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4 - Graph/Graph Traversal/FloodFill-Finding Connected Components/UVa-352-The-Seasonal-War.cpp

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+#include "bits/stdc++.h"
+
+using namespace std;
+
+const int dx[] = { 1, -1, 0, 0, 1, 1, -1, -1 };
+const int dy[] = { 0, 0, 1, -1, 1, -1, 1, -1 };
+const char dir[] = {'D', 'U', 'R', 'L'};
+
+void Fast() { cin.sync_with_stdio(0); cin.tie(0); cout.tie(0); }
+void File()
+{
+    #ifndef ONLINE_JUDGE
+    freopen("input.in", "r", stdin);
+    //freopen("output.out", "w", stdout);
+    #endif
+}
+
+/**----------------->>  Quality Over Quantity  <<----------------**/
+
+int n, CCs;
+char grid[30][30];
+
+bool valid(int r, int c)
+{
+    return r >= 0 && r < n && c >= 0 && c < n && grid[r][c] == '1';
+}
+
+void BFS(int sr, int sc)
+{
+    queue < array <int, 2> > Q;
+    Q.push({sr, sc});
+    grid[sr][sc] = 0;
+
+    array <int, 2> cell;
+    int r, c;
+
+    while(Q.size())
+    {
+        cell = Q.front(); Q.pop();
+        for(int i = 0; i < 8; ++i)
+        {
+            r = cell[0] + dx[i];
+            c = cell[1] + dy[i];
+
+            if(!valid(r, c)) continue;
+            grid[r][c] = '0';
+            Q.push({r, c});
+        }
+    }
+}
+
+void Solve()
+{
+    for(int i = 0; i < n; ++i)
+    for(int j = 0; j < n; ++j)
+        cin >> grid[i][j];
+
+    for(int i = 0; i < n; ++i)
+    for(int j = 0; j < n; ++j)
+        if(grid[i][j] == '1') BFS(i, j), ++CCs;
+}
+
+void MultiTest(bool Tests = 0)
+{
+    int tc = 1; (Tests) && (cin >> tc);
+    for(int i = 1; cin >> n; ++i)
+    {
+        CCs = 0;
+        Solve();
+        cout << "Image number " << i << " contains " << CCs << " war eagles." << endl;
+    }
+}
+
+/**------------------------->>  Main  <<-------------------------**/
+
+int main()
+{
+    Fast(); File(); MultiTest();
+}