Compilare: user.cpp: In function ‘int main()’: user.cpp:30:9: warning: unused variable ‘aux’ [-Wunused-variable] int aux, sol1,sol2,mare=999999; ^~~ user.cpp:30:14: warning: unused variable ‘sol1’ [-Wunused-variable] int aux, sol1,sol2,mare=999999; ^~~~ user.cpp:30:19: warning: unused variable ‘sol2’ [-Wunused-variable] int aux, sol1,sol2,mare=999999; ^~~~ user.cpp:30:24: warning: unused variable ‘mare’ [-Wunused-variable] int aux, sol1,sol2,mare=999999; ^~~~ user.cpp: In function ‘void read()’: user.cpp:8:22: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&n); ^ user.cpp:11:36: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&C[i][j]); ^ user.cpp: In function ‘void roy_floyd()’: user.cpp:22:41: warning: ‘j’ may be used uninitialized in this function [-Wmaybe-uninitialized] tata[i][j] = tata[k][j]; ~~~~~~~~~^ user.cpp:21:35: warning: ‘i’ may be used uninitialized in this function [-Wmaybe-uninitialized] C[i][j] = C[i][k]+C[k][j]; ~~~~~~^