Compilare: main.cpp: In function 'int main()': main.cpp:62:11: warning: suggest explicit braces to avoid ambiguous 'else' [-Wparentheses] if(!a[x[i]][y[i]]) ^ main.cpp:42:13: warning: unused variable 'semn' [-Wunused-variable] int i,j,semn; ^~~~ main.cpp:43:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("snake.in","r",stdin); ^ main.cpp:44:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("snake.out","w",stdout); ^ main.cpp:45:29: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&n,&m,&l); ^ main.cpp:49:33: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&a[i][j]); ^