Compilare: user.cpp: In function ‘int total(int, int)’: user.cpp:9:16: warning: unused variable ‘j’ [-Wunused-variable] int suma, i, j; ^ user.cpp: In function ‘int main()’: user.cpp:40:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d", &n, &m); ^ user.cpp:44:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &A[i][j]); ^