Compilare: main.cpp: In function 'int main()': main.cpp:79:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("input", "r", stdin); ^ main.cpp:80:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("output", "w", stdout); ^ main.cpp:82:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] files(FILENAME); ^ main.cpp:82:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] main.cpp: In function 'void solve_test()': main.cpp:62:32: warning: 'id' may be used uninitialized in this function [-Wmaybe-uninitialized] c = slay[id].second, i = slay[id].first; ~~^~~~~~~~~~~~~~~~