matricea.cpp: In function 'void solve(int, int)': matricea.cpp:10: warning: unused variable 'j' matricea.cpp: In function 'int main()': matricea.cpp:72: warning: unused variable 'j' matricea.cpp:73: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result matricea.cpp:74: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result matricea.cpp:75: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result matricea.cpp:77: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result matricea.cpp:79: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result