conferinta.cpp: In function 'bool ok(int)': conferinta.cpp:7: warning: unused variable 'j' conferinta.cpp: In function 'int main()': conferinta.cpp:26: warning: unused variable 'j' conferinta.cpp:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result conferinta.cpp:25: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result conferinta.cpp:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result conferinta.cpp:33: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result conferinta.cpp: In function 'bool ok(int)': conferinta.cpp:21: warning: control reaches end of non-void function conferinta.cpp: In function 'int main()': conferinta.cpp:37: warning: 'l' may be used uninitialized in this function