Compilare: main.cpp: In function 'int main()': main.cpp:53:19: warning: variable 'aux' set but not used [-Wunused-but-set-variable] int k, l, i, j, aux ; ^~~ main.cpp:54:47: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf ( in, "%d %d %d %d", &n, &m, &k, &l ) ; ^ main.cpp:63:37: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf ( in, "%d", &mat[i][j] ) ; ^ main.cpp:64:41: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] else fscanf ( in, "%d", &mat[j][i] ) ; ^