Compilare: user.cpp: In function ‘void read()’: user.cpp:12:9: warning: unused variable ‘v’ [-Wunused-variable] int v; ^ user.cpp: In function ‘void royfloyd()’: user.cpp:25:56: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if((m[i][j]>m[i][k]+m[k][j]||m[i][j]==0&&i!=j)&&m[i][k]&&m[k][j]) ^ user.cpp: In function ‘void read()’: user.cpp:13:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:16:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&m[i][j]); ^ user.cpp: In function ‘int main()’: user.cpp:42:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("royfloyd.in","r",stdin); ^ user.cpp:43:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("royfloyd.out","w",stdout); ^