alpinist.cpp: In function 'void read()': alpinist.cpp:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result alpinist.cpp:41: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result alpinist.cpp:44: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result alpinist.cpp: In function 'void write()': alpinist.cpp:141: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result alpinist.cpp: In function 'void solve()': alpinist.cpp:50: warning: 'x' may be used uninitialized in this function alpinist.cpp:50: warning: 'y' may be used uninitialized in this function