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POProblem with erasing elements from the set
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copied!<p>I am having troubles with erasing elements from sets. I get <code>BUILD FAILED</code> from:</p> <pre><code>n2Ar.erase(it); n3Ar.erase(it); </code></pre> <p>where <code>it</code> is a pointer received from <code>find()</code> function: e.g. <code>it = n2Ar.find(*i);</code></p> <p>The whole listing of the program:</p> <pre><code>#include <stdio.h> #include <iostream> #include <vector> #include <set> #include <algorithm> using namespace std; #define TESTING_FILE_IN //#define TESTING_FILE_OUT //#define DEBUG //#define SHOW_TIMING int outputSet(int i) { cout << i << endl; } /* * */ int main() { int n1, n2, n3; set<int> list, n1Ar, n2Ar, n3Ar; set<int>::iterator it; scanf("%d", &n1); scanf("%d", &n2); scanf("%d", &n3); int val = 0; // Getting lists of voters for (unsigned i = 0; i < n1; i++) { cin >> val; n1Ar.insert(val); } for (unsigned i = 0; i < n2; i++) { cin >> val; n2Ar.insert(val); } for (unsigned i = 0; i < n3; i++) { cin >> val; n3Ar.insert(val); } // Processing lists for (set<int>::iterator i = n1Ar.begin(); i != n1Ar.end(); ++i) { it = n2Ar.find(*i); if (it != n2Ar.end()) { list.insert(*i); n1Ar.erase(i); n2Ar.erase(it); } else { it = n3Ar.find(*i); if (it != n3Ar.end()) { list.insert(*i); n1Ar.erase(i); n3Ar.erase(it); } } } // Outputting the final list cout << list.size() << endl; for_each(list.begin(), list.end(), outputSet); return 0; } </code></pre> <p>I hope you'll be able to help me understand what I am doing wrong in here. I am only starting with C++.</p>

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