Compilare: main.cpp: In function 'int main()': main.cpp:34:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("trenbus.in", "r", stdin); ^ main.cpp:35:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("trenbus.out", "w", stdout); ^ main.cpp:72:10: warning: 'sol' may be used uninitialized in this function [-Wmaybe-uninitialized] sol += cnt; } } } ~~~~^~~~~~