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Algorithm/DS-Related/Graph/DFS/UVa10603-Fill.cpp

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+#include <iostream>
+#include <vector>
+#include <set>
+#include <bits/stdc++.h>
+using namespace std;
+
+bool have = false;
+set<tuple<int,int,int>> visited;
+
+int A, B, C; // <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
+
+void dfs(int a, int b, int c, int target) {
+    if (a == target || b == target || c == target) {
+        have = true;
+        return;
+    }
+
+    auto state = make_tuple(a, b, c);
+    if (visited.find(state) != visited.end()) return;
+    visited.insert(state);
+
+    // <20><><EFBFBD>ֵ<EFBFBD>ˮ<EFBFBD><CBAE><EFBFBD><EFBFBD>
+    // a -> b
+    {
+        int pour = min(a, B - b);
+        dfs(a - pour, b + pour, c, target);
+    }
+    // a -> c
+    {
+        int pour = min(a, C - c);
+        dfs(a - pour, b, c + pour, target);
+    }
+    // b -> a
+    {
+        int pour = min(b, A - a);
+        dfs(a + pour, b - pour, c, target);
+    }
+    // b -> c
+    {
+        int pour = min(b, C - c);
+        dfs(a, b - pour, c + pour, target);
+    }
+    // c -> a
+    {
+        int pour = min(c, A - a);
+        dfs(a + pour, b, c - pour, target);
+    }
+    // c -> b
+    {
+        int pour = min(c, B - b);
+        dfs(a, b + pour, c - pour, target);
+    }
+}
+
+int main() {
+    int target;
+    cin >> A >> B >> C >> target;
+    dfs(A, 0, 0, target); // <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʼ<EFBFBD><CABC> A װ<><D7B0>
+    if (have) cout << "YES" << endl;
+    else cout << "NO" << endl;
+    return 0;
+}
+