lbd.cpp: In function 'void readMatrix()': lbd.cpp:23: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result lbd.cpp:30: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result lbd.cpp:34: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result lbd.cpp: In function 'bool hasIceAround(int, int)': lbd.cpp:57: warning: comparison between signed and unsigned integer expressions lbd.cpp: In function 'void addIceIntoQueue(int, int)': lbd.cpp:72: warning: comparison between signed and unsigned integer expressions lbd.cpp: In function 'bool way()': lbd.cpp:115: warning: comparison between signed and unsigned integer expressions lbd.cpp: In function 'void meltIce()': lbd.cpp:157: warning: comparison between signed and unsigned integer expressions