Compilare: user.cpp: In function ‘void debugMode()’: user.cpp:15:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ratina.in", "r", stdin); ^ user.cpp:16:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ratina.out", "w", stdout); ^ user.cpp: In function ‘int main()’: user.cpp:61:11: warning: ‘rs’ may be used uninitialized in this function [-Wmaybe-uninitialized] cout << rs << "\n"; ^