Compilare: main.cpp: In lambda function: main.cpp:92:34: warning: statement has no effect [-Wunused-value] if(cnt) debug(i, cnt); ^ main.cpp:96:26: warning: statement has no effect [-Wunused-value] debug(c, cnt); ^ main.cpp: In function 'void usaco_io(const string&)': main.cpp:49:45: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen((s + ".in").c_str(), "r", stdin); ^ main.cpp:50:47: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen((s + ".out").c_str(), "w", stdout); ^