add PUCMM334

pucmm334.cpp

@@ -0,0 +1,43 @@
+// 2016-04-29
+// stupid problem doesn't allow C++11 :(
+#include <iostream>
+#include <vector>
+#include <algorithm>
+using namespace std;
+int main() {
+    int N; cin >> N;
+    int m = 1e9, M = -1;
+    vector<int> v(N);
+    for (int i = 0; i < N; i++) {
+        cin >> v[i];
+        m = min(m, v[i]);
+        M = max(M, v[i]);
+    }
+    int res;
+    if (m == M) {
+        if (m == 0) {
+            res = 0;
+        } else if (m == N-1) {
+            res = N;
+        } else {
+            res = -1;
+        }
+    } else if (M - m > 1) {
+        res = -1;
+    } else {
+        if (M >= 1 && M < N) {
+            int nM = 0;
+            for (int i = 0; i < N; i++) {
+                if (v[i] == M) nM++;
+            }
+            if (M + nM == N) {
+                res = M;
+            } else {
+                res = -1;
+            }
+        } else {
+            res = -1;
+        }
+    }
+    cout << res << "\n";
+}