Create 5883_yyecust.cpp

From http://blog.csdn.net/yyecust/article/details/52565788

HDOJ/5883_yyecust.cpp

@@ -0,0 +1,59 @@
+#include <iostream>
+#include <cstdio>
+using namespace std;
+const int MAXN = 100000;
+int g[MAXN]; //g[i]表示与i相连的边数
+int a[MAXN];
+void solve()
+{
+  int n, m;
+  scanf("%d%d", &n, &m);
+  for (int i = 0; i < n; i++) {
+    scanf("%d", &a[i]);
+    g[i] = 0;
+  }
+  for (int i = 0; i < m; i++) {
+    int u, v;
+    scanf("%d%d", &u, &v);
+    u--;
+    v--;
+    g[u]++;
+    g[v]++;
+  }
+  int ods = 0; //奇点数
+  int xors = 0;
+  for (int i = 0; i < n; i++) {
+    if (g[i] % 2) {
+      ods++;
+      if (g[i] % 3) {
+        xors ^= a[i];
+      }
+    } else {
+      if (g[i] % 4) {
+        xors ^= a[i];
+      }
+    }
+  }
+  if (ods > 2) {
+    puts("Impossible");
+    return;
+  }
+  if (ods == 2) {
+    printf("%d\n", xors);
+    return;
+  }
+  int ans = 0;
+  for (int i = 0; i < n; i++) {
+    ans = max(ans, xors ^ a[i]);
+  }
+  printf("%d\n", ans);
+}
+int main()
+{
+  //freopen("in.txt", "r", stdin);
+  int t;
+  scanf("%d", &t);
+  while (t--) {
+    solve();
+  }
+}