Compilare: main.cpp: In function 'int main()': main.cpp:40:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("alpin.in","r",stdin); ^ main.cpp:41:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("alpin.out","w",stdout); ^ main.cpp:43:19: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ main.cpp:47:33: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&v[i][j]); ^ main.cpp:77:28: warning: 'y' may be used uninitialized in this function [-Wmaybe-uninitialized] int newy=y+dy[j]; ^ main.cpp:76:28: warning: 'x' may be used uninitialized in this function [-Wmaybe-uninitialized] int newx=x+dx[j]; ^