Compilare: main.cpp: In function 'int main()': main.cpp:37:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("barbar.in" , "r" , stdin); ^ main.cpp:38:41: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("barbar.out" , "w" , stdout); ^ main.cpp:40:30: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d\n" , &n , &m); ^ main.cpp:106:16: warning: 'yf' may be used uninitialized in this function [-Wmaybe-uninitialized] if(d[xf][yf] == 0) ~~~~~~~~^ main.cpp:106:16: warning: 'xf' may be used uninitialized in this function [-Wmaybe-uninitialized] main.cpp:87:27: warning: 'ys' may be used uninitialized in this function [-Wmaybe-uninitialized] d[xs][ys] = drg[xs][ys]; ~~~~~~~~~~^ main.cpp:87:27: warning: 'xs' may be used uninitialized in this function [-Wmaybe-uninitialized]