Compilare: user.cpp: In function ‘int main()’: user.cpp:146:50: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(max_arie_2 < v[mat[i][j+1]] + v[mat[i+1][j]] + v[mat[i][j-1]] + 1 ){ ^ user.cpp:146:67: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(max_arie_2 < v[mat[i][j+1]] + v[mat[i+1][j]] + v[mat[i][j-1]] + 1 ){ ^ user.cpp:146:84: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(max_arie_2 < v[mat[i][j+1]] + v[mat[i+1][j]] + v[mat[i][j-1]] + 1 ){ ^ user.cpp:51:33: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &varianta); ^ user.cpp:53:33: 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:56:38: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%s", mat[i] + 1); ^ user.cpp:209:45: warning: ‘c’ may be used uninitialized in this function [-Wmaybe-uninitialized] fprintf(fout, "%d %d\n%c", i2, j2, c); ^