Compilare: main.cpp: In function 'int main()': main.cpp:53:28: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf( fin, "%d\n", &n ); ^ main.cpp:56:36: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf( fin, "%d", &a[i][j] ); ^ main.cpp:75:19: warning: 'y' may be used uninitialized in this function [-Wmaybe-uninitialized] write_road(x, y); ^ main.cpp:75:19: warning: 'x' may be used uninitialized in this function [-Wmaybe-uninitialized]