Maker (JOI18_dango_maker)	C++14	13 / 100	3 ms	876 KiB

dango_maker

#include<bits/stdc++.h>
#define maxn 500009
using namespace std;
string s[3009];
bool A[3009][3009];
bool B[3009][3009];
int a[3009][3009];
int b[3009][3009];
int k, ans;
int p[6000009], s1[6000009], s2[6000009];
int par(int x){
    if(p[x] != x)
        p[x] = par(p[x]);
    return p[x];
}
void un(int x, int y){
    x = par(x);
    y = par(y);
    if(x == y) return;
    if(s1[x] + s2[x] > s1[y] + s2[y]) swap(x,y);
    p[x] = y;
    ans += max(s1[x]+s1[y], s2[x]+s2[y]) -max(s1[x], s2[x]) -max(s1[y],s2[y]);
    s1[y] += s1[x];
    s2[y] += s2[x];
}
main(){
    int n, m;
    cin >> n >> m;
    for(int i = 0; i < n; i++){
        cin >> s[i];
    }
    for(int i = 0; i < n; i++){
        for(int j = 0; j < m; j++){
            if(j + 2 < m && s[i][j] == 'R'
                         && s[i][j+1] == 'G'
                         && s[i][j+2] == 'W')
            A[i][j] = 1, a[i][j] = ++k, p[k] = k, s1[k] =1, s2[k] =0, ans++;
            if(i + 2 < n && s[i][j] == 'R'
                         && s[i+1][j] == 'G'
                         && s[i+2][j] == 'W')
            B[i][j] = 1, b[i][j] = ++k, p[k] = k, s1[k] =0, s2[k] =1, ans++;
        }
    }
    for(int i = 0; i < n; i++){
        for(int j = 0; j < m; j++){
            if(A[i][j])
            {  if (i >= 1 && B[i-1][j+1])
                {
                   un(a[i][j], b[i-1][j+1]);
                }
               if(i >= 2 && B[i-2][j+2]){
                   un(a[i][j], b[i-2][j+2]);
               }
               if(B[i][j]){
                    un(a[i][j], b[i][j]);
               }
            }
        }
    }
    cout << ans << endl;

}

Compilation message (stderr)

dango_maker.cpp:26:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
 main(){
      ^

• Subtask 1: 13 / 13
• Subtask 2: 0 / 20
• Subtask 3: 0 / 67