Compilare: user.cpp: In function ‘void Roy_Floyd(int (*)[105], int)’: user.cpp:12:117: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if(matrix[i][k] && matrix[k][j] && (matrix[i][j] > matrix[i][k] + matrix[k][j] || matrix[i][j] == 0 && i != j)) ^ user.cpp: In function ‘int main()’: user.cpp:28:37: 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:29:39: 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); ^