Compilare: user.cpp: In function ‘int main()’: user.cpp:3:14: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] #define INF 1<<30 ^ user.cpp:108:37: note: in expansion of macro ‘INF’ if(mat[i][j]==1) mat[i][j]=-INF-1; ^ user.cpp:72:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("lacuri.in","r",stdin); ^ user.cpp:73:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("lacuri.out","w",stdout); ^ user.cpp:77:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:80:45: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for(j=1;j<=n;++j) scanf("%d",&mat[i][j]); ^