pestera.cpp: In function 'void read()': pestera.cpp:86: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result pestera.cpp:89: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result pestera.cpp:98: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result pestera.cpp: In function 'int isVertexDelay(int, int)': pestera.cpp:144: warning: comparison between signed and unsigned integer expressions pestera.cpp:146: warning: comparison between signed and unsigned integer expressions pestera.cpp: In function 'int findEdgeDelay(int, int, int, int, int)': pestera.cpp:163: warning: comparison between signed and unsigned integer expressions pestera.cpp:167: warning: comparison between signed and unsigned integer expressions pestera.cpp: In function 'int main()': pestera.cpp:251: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result pestera.cpp:252: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result