#include<bits/stdc++.h>
using namespace std;
#define pi pair<int, int>
char a[1015][1015];
int dx[] = {0, 0, 0, 1, -1, -1, 1, 1, -1};
int dy[] = {0, 1, -1, 0, 0, -1, -1, 1, 1};
int bear[1105][1015], bee[1105][1015], xx = -1, yy = -1, xxx = -1, yyy = -1, n, kk;
bool asdasd = 0;
bool can(int k) {
if ( k >= bee[xx][yy] ) return 0;
for ( int i = 1; i <= n; i++ )
for ( int j = 1; j <= n; j++ )
bear[i][j] = INT_MAX;
bear[xx][yy] = 0;
queue < pi > q;
q.push(make_pair(xx, yy));
int x, y;
while(!q.empty()) {
tie(x, y) = q.front();
q.pop();
for(int i = 1; i <= 4; i++) {
int x1 = x + dx[i], y1 = y + dy[i];
if ( a[x1][y1] == 'D' ) {asdasd = 1; return 1;}
if ( a[x1][y1] == 'G' && bear[x][y] + 1 < kk * ( bee[x1][y1] - k ) && bear[x1][y1] == INT_MAX ) {
bear[x1][y1] = bear[x][y] + 1;
q.push ( make_pair ( x1, y1 ) );
}
}
}
return 0;
}
int main() {
cin >> n >> kk;
queue < pi > p;
for(int i = 1; i <= n; i++) {
for(int j = 1; j <= n; j++) {
bee[i][j] = INT_MAX;
cin >>a[i][j];
if ( a[i][j] == 'H' ) {p.push(make_pair(i, j)); bee[i][j] = 0;}
if ( a[i][j] == 'M' ) xx = i, yy = j;
}
}
while(!p.empty()) {
int x, y; tie(x, y) = p.front(); p.pop();
for ( int i = 1; i <= 4; i++ ) {
int x1 = x + dx[i], y1 = y + dy[i];
if ( bee[x1][y1] == INT_MAX && ( a[x1][y1] == 'G' || a[x1][y1] == 'M' ) ) {
bee[x1][y1] = bee[x][y] + 1; p.push ( make_pair ( x1, y1 ) );
}
}
}
int k = 0, mm = n * n;
for(int i = mm/2; i >= 1; i /= 2)
while(i + k <= mm && can(i+k))
k += i;
bool p = can(0);
if ( !asdasd ) cout << -1;
else cout << k;
}
Compilation message
mecho.cpp: In function 'int main()':
mecho.cpp:68:10: error: conflicting declaration 'bool p'
bool p = can(0);
^
mecho.cpp:43:18: note: previous declaration as 'std::queue<std::pair<int, int> > p'
queue < pi > p;
^
