Compilare: main.cpp: In function 'int main()': main.cpp:50:31: warning: variable 'aux' set but not used [-Wunused-but-set-variable] int n, m, k, l, i, j, aux ; ^~~ main.cpp:51:51: 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:55:54: 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:56:51: 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]) ; ^