Compilare: main.cpp: In function 'void read(FILE*, int (*)[16], int, int)': main.cpp:11:7: warning: unused variable 'c' [-Wunused-variable] char c = 0; ^ main.cpp:15:30: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &a[i][j]); ^ main.cpp: In function 'int main()': main.cpp:76:28: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d%d", &n, &m); ^