Compilare: user.cpp: In function ‘int main()’: user.cpp:59:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("vis.in","r",stdin); ^ user.cpp:60:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("vis.out","w",stdout); ^ user.cpp:61:55: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d%d%d%d",&n,&k1,&k2,&l1,&c1,&l2,&c2); ^ user.cpp:64:35: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&val[i][j]); ^ user.cpp:82:29: warning: ‘cost4’ may be used uninitialized in this function [-Wmaybe-uninitialized] lee(l1,c1,cost4,0,1); ^ user.cpp:80:29: warning: ‘cost3’ may be used uninitialized in this function [-Wmaybe-uninitialized] lee(l2,c2,cost3,1,0); ^