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AtCoder/abc390/C_Paint_to_make_a_rectangle.cpp

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+#include <bits/stdc++.h>
+#define lo long long
+#define INF INT_MAX
+#define LLM LONG_LONG_MAX
+
+using namespace std;
+const int N = 1e7 + 10;
+/*
+    toothless. #17
+    @fredcss_dev
+*/
+
+bool f(int h, int w, vector<string>& g)
+{
+    int top = h, b = -1, l = w, r = -1;
+    for (int i = 0; i < h; i++) {
+        for (int j = 0; j < w; j++) {
+            if (g[i][j] == '#') {
+                top = min(top, i);
+                b = max(b, i);
+                l = min(l, j);
+                r = max(r, j);
+            }
+        }
+    }
+    if (b == -1) return true;
+    for (int i = top; i <= b; i++) {
+        for (int j = l; j <= r; j++) {
+            if (g[i][j] == '.') return false;
+        }
+    }
+    for (int i = 0; i < h; i++) {
+        for (int j = 0; j < w; j++) {
+            if (i < top || i > b || j < l || j > r) {
+                if (g[i][j] == '#') return false;
+            }
+        }
+    }
+    return true;
+}
+
+signed main()
+{
+    int h, w;
+    cin >> h >> w;
+    if (h == 1 && w == 1) {
+        puts("Yes");
+        return 0;
+    }
+    vector<string> g(h);
+    for (int i = 0; i < h; i++) {
+        cin >> g[i];
+    }
+    if (f(h, w, g)) {
+        cout << "Yes" << endl;
+    } else {
+        cout << "No" << endl;
+    }
+    return 0;
+}