Compilare: main.cpp:16:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type] main() ^ main.cpp: In function 'int main()': main.cpp:21:14: warning: suggest parentheses around '+' inside '>>' [-Wparentheses] cin >> a + 1 >> b + 1; ~~^~~ main.cpp:21:23: warning: suggest parentheses around '+' inside '>>' [-Wparentheses] cin >> a + 1 >> b + 1; ~~^~~ main.cpp:32:28: warning: suggest parentheses around assignment used as truth value [-Wparentheses] if (a[k + 1] = a[i]) ^ main.cpp:18:32: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen(input, "rt", stdin); ^ main.cpp:19:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen(output, "wt", stdout); ^