Compilare: user.cpp: In function ‘void read()’: user.cpp:17:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < T ; ++i) ^ user.cpp:23:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < n ; ++i) ^ user.cpp:26:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0 ; j < m; ++j) ^ user.cpp: In function ‘void f1()’: user.cpp:33:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < n; ++i) ^ user.cpp:35:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < m ; ++j){ ^