alice.cpp: In function 'int comp(int&)': alice.cpp:20: warning: no return statement in function returning non-void alice.cpp: In function 'int main()': alice.cpp:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result alice.cpp:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result alice.cpp:42: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result alice.cpp:44: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result alice.cpp: In function 'int verif(int)': alice.cpp:37: warning: control reaches end of non-void function